CN106866830A - A kind of method for improving Arabic gum emulsifiability - Google Patents

Abstract

A method for improving the emulsification performance of gum arabic, using gum arabic with poor emulsification performance as raw material, adopting esterification reaction, terminating the reaction, spray drying, removing residual octenyl succinic anhydride, storing and drying in a constant temperature and humidity box-oven, etc. technology to prepare gum arabic with high emulsifying properties. The present invention first adopts octenyl succinic anhydride-monoglyceride mixture to undergo esterification reaction with gum arabic, the introduction of octenyl succinic acid groups improves the emulsification performance of gum arabic, and the presence of monoglyceride has a positive impact on its emulsification performance , and shorten the reaction time, reduce production costs; secondly, use constant temperature and humidity box-oven to store and dry the gum arabic, and further improve its emulsifying performance through physical modification. The method does not use harmful organic solvents, has no environmental pollution, and is safe to operate, greatly improves the emulsifying performance of the gum arabic, and broadens its application range. This product is suitable for long-term stable emulsions, oil microcapsules, etc.

Description

A method for improving the emulsifying performance of latex arabic

technical field

The invention relates to a method for improving the emulsification performance of gum arabic, belonging to the technical fields of food, cosmetics, medicine and the like.

Background technique

Gum Arabic is a gum derived from the dried colloidal exudate secreted by the branches and trunks of the leguminous Acacia tree. It can be widely used in food, pharmaceutical, cosmetic and other industries. However, the properties of gum arabic, especially the emulsification, are difficult to achieve standardization. Different plant varieties, geographical and climate differences, post-harvest treatment, etc. will cause changes in its physical and chemical indicators. And compared with the usual protein emulsifiers, the concentration of gum arabic must be higher to achieve the emulsification effect. Therefore, modifying gum arabic to improve its application performance has gradually become a research hotspot.

At present, the commercialized gum arabic mainly comes from the Gemmiferace and Vulgares species of Acacia, among which Acacia senegal and Acacia seyal are the two species most used to collect gum arabic in Acacia. Gum Arabic derived from the Acacia seyal species (about 1/4 of commercial gum Arabic) generally has lower emulsifying properties than Acacia senegal . In addition, the resources of gum arabic with superior performance are facing depletion, and the output of products with real commercial value is very limited. Therefore, on the basis of maintaining the excellent properties of collagen arabic, it is necessary to improve the emulsifying properties of gum arabic derived from Acacia seyal species and reduce the amount of gum arabic used in industry.

There are many reports on the modification of gum arabic to improve its emulsification performance at home and abroad. The most common is physical modification, but the process often involves high temperature heating, which can easily cause browning, agglomeration, and coking of gum arabic. In addition, chemical modification is also a method to improve the emulsification performance of gum arabic, the most common one is to use octenyl succinic anhydride for modification. However, octenyl succinic anhydride is insoluble in water, and if used directly, the reaction efficiency will be low; if used in excess, its residual amount will increase, making it difficult to remove and increasing production costs.

Contents of the invention

The purpose of the present invention is to provide a method for improving the emulsification performance of latex arabic against the deficiencies of the prior art.

The technical scheme of the present invention is: through chemical-physical method, adopt octenyl succinic anhydride-monoglyceride mixture to carry out chemical modification to gum arabic, through constant temperature and humidity box-oven physical modification, thereby improve its emulsifying performance, for The modification of gum arabic provides a new method and idea, and then broadens its application scope; using gum arabic (derived from Acacia seyal species) as raw material, through esterification, spray drying, removal of residual octenyl succinic anhydride, constant temperature Constant humidity box-oven storage, drying and other technologies can improve the emulsification performance of gum arabic.

The method of the present invention is:

1. Preparation of gum arabic solution: Mix gum arabic with distilled water, stir and dissolve in a water bath at 50-60 °C, filter, and prepare a gum arabic solution with a mass concentration of 20%-40%.

2. pH adjustment of the gum arabic solution: adjust the initial pH of the gum arabic solution to 8.0 with 0.5 mol/L NaOH solution and 0.1 mol/L HCl solution.

3. Preparation of octenyl succinic anhydride-monoglyceride mixture: 3% octenyl succinic anhydride and 10% octenyl succinic anhydride monoglyceride at 60~70 °C Mix at a certain temperature to completely dissolve the monoglyceride to prepare an octenyl succinic anhydride-monoglyceride mixture.

4. Esterification reaction: place the gum arabic solution in a magnetic stirrer and stir at a temperature of 20-40 °C, slowly and evenly add the mixture of octenyl succinic anhydride-monoglyceride to the aqueous gum arabic solution, every Add the mixture dropwise once, use a high-speed shear disperser to disperse for 30 s, use 0.5 mol/L NaOH solution to adjust and keep the pH value of the reaction solution at 9.0, repeat the above steps, after 1-2 h of reaction, use 0.1 mol/L HCL solution Adjust the pH value of the reaction solution to 6.0 to terminate the reaction.

5. Spray-drying: Spray-dry the reaction-terminated solution under the conditions that the inlet and outlet air temperatures are 180°C and 90-95°C respectively, and the injection flow rate is 20 r/min.

6. Removal of residual octenyl succinic anhydride: use 95% ethanol to repeatedly wash and spray-dry the product for 3 to 5 times, and recover absolute ethanol after removing residual octenyl succinic anhydride.

7. Constant temperature and humidity box-oven storage, drying and washing of gum arabic: put the washed product in a constant temperature and humidity box, and store it at a temperature of 60 °C and a humidity of 75% for 12~24 hours. Transfer to an oven and dry at 60°C for 2 h to obtain the final product.

Features of this product: the present invention uses gum arabic (derived from Acacia seyal species) with relatively poor emulsifying properties as raw material, through the esterification reaction of monoglyceride-octenyl succinic anhydride and gum arabic, and spray drying to remove residual octenyl groups. Succinic anhydride is modified by constant temperature and humidity box-oven storage, drying and other technologies, which improves the reaction efficiency, reduces production costs, ensures product safety, and improves the emulsification performance of gum arabic at the same time, solving the problem of gum arabic emulsification performance unstable problem.

Beneficial effects of the present invention: use gum arabic (derived from Acacia seyal tree species) as raw material, modify it in combination with chemical and physical methods, improve the emulsification performance of gum arabic, and reduce the risk caused by differences in tree species, tree age, climate, etc. The difference in emulsifying properties increases the output of products with real commercial value and reduces its use in the food industry. At the same time, its application range has also been greatly expanded.

detailed description

Example 1

1. Preparation of gum arabic solution: weigh 100 g of gum arabic and mix it with distilled water, stir and dissolve in a water bath at 55 °C, filter, and prepare a gum arabic solution with a mass concentration of 20%.

2. pH adjustment of the gum arabic solution: adjust the initial pH of the gum arabic solution to 8.0 with 0.5 mol/L NaOH solution and 0.1 mol/L HCl solution.

3. Preparation of octenyl succinic anhydride-monoglyceride mixture: Add monoglyceride (0.3 g) to octenyl succinic anhydride (3 g). Completely dissolve monoglyceride at a temperature of 65°C to prepare octenyl succinic anhydride-monoglyceride mixture.

4. Esterification reaction: place the gum arabic solution in a magnetic stirrer and stir, and at a temperature of 20°C, slowly and evenly add the octenyl succinic anhydride-monoglyceride mixture to the aqueous gum arabic solution, each drop Add the mixture once and disperse for 30 s with a high-speed shear disperser. Use 0.5 mol/L NaOH solution to adjust and keep the pH value of the reaction solution at 9.0, repeat the above steps. After reacting for 1 h, the pH value of the reaction solution was adjusted to 6.0 with 0.1 mol/L HCl solution to terminate the reaction.

5. Spray-drying: Spray-dry the reaction-terminated liquid under the condition that the inlet and outlet air temperatures are 180°C and 90°C respectively, and the injection fluidity is 20 r/min.

6. Removal of residual octenyl succinic anhydride: use 95% ethanol to repeatedly wash and spray-dry the product 3 times, remove residual octenyl succinic anhydride, and recover absolute ethanol.

7. Constant temperature and humidity box-oven storage and drying of gum arabic after washing: place the washed product in a constant temperature and humidity box with a temperature of 60 °C and a humidity of 75% for 12 hours; then transfer to a temperature of 60 °C The final product was obtained after drying in an oven for 2 h.

Example 2

1. Preparation of gum arabic solution: weigh 100 g of gum arabic and mix it with distilled water, stir and dissolve in a water bath at 60 °C, filter, and prepare a gum arabic solution with a mass concentration of 30%.

2. pH adjustment of the gum arabic solution: adjust the initial pH of the gum arabic solution to 8.0 with 0.5 mol/L NaOH solution and 0.1 mol/L HCl solution.

3. Preparation of octenyl succinic anhydride-monoglyceride mixture: Add monoglyceride (0.3 g) to octenyl succinic anhydride (3 g), and completely dissolve the monoglyceride at a temperature of 65 °C to prepare octenyl Succinic anhydride-monoglyceride mixture.

4. Esterification reaction: place the gum arabic solution in a magnetic stirrer and stir, and at a temperature of 30 °C, slowly and evenly add the mixture of octenyl succinic anhydride-monoglyceride to the aqueous gum arabic solution, each drop Add the mixture once and disperse for 30 s with a high-speed shear disperser. Use 0.5 mol/L NaOH solution to adjust and keep the pH value of the reaction solution at 9.0, repeat the above steps. After reacting for 1.5 h, the pH value of the reaction solution was adjusted to 6.0 with 0.1 mol/L HCl solution to terminate the reaction.

5. Spray-drying: Spray-dry the reaction-terminated liquid under the condition that the inlet and outlet air temperatures are 180°C and 90°C respectively, and the injection fluidity is 20 r/min.

6. Removal of residual octenyl succinic anhydride: use 95% ethanol to repeatedly wash and spray-dry the product 4 times, remove residual octenyl succinic anhydride, and recover anhydrous ethanol.

7. Constant temperature and humidity box-oven storage and drying of the washed gum arabic: place the washed product in a constant temperature and humidity box with a temperature of 60 °C and a humidity of 75% for 24 hours; then transfer to a temperature of 60 °C The final product was obtained after drying in an oven for 2 h.

Example 3

1. Preparation of gum arabic solution: Mix 100 g of gum arabic with distilled water, stir and dissolve in a water bath at 60 °C, filter, and prepare a gum arabic solution with a mass concentration of 40%.

2. pH adjustment of the gum arabic solution: adjust the initial pH of the gum arabic solution to 8.0 with 0.5 mol/L NaOH solution and 0.1 mol/L HCl solution.

3. Preparation of octenyl succinic anhydride-monoglyceride mixture: Add monoglyceride (0.3 g) to octenyl succinic anhydride (3 g), and completely dissolve the monoglyceride at a temperature of 65 °C to prepare octenyl Succinic anhydride-monoglyceride mixture.

4. Esterification reaction: place the gum arabic solution in a magnetic stirrer and stir, and at a temperature of 40 °C, slowly and evenly add the octenyl succinic anhydride-monoglyceride mixture to the aqueous gum arabic solution, each drop Add the mixture once and disperse for 30 s with a high-speed shear disperser. Use 0.5 mol/L NaOH solution to adjust and keep the pH value of the reaction solution at 9.0, repeat the above steps. After 2 h of reaction, the pH value of the reaction solution was adjusted to 6.0 with 0.1 mol/L HCl solution to terminate the reaction.

5. Spray-drying: Spray-dry the reaction-terminated liquid under the condition that the inlet and outlet air temperatures are 180°C and 90°C respectively, and the injection fluidity is 20 r/min.

6. Removal of residual octenyl succinic anhydride: use 95% ethanol to repeatedly wash and spray-dry the product 5 times, remove residual octenyl succinic anhydride, and recover absolute ethanol.

7. Constant temperature and humidity box-oven storage and drying of the washed gum arabic: place the washed product in a constant temperature and humidity box with a temperature of 60 °C and a humidity of 75% for 24 hours; then transfer to a temperature of 60 °C The final product was obtained after drying in an oven for 2 h.

Claims (1)

1. it is a kind of improve Arabic gum emulsifiability method, it is characterized in that：

（1）It is prepared by gumwater：Weigh Arabic gum to mix with distilled water, dissolved in 50 ~ 60 DEG C of stirred in water bath, Filtering, prepares the gumwater that mass concentration is for 20% ~ 40%；

（2）Gumwater pH value is adjusted：I is adjusted using 0.5 mol/L NaOH solutions and 0.1 mol/L HCl solutions The initial pH value of primary sol solution is to 8.0；

（3）It is prepared by octenyl succinic acid anhydride-monoglyceride mixture：The 3% of Arabic gum butt quality octenyl succinic will be accounted for Acid anhydrides mixes with the monoglyceride of account for octenyl succinic acid anhydride quality 10% at a temperature of 60 ~ 70 DEG C, makes monoglyceride completely molten Solution, prepares octenyl succinic acid anhydride-monoglyceride mixture；

（4）Esterification：Gumwater is placed in magnetic stirring apparatus and is stirred, temperature is under the conditions of 20 ~ 40 DEG C, will Octenyl succinic acid anhydride-monoglyceride mixture is slow and is homogeneously added into the Arabic gum aqueous solution, and mixed once is often added dropwise Thing, 30 s are disperseed using high speed shear dispersion machine, and reacting liquid pH value is adjusted and kept with 0.5 mol/L NaOH solutions 9.0, Repeat the above steps, after 1 ~ 2 h of reaction, reacting liquid pH value to 6.0, terminating reaction is adjusted with 0.1 mol/L HCL solution；

（5）Spray drying：Reaction terminating liquid is respectively 180 DEG C and 90 ~ 95 DEG C in turnover air temperature, sample introduction mobility is 20 Under conditions of r/min, it is spray-dried；

（6）Except residual octenyl succinic acid anhydride：Using the product that obtains of 95% ethanol cyclic washing spray drying 3 ~ 5 times, remove residual After staying octenyl succinic acid anhydride, absolute ethyl alcohol is reclaimed；

（7）Arabic gum after climatic chamber-baking oven storage, dry washing：The product for obtaining will be washed and be placed on constant temperature and humidity In case, temperature be 60 DEG C, humidity be 75% under conditions of store 12 ~ 24 h after, be transferred in baking oven, temperature be 60 DEG C Under conditions of dry 2 h after obtain final products.