GB875596A - Proteinaceous material and method of preparing same - Google Patents

Abstract

A non-gelling hydrolysed proteinaceous material is prepared by separating the material from an aqueous solution of the material formed by hydrolysis of collagen-containing matter by mixing the aqueous solution with a water-miscible precipitating agent in sufficient quantity to precipitate at least a major portion of the proteinaceous material and recovering the precipitated protein from the precipitating agent-water solution. The precipitating agent may be an aliphatic monohydric alcohol e.g. methyl, ethyl or isopropyl alcohol, a ketone of low molecular weight e.g. acetone or methyl ethyl ketone, or mixtures thereof, the alcohol being employed in a concentration in the range 80 to 95% alcohol. The mixing may be performed while the temperature is maintained between 0 DEG and 75 DEG F. and may be performed counter-currently under conditions such that the precipitated protein is washed. while settling, by fresh precipitating agent. The recovered precipitated protein is dissolved in water and the resulting solution is steam-stripped to remove traces of precipitating agent. The aqueous solution may be bleached with a bleaching agent capable of freeing nascent oxygen, prior to mixing the solution with the precipitating agent. The aqueous solution may be concentrated e.g. to between 45 and 75% dissolved solids by weight, prior to bleaching. The pH of the aqueous solution may be adjusted to an alkaline pH e.g. 8.0 to 12.3, and the aqueous solution may be heated e.g. at 85 DEG to 100 DEG C., for a time sufficient to destroy peroxidase e.g. 30 to 60 minutes prior to bleaching. The pH may be adjusted with ammonia, ammonium hydroxide, oxide, hydroxides or carbonates of alkali metals, or an oxide or hydroxide of an alkaline earth metal e.g. barium hydroxide or lime. The pH of the bleached solution may be adjusted to a pH less than 7 prior to mixing with the precipitating agent e.g. with an acid such as sulphuric, tartaric, or phosphoric acid, which forms a water-insoluble salt of alkaline earth metals, the precipitated insoluble salt being separated from the bleached aqueous solution prior to mixing with the precipitating agent. The separated solution may be concentrated to a solute content of between 30 and 60% by weight prior to mixing with the precipitating agent. The bleaching agent may be a peracid, sodium or barium peroxide, or hydrogen peroxide in a quantity of 5 to 11% by weight of protein solids, the solution being maintained at a temperature of 21 DEG to 95 DEG C. during bleaching.ALSO:A food adjunct which has foaming properties and is a non-gelling proteinaceous material is prepared from an aqueous solution formed by hydrolysis of collagen-containing matter by mixing the aqueous solution with a water-miscible precipitating agent, e.g. methanol, in sufficient quantity to precipitate at least a major portion of the proteinaceous material (see Group IV (b)). The material may be added to beer, and may be used in the preparation of frapp<\>aes, nougats, fudge, cream candies and cake frostings.