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US20070207244A1 - Methods of separating fat from non-soy plant materials and compositions produced therefrom - Google Patents

Methods of separating fat from non-soy plant materials and compositions produced therefrom Download PDF

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Publication number
US20070207244A1
US20070207244A1 US11/681,217 US68121707A US2007207244A1 US 20070207244 A1 US20070207244 A1 US 20070207244A1 US 68121707 A US68121707 A US 68121707A US 2007207244 A1 US2007207244 A1 US 2007207244A1
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Prior art keywords
fat
reduced
extract
protein
soy plant
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Abandoned
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US11/681,217
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English (en)
Inventor
Donald L. Crank
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SPECIALTY PROTEIN PRODUCERS Inc
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SPECIALTY PROTEIN PRODUCERS Inc
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Priority to US11/681,217 priority Critical patent/US20070207244A1/en
Assigned to SPECIALTY PROTEIN PRODUCERS, INC. reassignment SPECIALTY PROTEIN PRODUCERS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CRANK, DONALD L.
Publication of US20070207244A1 publication Critical patent/US20070207244A1/en
Priority to US13/154,054 priority patent/US20110293804A1/en
Priority to US13/543,405 priority patent/US10555542B2/en
Priority to US16/352,253 priority patent/US12193452B2/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING OR TREATMENT THEREOF
    • A23C11/00—Milk substitutes, e.g. coffee whitener compositions
    • A23C11/02—Milk substitutes, e.g. coffee whitener compositions containing at least one non-milk component as source of fats or proteins
    • A23C11/10—Milk substitutes, e.g. coffee whitener compositions containing at least one non-milk component as source of fats or proteins containing or not lactose but no other milk components as source of fats, carbohydrates or proteins
    • A23C11/103—Milk substitutes, e.g. coffee whitener compositions containing at least one non-milk component as source of fats or proteins containing or not lactose but no other milk components as source of fats, carbohydrates or proteins containing only proteins from pulses, oilseeds or nuts, e.g. nut milk
    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21D—TREATMENT OF FLOUR OR DOUGH FOR BAKING, e.g. BY ADDITION OF MATERIALS; BAKING; BAKERY PRODUCTS
    • A21D13/00—Finished or partly finished bakery products
    • A21D13/06—Products with modified nutritive value, e.g. with modified starch content
    • A21D13/064—Products with modified nutritive value, e.g. with modified starch content with modified protein content
    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21D—TREATMENT OF FLOUR OR DOUGH FOR BAKING, e.g. BY ADDITION OF MATERIALS; BAKING; BAKERY PRODUCTS
    • A21D2/00—Treatment of flour or dough by adding materials thereto before or during baking
    • A21D2/08—Treatment of flour or dough by adding materials thereto before or during baking by adding organic substances
    • A21D2/24—Organic nitrogen compounds
    • A21D2/26—Proteins
    • A21D2/264—Vegetable proteins
    • A21D2/266—Vegetable proteins from leguminous or other vegetable seeds; from press-cake or oil bearing seeds
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING OR TREATMENT THEREOF
    • A23C11/00—Milk substitutes, e.g. coffee whitener compositions
    • A23C11/02—Milk substitutes, e.g. coffee whitener compositions containing at least one non-milk component as source of fats or proteins
    • A23C11/06—Milk substitutes, e.g. coffee whitener compositions containing at least one non-milk component as source of fats or proteins containing non-milk proteins
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING OR TREATMENT THEREOF
    • A23C20/00—Cheese substitutes
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING OR TREATMENT THEREOF
    • A23C9/00—Milk preparations; Milk powder or milk powder preparations
    • A23C9/12—Fermented milk preparations; Treatment using microorganisms or enzymes
    • A23C9/13—Fermented milk preparations; Treatment using microorganisms or enzymes using additives
    • A23C9/133—Fruit or vegetables
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
    • A23G1/00—Cocoa; Cocoa products, e.g. chocolate; Substitutes therefor
    • A23G1/30—Cocoa products, e.g. chocolate; Substitutes therefor
    • A23G1/32—Cocoa products, e.g. chocolate; Substitutes therefor characterised by the composition containing organic or inorganic compounds
    • A23G1/44—Cocoa products, e.g. chocolate; Substitutes therefor characterised by the composition containing organic or inorganic compounds containing peptides or proteins
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
    • A23G9/00—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor
    • A23G9/32—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor characterised by the composition containing organic or inorganic compounds
    • A23G9/38—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor characterised by the composition containing organic or inorganic compounds containing peptides or proteins
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
    • A23J1/00—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites
    • A23J1/006—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites from vegetable materials
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
    • A23J1/00—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites
    • A23J1/006—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites from vegetable materials
    • A23J1/007—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites from vegetable materials from leafy vegetables, e.g. alfalfa, clover, grass
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
    • A23J1/00—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites
    • A23J1/12—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites from cereals, wheat, bran, or molasses
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
    • A23J1/00—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites
    • A23J1/14—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites from leguminous or other vegetable seeds; from press-cake or oil-bearing seeds
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L11/00—Pulses, i.e. fruits of leguminous plants, for production of food; Products from legumes; Preparation or treatment thereof
    • A23L11/05—Mashed or comminuted pulses or legumes; Products made therefrom
    • A23L11/07—Soya beans, e.g. oil-extracted soya bean flakes
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L11/00—Pulses, i.e. fruits of leguminous plants, for production of food; Products from legumes; Preparation or treatment thereof
    • A23L11/60—Drinks from legumes, e.g. lupine drinks
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L13/00—Meat products; Meat meal; Preparation or treatment thereof
    • A23L13/40—Meat products; Meat meal; Preparation or treatment thereof containing additives
    • A23L13/42—Additives other than enzymes or microorganisms in meat products or meat meals
    • A23L13/426—Addition of proteins, carbohydrates or fibrous material from vegetable origin other than sugars or sugar alcohols
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L13/00—Meat products; Meat meal; Preparation or treatment thereof
    • A23L13/60—Comminuted or emulsified meat products, e.g. sausages; Reformed meat from comminuted meat product
    • A23L13/65—Sausages
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L13/00—Meat products; Meat meal; Preparation or treatment thereof
    • A23L13/60—Comminuted or emulsified meat products, e.g. sausages; Reformed meat from comminuted meat product
    • A23L13/67—Reformed meat products other than sausages
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L17/00—Food-from-the-sea products; Fish products; Fish meal; Fish-egg substitutes; Preparation or treatment thereof
    • A23L17/70—Comminuted, e.g. emulsified, fish products; Processed products therefrom such as pastes, reformed or compressed products
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Preparation or treatment thereof
    • A23L2/385—Concentrates of non-alcoholic beverages
    • A23L2/39—Dry compositions
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Preparation or treatment thereof
    • A23L2/52—Adding ingredients
    • A23L2/66—Proteins
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
    • A23L33/17—Amino acids, peptides or proteins
    • A23L33/185—Vegetable proteins
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • A23L33/40—Complete food formulations for specific consumer groups or specific purposes, e.g. infant formula
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L7/00—Cereal-derived products; Malt products; Preparation or treatment thereof
    • A23L7/10—Cereal-derived products
    • A23L7/117—Flakes or other shapes of ready-to-eat type; Semi-finished or partly-finished products therefor
    • A23L7/126—Snacks or the like obtained by binding, shaping or compacting together cereal grains or cereal pieces, e.g. cereal bars
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B1/00—Production of fats or fatty oils from raw materials
    • C11B1/12—Production of fats or fatty oils from raw materials by melting out
    • C11B1/14—Production of fats or fatty oils from raw materials by melting out with hot water or aqueous solutions

Definitions

  • Plant materials are processed to produce a wide variety of food products including oils and plant-derived proteins.
  • consumer demand for low- or reduced-fat, high protein plant-derived products has increased dramatically.
  • consumer demand for natural, organic and environmentally friendly or “green” food products and plant-derived nutraceuticals are currently used commercially to produce plant-based oils, proteins and other plant-based products for use in food production, including solvent extraction and a variety of press-based methods, e.g., extruder, expeller, continuous, and cold presses.
  • press-based methods can be used to produce foods that may be certified organic.
  • One particular type of press-based method is used commercially to produce organic plant protein products and organic plant-derived oils. Oil recovery from the extruder press method is relatively inefficient and a fairly high percentage of fat remains in the cake. Commercially available partially defatted cakes and flour produced by the extruder press method are characterized by poor protein solubility and reduced protein functionality.
  • the present invention provides a method of processing a non-soy plant material.
  • a plant material is aqueously extracted to produce an extract, which is centrifugally separated into a fat-enriched fraction and a reduced-fat extract.
  • the fat-enriched fraction may optionally be further processed to produce an oil.
  • the reduced-fat extract may optionally be further processed to produce an evaporated or spray dried product.
  • the reduced-fat extract may be concentrated to produce a reduced-fat plant protein composition.
  • the reduced-fat extract may optionally be contacted with an acid in an amount effective to produce a first curd and whey.
  • the curd is then separated from the whey to produce a first reduced-fat plant protein composition.
  • the first reduced-fat plant protein composition may be washed to produce a second reduced-fat plant protein composition.
  • the reduced-fat extract may be subjected to filtration to produce a first reduced-fat plant protein composition.
  • the resulting first reduced-fat plant protein composition may be subjected to a further round of filtration to obtain a second reduced-fat plant protein composition.
  • a fat-enriched fraction a reduced-fat plant extract, a reduced-fat plant protein composition having at least 65% dry weight protein, a reduced-fat plant protein composition having at least 85% dry weight protein, a crude oil, plant gums, a degummed oil, and a protein-fat sediment produced according to the methods described herein.
  • Food products containing the various plant compositions are also provided.
  • FIG. 1 is a schematic flow diagram showing a method of fractionating plant material to produce plant-based milk. Dashed lines represent alternative or optional steps in the process.
  • FIG. 2 is a schematic flow diagram showing a method of fractionating plant material to produce a reduced-fat plant protein and a fat fraction using acid precipitation. Dashed lines represent alternative or optional steps in the process.
  • FIG. 3 is a schematic flow diagram showing a method of fractionating plant material to produce a reduced-fat plant protein and a fat fraction using ultrafiltration and/or diafiltration. Dashed lines represent alternative or optional steps in the process.
  • FIG. 4 is a schematic flow diagram showing a method of processing a fat-enriched fraction to produce plant gums, oils and fats. Dashed lines represent alternative or optional steps in the process.
  • the present invention provides methods for fractionating non-soy plant materials by aqueously extracting the plant material and centrifugally separating the aqueous extract to produce a fat-enriched fraction (or “cream”) and a reduced-fat extract.
  • the aqueously extracted plant material is centrifugally separated based on the differential densities of the materials to form a relatively high density reduced-fat fraction (the reduced-fat extract) and a relatively low density fat-enriched fraction.
  • the reduced-fat extract has an increased protein to fat ratio as compared to the starting plant material.
  • the fat-enriched fraction and the reduced-fat extract can be further processed to obtain a variety of products having desirable characteristics. As shown in the Examples, the methods described herein may be used to remove 60% or more of the fat from full fat plant materials.
  • the reduced-fat extract prepared according to the methods may be used to produce a reduced-fat plant milk having at least about 50% protein and about 15% or less fat, or it may be further processed to make reduced-fat plant protein compositions.
  • the reduced-fat plant protein compositions may contain at least 65% dry basis protein (a protein concentrate) or may contain at least 90% dry basis protein (a protein isolate).
  • the fat-enriched fraction can be further processed to produce oils, soaps and gums (including lecithin-like emulsifiers).
  • a protein-fat sediment comprising fiber and enriched in phospholipids may be obtained.
  • FIGS. 1-4 diagram how plant materials may be processed to obtain various compositions useful in the manufacture of a variety of food products and nutraceuticals.
  • non-soy plant material comprising protein and fat.
  • non-soy plant materials useful in the methods of invention include, but are not limited to, canola (rapeseed), castor bean, cottonseed, flaxseed, palm kernel, linseed, candlenut, sesame seed, peanut, coconut, corn, corn germ, sunflower, safflower, oats, chia, kukui, pumpkin, walnut, grape, primrose, rice bran, almond, olive, avocado, beech, brazil, pecan, pistachio, hickory, filbert, macadamia, cashew, neem, hemp, lupin, coffee, poppy, pepper, mustard seed, wheat and wheat germ.
  • any suitable non-soy plant material may be used in the method of the invention, provided that aqueous extraction of the plant material yields an aqueous extract comprising fat capable of being removed by centrifugation.
  • the plant materials include, but are not limited to, natively grown plants, traditional crop grown plants, non-GMO (genetically modified organism) plants, GMO plants and organically grown plants.
  • the plant materials used may be substantially full fat plant materials, i.e. plant materials that have not been defatted prior to milling.
  • the plant material can be partially defatted by any suitable method.
  • a partially defatted plant material includes any plant material from which at least a portion of the fat has been removed.
  • Methods of obtaining a partially defatted plant material include, but are not limited to screw press, extruder press, cold press, high pressure liquid extraction using e.g., carbon dioxide, nitrogen, or propane and supercritical fluid fat extraction.
  • the partially defatted cakes thus produced are optionally milled into partially defatted flour prior to aqueous extraction and centrifugal fat separation.
  • Flour, flakes, cakes, grits and meals for use in the centrifugal fat separation methods are commercially available.
  • full fat flour was used as the starting material.
  • Substantially full fat plant materials may have a fat content of 10% or more fat by weight.
  • the fat content of a substantially full fat plant material is at least about 15%, 20%, 30%, 40% or even 50% by weight.
  • the fat content of a partially defatted plant material may be greater than about 5%, 10% or 15% fat by weight.
  • the plant material used in the methods can be prepared for processing by any suitable means, including but not limited to, drying, conditioning to achieve an equilibrated moisture level, dehulling, cracking, and cleaning to remove trash, weeds, hulls or other undesirable material from the plant material by counter current air aspiration, screening methods or other methods known in the art.
  • the plant materials are optionally further processed by milling using any suitable means including grinding, but not limited to, using a hammer mill, rollermill or a screw-type mill.
  • the resulting flour can have a variety of particle sizes. Suitably 40 to 1000 mesh flour is used for extraction, more suitably 100 to 600 mesh flour is used, but any suitable flour, flake, grit, meal or cake may be used.
  • aqueous solution includes water substantially free of solutes (e.g., tap water, distilled water or deionized water) and water containing solutes.
  • the aqueous solution may contain additives such as salts, buffers, acids and bases. Fat separation can be effected by the described methods without requiring the addition of demulsifiers; suitably the aqueous solution is substantially free of demulsifiers.
  • Aqueous solutions substantially free of demulsifiers include those containing about 0.01% or less demulsifier by weight.
  • the aqueous solution contains about 0.005% or less, or more suitably about 0.001% or less demulsifier by weight.
  • the aqueous solution has an ionic strength of about 0.10 N or less, more suitably about 0.07 N, 0.05 N or 0.02 N or less.
  • the extraction temperature may be between about 32° F. and about 200° F., suitably from about 32° F. to about 150° F., more suitably between about 80° F. and about 150° F., more suitably between about 90° F. and about 145° F. and even more suitably between about 110° F. and 140° F. Products having different functional characteristics may be obtained by including additives or varying the extraction temperature.
  • water is added to the flour in a ratio of about 4 to about 16 parts by weight to each part of plant material. However, more or less water may be used.
  • the pH was adjusted by adding a base, such as calcium hydroxide, to facilitate extraction of the proteins.
  • Other bases may be added to adjust the pH, including but not limited to, sodium hydroxide, ammonium hydroxide, and potassium hydroxide.
  • the pH is adjusted to between about 6.0 and about 10.5, even more suitably the pH is adjusted to between about 7.0 and about 9.0 to optimize extraction.
  • the pH is greater than about 7.0 and more suitably the pH is about 7.5.
  • the extraction may be conducted with or without agitation for a period of time effective to extract protein.
  • the extraction is conducted for at least 10 minutes, and more suitably extraction is conducted for at least 30 minutes, 1 hour, 2 hours, or 4 hours. As one of skill in the art will appreciate, longer extraction periods may be used.
  • the extract may be separated from at least a portion of the insoluble by-product (e.g., insoluble fiber fraction) prior to fat removal by centrifugation. This may be accomplished using horizontal decanters, disk-type desludgers, disk-type clarifiers, or similar machines to separate liquids and solids. In the Examples, a disk-type clarifying centrifuge was utilized to remove the insoluble by-product prior to centrifugal fat separation.
  • the insoluble fiber fraction may be used for animal feed, or further processed and dried for use as an animal or human food ingredient.
  • the insoluble fiber fraction can be washed by adding aqueous solution to the insoluble by-product and centrifuging as above.
  • a disk-type clarifying centrifuge may optionally be used to remove residual insoluble fiber fraction.
  • the resulting extract can then be subjected to centrifugal fat separation as detailed below.
  • fat globules In general, relatively large, low density fat globules can be separated from the aqueous extract by centrifugal fat separation more completely than smaller, higher density fat globules. Fat globule size may be affected by the preparation of the plant material and the by the extraction conditions. Centrifugal fat separation may be improved by preparing the extract in a way that maintains the density differential between the fat globules and the water in the aqueous extract.
  • Centrifugal separation of fat may be enhanced by minimizing mechanical treatments, minimizing storage time and exposure to heat of plant materials prior to fat separation, storing and processing raw materials as whole, undamaged plant material until close to time of use, minimizing exposure to air after initial processing, minimizing microbial growth in the aqueous extract, minimizing foam generation in aqueous extract, minimizing air entrainment in the aqueous extract, selecting processing conditions and heat treatments which do not increase the free fatty acid content of the aqueous extract, eliminating treatments that promote emulsification, and maintaining the pH of the extract above about 6.0.
  • at least about 40%, 50%, 60%, 70%, 80%, or 90% of the fat is removed from the reduced-fat extract after centrifugal separation.
  • Centrifugal separation of the aqueous extract may be accomplished by any suitable method and can be performed as a batch, semi-continuous or continuous process.
  • the aqueous plant extract may be delivered to a continuous disk-type separator operated under conditions that allow separation of at least a portion of the fat from the remaining extract.
  • the separator may be configured either with a solid bowl or with a continuous or intermittent solids discharge design. The disk angles and the disk spacing may be altered as well.
  • a continuous discharge, disk-type, two-phase solid bowl separator such as model MP-1254 from Westfalia Separator Industries (Oelde, Germany) is used.
  • a three-phase separator such as model MRPX-418 HGV from Westfalia Separator Industries (Oelde, Germany), may be used.
  • Use of a three phase separator allows simultaneous separation of insoluble by-products (e.g., insoluble fiber fraction) from the reduced-fat plant extract and the fat-enriched fraction.
  • At least a portion of the insoluble fiber fraction is removed from the aqueous extract by centrifugation prior to centrifugal separation of the fat-enriched fraction from the reduced-fat extract as described above. Preferably some fiber remains in the extract.
  • a three phase separator may then be used to form a reduced-fat extract, a fat-enriched fraction and a sediment containing protein, fat and fiber (protein-fat sediment).
  • the resulting protein-fat sediment has a unique composition, is enriched in phospholipids and may be useful in production of food products or nutraceuticals.
  • the percentage of fat removed from the plant extract can be varied by altering the specific parameters used for centrifugal separation consistent with Stokes law.
  • the efficiency of fat removal can be affected by altering the feed rate of the extract into the separator (time) or the g-force applied by the separator (angular velocity).
  • Centrifugal fat separation may result in about a 2 fold increase in the protein to fat ratio of the reduced-fat extract as compared to the extract prior to centrifugal fat separation.
  • the protein to fat ratio increase is about 3 fold, 4 fold or more.
  • the centrifugal fat separation process may remove at least about 40% of the fat content of the extract by weight.
  • the centrifugal fat separation process may remove about 60%, 70% or even more of the fat by weight from the extract.
  • the reduced-fat extract produced by the methods suitably has a 3 to 1 protein to fat ratio.
  • the protein to fat ratio is more suitably about 4 to 1, 5 to 1, 6 to 1, 8 to 1, 10 to 1 or even 12:1.
  • the relative amount of fat removed from the extract can also be affected by altering the preparation of the extract.
  • the milling process, extraction and handling of the plant material may affect the amount of fat removed by centrifugal fat separation.
  • the efficiency of fat separation can be altered by changing the preparation methods in a variety of ways including, but not limited to, altering the density of the plant extract, the extraction temperature or the size of fat globules in the extract. While any temperature may be used for centrifugal fat separation, a temperature between about 120° F. and about 180° F. is suitable. More suitably, a temperature between about 120° F. and about 150° F. is utilized.
  • the fat-enriched fraction (or cream) and the reduced-fat extract (reduced-fat plant milk) can be further processed to produce reduced-fat plant protein products and plant-derived oils.
  • the fat-enriched fraction may be cooled and stored in refrigerated tanks for use as a food ingredient in other applications or further processed to remove at least a portion of the water to produce plant-derived oils and gums using methods known in the art. (See Erickson, et al. 1980. Handbook of Soy Oil Processing and Utilization, American Soybean Association and the American Oil Chemists Society, St. Louis, Mo. and Champaign, Ill.
  • the reduced-fat extract can be used as reduced-fat plant milk or be further processed to produce protein concentrate or protein isolate using methods known in the art. (See Zerki Berk, 1992. Technology of Production of Edible Flours and Protein Products from Soybeans, Food and Agriculture Organization of the United Nations Agriculture Services Bulletin No. 97, Haifa, Israel, incorporated herein by reference in its entirety.)
  • the resulting reduced-fat plant extract can be used to produce a low fat or nonfat plant milk product as diagrammed in FIG. 1 .
  • the reduced-fat plant milk may be consumed as a liquid or may be used to manufacture numerous food products.
  • the solids concentration or pH may be adjusted, additives can be included, or reduced-fat extract may be subjected to further processing to create specific reduced-fat plant extract products.
  • the food products include, but are not limited to, plant milk beverages, yogurt, or other products with functional properties advantageous for a specific food product application as discussed below.
  • a portion of the fat-enriched fraction can be added to the reduced-fat extract to produce plant extracts having a precise protein to fat ratio.
  • the reduced-fat plant extract could have fat added to produce a low-fat, rather than a nonfat product.
  • the reduced-fat plant extract may be condensed in an evaporator, or may be spray dried to produce a reduced-fat plant extract powder.
  • the reduced-fat plant extract may also be used in a variety of food products.
  • the plant milk product may be designated as either low fat or nonfat depending on the ratio of protein to fat in the plant milk.
  • Low fat plant milk can be produced by removing enough fat from the plant extract, or alternatively adding fat back to the reduced-fat plant extract, so that the protein to fat ratio is at least 4 to 1 (w/w).
  • These reduced-fat plant milk products contain at least 55% protein on a dry solids basis and 15% or less dry weight acid hydrolyzed fat.
  • Suitably reduced-fat plant milk products contain at most 10% dry weight acid hydrolyzed fat and at least 60% dry weight protein. More suitably the protein to fat ratio of reduced-fat plant milk is 6 to 1 (w/w) or higher.
  • the amount of fat removed by centrifugal fat separation can be altered by adjusting the parameters of the fat separation method to produce fat free or nonfat plant milk by centrifugally removing additional fat so that the ratio of protein to fat in fat free milk is at least 12 to 1 (w/w).
  • a reduced-fat extract may optionally be further processed to make reduced-fat plant protein compositions by concentration and separation methods known in the art, such as acid precipitation of the proteins and filtration, including e.g. ultrafiltration, microfiltration or diafiltration. These methods can be used to produce plant protein compositions that are organic certifiable.
  • the protein compositions produced may be a concentrate, containing at least 65% protein on a dry weight basis, or an isolate, containing at least 90% protein on a dry weight basis, depending on the specific process used and the starting materials.
  • the final protein compositions contain at least about 65%, 75%, 85% or 90% protein on a dry weight basis.
  • the final protein products may comprise a protein to fat ratio of at least about 5 to 1 (w/w) and optionally a protein to fat ratio of about 8 to 1, about 10 to 1 or even about 12 to 1 (w/w) or higher.
  • the reduced-fat plant protein compositions may contain about 15% or less dry weight fat and suitably contain about 10% or even about 7% or less dry weight fat.
  • proteins in the reduced-fat extract were concentrated by precipitation and separated, as diagrammed in FIG. 2 , to produce a plant protein concentrate or isolate from partially defatted plant material.
  • proteins in the reduced-fat extract can be precipitated by adding acid, such as citric acid, to the isoelectric point of the protein. Any suitable acid may be used.
  • the precipitated protein (“first curd”) can be separated from the first whey in a continuous horizontal decanter, disk-type clarifier, or disk-type desludger, such as the disk-type clarifying centrifuge model SB-7 available from Westfalia Separator Industries (Oelde, Germany) used in the Examples below.
  • the separated first curd constitutes the first reduced-fat plant protein composition.
  • the first plant protein compositions produced in the Examples were washed by adding an aqueous solution to the first plant protein composition and centrifuging to produce second plant protein compositions with higher concentrations of protein.
  • the reduced-fat extract may be concentrated and separated by other methods known to those of skill in the art, such as filtration, as diagrammed in FIG. 3 , to produce plant protein compositions from plant material.
  • This process includes passing the reduced-fat extract through a microporous filtration membrane system to produce a protein-rich retentate.
  • the protein-rich retentate from filtration (first reduced-fat plant protein composition) may be modified and dried to a powder to produce a dried plant protein composition, or further processed in a second stage filtration process.
  • the second retentate constitutes the second reduced-fat plant protein composition.
  • Plant protein concentrate and isolate may be used by persons skilled in the art to make numerous products.
  • the solids concentration and pH may be adjusted or the reaction conditions altered to produce protein products with different functional characteristics.
  • various additives may be included or procedures performed using the concentrates and isolates to create specific products with functional properties advantageous for a particular application.
  • a portion of the fat-enriched fraction can be added to the plant protein composition to adjust the protein to fat ratio.
  • the plant concentrates and isolates prepared by the methods may be used to manufacture many different types of products.
  • the resulting plant protein isolate or concentrate can be dried to a free flowing powder in a spray drier, flash drier, or other similar food grade drying system known to those of skill in the art.
  • the products produced by this method are expected to have increased functionality as compared to organic certifiable plant protein products currently available (e.g., those produced by hot press methods) because plant materials that have not been exposed to high heat environments can be used as starting materials. Additionally, the resulting products will not contain the undesirable contaminants associated with hexane or alcohol extracted plant materials.
  • These products may have desirable functional properties associated with plant material protein concentrates and isolates.
  • the following functional properties will be evaluated for the reduced-fat non-soy plant proteins made with centrifugal fat separation as compared to currently available plant protein compositions: surface hydrophobicity, water binding ability, fat binding, emulsification, gel hardness and deformability, solution particle size, solubility, dispersibility, whippability, viscosity, color and taste as well as others.
  • Reduced-fat plant protein compositions of the present invention suitably have a substantially bland taste and an off-white color such that their use in production of a food product will not negatively affect the taste or color of the food product.
  • the resulting plant protein compositions may also contain enhanced levels of beneficial microconstituents, such as phospholipids, saponins, tocopherols and sterols.
  • hemp protein supplies enough of each of the essential amino acids to contribute to the human body's requirements.
  • An important aspect of hemp protein is that it is a quality source of the amino acids arginine and histidine and of the sulphur-containing amino acids methionine and cysteine.
  • Hemp protein also contains relatively high levels of the branched-chain amino acids that are crucial in the repair and growth of lean body mass. Almost two-thirds of hemp protein is made up of edestin, a globulin protein found only in hemp seeds. Edestin is a type of plant protein that is similar to proteins found in the human body.
  • hemp's protein is albumin, another high quality, low molecular weight globulin protein that is also found in egg whites. Due to the low viscosity, high protein content, bland flavor, nutritional value of the amino acids, and molecular weight profile of the hemp protein composition, this would be an excellent protein source for nutritional bars and nutritional beverages. For example the very low viscosity demonstrated for the hemp protein compositions demonstrated in Example 10 would be advantageous in liquid and dry blend beverages, milk replacers, infant formula, whole muscle meat injection products and the like.
  • Reduced-fat plant extracts and reduced-fat plant protein compositions can be used to make a wide variety of food products.
  • These food products include, but are not limited to, confectionary products, bakery products, injection meat products, emulsified meat products, ground meat products, meat analog products, cereals, cereal bars, dairy analog products, beverages, plant-based milk, liquid or powdered dietetic formula, texturized plant products, pasta, health nutrition supplements, and nutrition bars.
  • a confectionary product may include, but is not limited to, candy or chocolate.
  • a bakery product may include, but is not limited to, breads, rolls, biscuits, cakes, yeast baked goods, cookies, pastries, or snack cakes.
  • An injection meat product includes, but is not limited to ham, poultry product, turkey product, chicken product, seafood product, pork product or beef product.
  • An emulsified meat product includes, but is not limited to sausage, bratwurst, salami, bologna, lunchmeat, or hot dogs.
  • a ground meat product includes, but is not limited to fish sticks, meat patties, meatballs, ground pork products, ground poultry products, ground seafood product or ground beef products.
  • a meat analog product includes, but is not limited to sausages, patties, ground meatless crumbles, lunchmeat or hot dogs.
  • a dairy analog product includes, but is not limited to milk products, yogurt products, sour cream products, whipped topping, ice cream, cheese, shakes, coffee whitener or cream products.
  • a dietetic formula includes, but is not limited to infant formula, geriatric formula, weight loss preparations, weight gain preparations, sports drinks, or diabetes management preparations.
  • a number of ready to drink beverages may be produced using the protein compositions described herein as a partial or complete protein source.
  • Persons skilled in the art may modify the type and content of proteins, sugar sources, fats and oils, vitamin/mineral blends, flavors, gums, and/or flavors to produce a beverage product designed to meet specific nutritional requirements, product marketing claims, or targeted demographic groups.
  • nutritional bars may be produced using the non-soy plant protein compositions as a partial or complete protein source.
  • the fat-enriched fraction (or cream) can be processed into a crude oil by removal of at least a portion of the water from the fat-enriched fraction.
  • the resulting crude oil is expected to have increased functionality and microconstituent content as compared to other crude oil preparations currently available.
  • the free fatty acids value of the crude oil, as well as any oils produced from the crude oil, is generally lower than similar oils produced from hot pressed soy materials.
  • the free fatty acids value of the oils may be measured by the standard method as described in Example 7.
  • the crude oil may be further processed by methods known to those of skill in the art to produce a variety of compositions.
  • the first step in processing (i.e. refining) the fat-enriched fraction includes removal of phospholipids and hydratable phosphatides (“degumming”) by addition of an acid and centrifugal separation of the resulting gums.
  • the resulting gums may be analyzed for their phospholipids and mineral content.
  • the content of several minerals including Mg, Ca, Na, Fe, K, P and Cl may be evaluated in the gums as well as in the crude oil and the degummed oil using standard methods such as the following: AOAC 18 th Ed.
  • Plant gums may be further purified and used in foods and food products as an emulsifier, stabilizer, anti-spattering agent, dough improver, anti-staling agent and antioxidant.
  • plant gums may be used to promote solidity in margarine and to give consistent texture to dressings, sauces and other creamy products.
  • Plant gums may also be used in bakery products, chocolates, instant food powders and other food product applications.
  • the degummed oil may be further refined to remove free fatty acids.
  • Crude edible oils frequently contain undesirable amounts of free fatty acids that affect their quality.
  • the term “free fatty acids” (FFA) is used to distinguish fatty acids that are not chemically bound to glycerol molecules as carboxylic esters. FFAs are more prone to oxidation than esterified fatty acids and hence can predispose fats and oils to oxidative rancidity characterized by off-flavor described as “bitter.” Fats and oils, when pure, consist almost entirely of the esters of fatty acids and glycerol. “Fats” are solid at room temperature and “oils” are liquid at room temperature. As fats and oils are used in cooking, they tend to break down, degrade, and hydrolyze to free fatty acids, glycerol, and other polar materials. The free fatty acids are among the harmful products of this degradation.
  • the fatty acid composition, the total saturated and the total unsaturated fat in the various cream samples may also be determined.
  • Fat and fatty acids are extracted by hydrolytic methods; the fat is extracted into ether, saponified, and then methylated to fatty acid methyl esters (FAMES).
  • FAMES are quantitatively measured by capillary gas chromatography. The procedure is based on the two following official methods: (1) AOAC 18 th Edition, Method 996.06 , Fat ( Total, Saturated and Unsaturated ) in Foods, 2001, and (2) AOCS, 5 th Ed., Method Ce 2-66 , Preparation of Methyl Esters of Fatty Acids, 199, each of which is incorporated by reference in its entirety.
  • the refined oil fraction may then be bleached by treatment with solid absorbents such as activated carbon that may then be removed by filtration.
  • Deodorization very commonly used in the fats and oils industry to remove odorous substances from the crude oil, may be accomplished by steam distillation of heated oil under a high vacuum. The deodorization process removes simultaneously the FFAs, fat-soluble vitamins (A, E, D, and K), mono-glycerides, sterols, and some pigments such as carotenoids. Deodorization also strips off the aroma and flavors of fats and oils resulting in a bland finished product. The free fatty acid content for edible fats and oils is a key factor in the quality, flavor, and odor of those fats and oils.
  • the resulting refined, bleached and deodorized (RBD) oils can be used as salad or cooking oil and also in a variety of food product applications as would be apparent to those of skill in the art.
  • the dry basis protein and fat ratios were measured by standard methods.
  • the protein content of the soy materials was determined using the Kjeldahl method (AOAC 18th Ed. Method 991.2.2, Total Nitrogen in Milk, 1994, which is incorporated herein by reference in its entirety). Briefly, samples were digested using acid, catalyst and heat. The digested sample was made alkaline with the addition of sodium hydroxide. Steam was then used to distill the sample, releasing ammonia. The ammonia was collected in a receiving vessel and was back titrated with a standardized acid solution. The nitrogen content was then calculated. The protein content is the nitrogen content multiplied by a protein factor. The protein factor used for soy materials is 6.25.
  • the fat content of the soy materials was determined gravimetrically. Briefly, the sample was weighed into a Mojonnier flask. Acid was added and the sample heated until the solids were broken down. The sample was cooled and then extracted using alcohol, ethyl ether and pet ether. The flask was centrifuged and the resulting ether/fat layer was poured off into a pre-weighed aluminum dish. Samples were subjected to a series of 2 or 3 extractions depending on the fat level. The ether was evaporated and placed in an oven to dry. The sample was cooled in a desiccator and then weighed as described in the Official Method of Analysis AOAC 922.06 , Fat in Flour which is incorporated herein by reference in its entirety.
  • the total solids present in the soy material were determined gravimetrically using standard procedures. Briefly, the sample was weighed and placed in an oven at a specific temperature for a specific time. Time and temperature were dependant on the sample type. For powder samples, a vacuum oven set at 100° C. for 5 hours was used. The sample was removed from the oven and cooled in a desiccator. The cooled sample was weighed and the total solids/moisture was calculated as describe in official methods of analysis, Association of Official Analytical Chemists ( AOAC ), 18 th Edition 927.05 , Moisture in Dried Milk which is incorporated herein by reference in its entirety.
  • the extract was heated to 130° F. and delivered to a high g-force continuous discharge, disk-type separator (model MP-1254, Westfalia Separator Industry GmbH, Oelde, Germany) for separation of the fat-enriched cream fraction.
  • the separator was fed at a rate of 14 pounds per minute, separating the fat-enriched fraction from the reduced-fat extract. Eighty nine point seven percent of the fat in the extract was removed.
  • the reduced-fat extract contained a protein to fat ratio of 7.7 to 1 with a proximate analysis of 51.1% Kjeldahl dry basis protein and 6.7% dry basis acid hydrolyzed fat.
  • the fat-enriched canola fraction also known as canola cream had a composition as identified in Table 4, and was further processed as described in Example 7.
  • Raw sunflower kernels were obtained from Dakota Gourmet (SunOpta, Wahpeton, N. Dak.). The raw sunflower kernels were ground with a grinding mill (All-Grain-Company model A-22, Brigham City, Utah) to produce 60 mesh sunflower flour. The sunflower flour had proximate analysis of 4.7% moisture, 27.6% dry basis Kjeldahl protein, 54.5% dry basis acid hydrolyzed fat and a 0.50 to 1 protein to fat ratio.
  • the extract was reheated to 140° F. and delivered to a high g-force continuous discharge, disk-type separator (model MP-1254, Westfalia Separator Industry GmbH, Oelde, Germany) for separation of the fat-enriched sunflower cream fraction.
  • the separator was fed at a rate of 14 pounds per minute, separating the fat-enriched fraction, also known as sunflower cream from the reduced-fat extract. Seventy six percent of the fat in the extract was removed.
  • the reduced-fat extract contained a protein to fat ratio of 3.5 to 1.
  • the reduced-fat extract had a proximate value of 48.5% Kjeldahl dry basis protein and 13.7% dry basis acid hydrolyzed fat.
  • the fat-enriched fraction, also known as sunflower cream had a composition as identified in Table 4, and was further processed as described in Example 7.
  • the reduced-fat extract was then precipitated by adding 129 grams of citric acid powder (Citric Acid, Anhydrous FCC grade, Xena International, Inc., Polo, Ill.) to a pH of 4.0 in an agitated tank at 130° F. The mixture was held for 15 minutes with mild agitation, and then fed continuously to in a Sharples P-660 decanting centrifuge (Alfa Laval Separation Inc., Warminster, Pa.). Seven point seven pounds of the first protein composition solids was recovered with 76.0% dry basis Kjeldahl protein, 17.5% dry basis acid hydrolyzed fat and a protein to fat ratio of 4.3 to 1.
  • citric acid powder Citric Acid, Anhydrous FCC grade, Xena International, Inc., Polo, Ill.
  • Milled hemp seeds were obtained from Manitoba Harvest, Winnipeg, Manitoba, Canada and the milled hemp seeds contained 5.8% moisture, 33.4% dry basis Kjeldahl protein, 45.1% dry basis acid hydrolyzed fat and a 0.74 to 1 protein to fat ratio.
  • the hemp seed was mixed with 320 pounds of water at 125° F. in a 50 gallon agitated tank.
  • the hemp slurry was continuously recirculated from the tank to a colloid mill and back into the tank at a rate of 5 gallons per minute for 30 minutes to wet mill the seeds.
  • One hundred sixty pounds of additional water was added to the slurry, and the pH of the extraction slurry was adjusted to 7.5 with the addition of a 10% solution of sodium hydroxide (50% solution, Fisher Scientific, Barnstead International, Dubuque, Iowa).
  • the diluted slurry was held for a mean time of 20 minutes.
  • the extract was separated from the insoluble by-product using a high g-force, disk-type clarifying centrifuge (model SB-7, Westfalia Separator Industry GmbH, Oelde, Germany) at an extract flow rate of 3.3 to 6.6 pounds per minute with intermittent solids discharge of 2 second duration on a 7 minute cycle. Twenty one point eight pounds of insoluble by-product was collected and discarded at 27.25% solids, 30.9% Kjeldahl dry basis protein.
  • the extract was heated to 130° F. and delivered to a high g-force continuous discharge, disk-type separator (model MP-1254, Westfalia Separator Industry GmbH, Oelde, Germany) for separation of the fat-enriched hemp cream fraction.
  • the separator was fed at a rate of 12 pounds per minute, separating the fat-enriched fraction from the reduced-fat extract. Ninety four point nine percent of the fat in the extract was removed.
  • the reduced-fat extract contained a protein to fat ratio of 9.5 to 1, and had a proximate value of 79.0% Kjeldahl dry basis protein and 8.3% dry basis acid hydrolyzed fat.
  • the fat-enriched fraction also known as hemp cream had a composition as identified in Table 4, and was further processed as described in Example 7.
  • the reduced-fat extract was then precipitated by adding citric acid powder to a pH of 4.4 in an agitated tank at 130° F. The mixture was held for 30 minutes with mild agitation, and then fed continuously to a high g-force disk-type clarifying centrifuge (model SB-7, Westfalia Separator Industry GmbH, Oelde, Germany). Seven point four pounds of first protein composition was recovered with 91.6% dry basis Kjeldahl protein, 11.0% dry basis acid hydrolyzed fat and a protein to fat ratio of 8.3 to 1.
  • the second protein composition was modified by adjusting the solids level to 10.1% with fresh water at 90° F., and adjusting the pH to 6.8 with a 10% solution of sodium hydroxide.
  • the neutralized slurry was then spray dried in a NIRO (Hudson, Wis.) model 1 spray-drier with 200° C. inlet and 92° C. outlet to produce a hemp protein isolate powder with 3.6% moisture.
  • the hemp protein isolate powder was analyzed for its functional properties as described in Examples 9 and 10.
  • Raw sunflower kernels were obtained from Dakota Gourmet (SunOpta, Wahpeton, N. Dak.). The raw sunflower kernels were ground with a grinding mill (All-Grain-Company model A-22, Brigham City, Utah) into a 100 mesh sunflower flour. The sunflower flour had proximate analysis of 4.4% moisture, 27.3% dry basis Kjeldahl protein, 57.7% dry basis acid hydrolyzed fat and a 0.47 to 1 protein to fat ratio.
  • the extract was reheated to 130° F. delivered to a milk centrifugal separator (Hemdhenu Ekectric cream separator type KD-60E, India) for separating the fat-enriched fraction from the reduced-fat extract. Seventy three percent of the fat in the extract was removed in the sunflower cream.
  • the reduced-fat extract contained a protein to fat ratio of 8.5 to 1 with a 69.0% Kjeldahl dry basis protein and 8.1% dry basis acid hydrolyzed fat.
  • the reduced-fat extract was precipitated by adding a 50% citric acid solution to a pH of 4.0 in an agitated beaker at 140° F. The mixture was held for ten minutes with mild agitation, and then centrifuged as identified in this Example to separate the curd (precipitated protein) from the whey.
  • the recovered curd also known as the first plant protein composition, represented a sunflower protein concentrate with 84.8% dry basis Kjeldahl protein and 9.7% dry basis acid hydrolyzed fat.
  • the protein to fat ratio of the first protein composition was 8.7 to 1.
  • Full fat peanut meal was obtained from American Health & Nutrition (Misc. # ZPEMAHN6).
  • the peanut meal had proximate analysis of 4.92% moisture, 31.5% dry basis Kjeldahl protein, 49.5% dry basis acid hydrolyzed fat and a 0.63 to 1 protein to fat ratio.
  • the extract was reheated to 160° F. delivered to a milk centrifugal separator identified in Example 4 for separating the peanut cream (fat-enriched fraction) from the reduced-fat extract. Eighty percent of the fat in the extract was removed in the peanut cream.
  • the reduced-fat extract contained a protein to fat ratio of 7.0 to 1 with a 78.7% Kjeldahl dry basis protein and 11.2% dry basis acid hydrolyzed fat.
  • the fat-enriched fraction, also known as peanut cream had a composition as identified in Example 7.
  • the reduced-fat extract was precipitated by adding a 50% citric acid solution to a pH of 4.4 in an agitated beaker at 140° F. The mixture was held for ten minutes with mild agitation, and then centrifuge as in Example 4 to separate the curd (precipitated protein) from the whey.
  • the recovered curd also known as the first plant protein composition, represented a peanut protein isolate with 90% dry basis Kjeldahl protein and 8% dry basis acid hydrolyzed fat.
  • the protein to fat ratio of the first protein composition was 11.25 to 1.
  • Full fat sesame meal was obtained from American Health & Nutrition (Misc. # ZSMMAHN6).
  • the sesame meal had proximate analysis of 5.0% moisture, 28.4% dry basis Kjeldahl protein, 51.5% dry basis acid hydrolyzed fat and a 0.55 to 1 protein to fat ratio.
  • the extract was reheated to 160° F. delivered to a milk centrifugal separator as identified in Example 4 for separating the sesame cream (fat-enriched fraction) from the reduced-fat extract. Seventy seven percent of the fat in the extract was removed in the sesame cream producing a reduced-fat extract.
  • the reduced-fat extract contained a protein to fat ratio of 2.8 to 1 with a 45.9% Kjeldahl dry basis protein and 16.5% dry basis acid hydrolyzed fat.
  • the fat-enriched fraction, also known as sesame cream had a composition as identified in Examples 7 and 8.
  • the reduced-fat extract was precipitated by adding a 50% citric acid solution to a pH of 4.4 in an agitated beaker at 140° F. The mixture was held for ten minutes with mild agitation, and then centrifuged as in Example 4 to separate the curd (precipitated protein) from the whey.
  • the recovered curd also known as the first plant protein composition, represented a rich sesame protein product with 62% dry basis Kjeldahl protein and 0% dry basis acid hydrolyzed fat.
  • the protein to fat ratio of the first protein composition was 62 to 1.
  • the separated whey of the sesame was surprisingly high in residual fat content, and the protein compositions had almost no fat.
  • Three fat-enriched cream fractions from Examples 1, 2, and 3 were collected from the fat separation process.
  • the cream samples were then freeze dried to a powder in an FTS Systems Dura-Top bulk tray freeze drier for 48 hours to produce a crude oil by removing the water.
  • the freeze dried crude oil was heated to 158° F. and agitated. Two percent of a five percent citric acid solution was added to the agitated freeze-dried crude oil for additional mixing of 15 minutes.
  • the hydratable phospholipids and gums were then removed by centrifugation at 4000 rpm for 10 minutes, and the oil was filtered over filter paper.
  • the degummed oils and the gums fractions (lecithin) were then analyzed for their chemical compositions as delineated below.
  • the free fatty acid value indicates the amount of hydrolytic rancidity that has occurred in a fat based on the two following official methods of analysis: (1) AOAC method 41.1.21 and (2) Official Methods and Recommended Practices of the American Oil Chemists Society, 5th Ed., Method Ca 5a-40 each of which is incorporated herein by reference in their entirety.
  • Hydrolytic rancidity is caused by enzyme hydrolysis of fats into free fatty acids and glycerol. The test involves dissolving a fat sample in organic solvent and titrating with sodium hydroxide. Free fatty acid can be expressed in terms of an acid value instead of percent free fatty acids. The acid value is defined as mg of potassium hydroxide (KOH) necessary to neutralize one gram of sample. To convert percent free fatty acids (as oleic) to an acid value, multiply the percent free fatty acids by 1.99.
  • the mineral content of the crude oil, the degummed oil and the gums was determined using standard methods such as the following: AOAC 18 th Ed. Method 985.35 , Minerals in ready to Feed Milk Based Infant Formula, 1997 , Standard Methods for the Examination of Water & Waste Water, Method 3111 , Metals by Atomic Absorption Spectrophotometry, 1999, and AACC 10 th Ed. Method 40-71 , Sodium and Potassium by Atomic Absorption Spectrophotometry, 1999 each of which is incorporated herein by reference in its entirety.
  • the levels of acetone insoluble matter present in the soy gums were determined using the following method.
  • the gums were warmed briefly at a temperature not exceeding 60° C. and then mixed. Two grams were transferred to a 40-mL centrifuge tube and 15.0 mL of acetone was added. The resulting sample was warmed in a water bath with stirring to melt the gums completely and then placed in an ice-water bath for 5 minutes. Acetone chilled to between 0° and 5° C. was then added to the 40-mL mark on the centrifuge tube with stirring. The tube was then incubated in an ice-water bath for 15 minutes, stirred, and centrifuged at 2000 rpm for 5 minutes. The supernatant was decanted and the pellet broken up.
  • the centrifuge tube was then refilled with chilled acetone to the 40 mL mark while stirring. After incubation in an ice-water bath for 15 minutes, the tube was centrifuged again, the supernatant was decanted and the remaining acetone was allowed to evaporate. The tube containing the acetone-insoluble residue was heated to 105° C. and the weight of the acetone insoluble residue determined. The percentage of acetone-insoluble matter can then be calculated by comparison to the starting weight.
  • the oil fractions of these processes may be refined, bleached, deodorized, winterized, or undergo any further processing to purify the oil from the fat-enriched fraction.
  • the precipitated gums can be used as a feed additive, or evaporated to remove moisture.
  • the gums have various uses such as a food emulsifier.
  • Creams obtained from Examples 1 through 6 were analyzed for their composition including a fatty acid profile as shown in the table below.
  • the fatty acid composition, the total saturated and the total unsaturated fat in the various cream samples was determined using standard methods. Fat and fatty acids were extracted by hydrolytic methods; the fat was extracted into ether, saponified, and then methylated to fatty acid methyl esters (FAMES). FAMES were then quantitatively measured by capillary gas chromatography.
  • the fat separation process removed 76% to 95% of the fat present in the extract in all grains tested, and the cream samples contained a cream composition of 90% to 97% fat.
  • the cream sample fatty acid profiles are very similar in composition to the data reported in American Oil Chemists Society publication Official Methods and Recommended Practices of the AOCS, Physical and Chemical Characteristics of Oils, Fats, and Waxes, 2nd Edition for oil from the same seed source.
  • the viscosity of the soy protein material was determined by an RVA viscosity analysis in 20% slurry solution, using a Rapid Visco Analyzer (RVA).
  • the 20% solution is prepared by mixing the soy protein materials with water at 25° C. using a Combimax 600 food processor (Braun Boston, Ma) for a period of time sufficient to permit the formation of a shiny, smooth slurry. Twenty-five grams of the homogenous solution was then placed into a canister with a paddle and delivered into a Rapid Visco Analyzer (RVA—4, Newport Scientific Pty Ltd, Warriewood, Australia).
  • the RVA was used to continuously measure the apparent viscosity of the slurry.
  • the total test time in the RVA was 17 minutes and 30 seconds.
  • the slurry was held at 25° C. for the first three minutes followed by heating to 95° C. over the next 4 minutes.
  • the slurry was held at 95° C. for 2 minutes and 30 seconds and then cooled back to 25° C. over the next 6 minutes and finally held at 25° C. for 2 more minutes.
  • the slurry was mixed at 160 rpm. From the apparent viscosity curve three points were determined for comparison tests.
  • the minimum cold viscosity of the sample describes the minimum initial viscosity at 25° C.
  • the minimum hot viscosity describes the minimum viscosity at 95° C.
  • the maximum set-up viscosity describes the peak viscosity after cooling the sample back to 25° C.
  • Hemp protein isolate produced in Example 3 was analyzed by the RVA procedure, and a soy protein isolate for low viscosity applications available from Solae (Supro 590, St. Louis, Mo.) was used for comparison purposes. The results are shown in Table 6.
  • the hemp protein isolate has significantly lower viscosities than the commercial product marketed for product applications where low viscosity is desired such as in liquid and dry blend beverages.

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