Process for producing a soy protein hydrolysate
AssigneeFuji Oil Company, Limited
InventorsKazunobu Tsumura, Wataru Kugimiya, Kumiko Hoshino
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Abstract
The present invention provides a soy protein hydrolysate with a low content of glycinin wherein glycinin as a major component in soybean protein is selectively decomposed and a process for producing the same. The soy protein hydrolysate with a low content glycinin is obtained by allowing a proteolytic enzyme to act on soy protein to selectively decompose glycinin in the soybean protein, and the process for producing a soy protein hydrolysate with a low content of glycinin comprises allowing a proteolytic enzyme to act on soy protein at pH 1.0 to 2.8, preferably pH 1.5 to 2.5.
Claims12
A process for producing a soy protein hydrolysate with a low content of glycinin comprising:
- obtaining from low-denatured de-fatted soy flakes, having a nitrogen solubility index (NSI) of 60 or more, a soybean protein isolate comprising glycinin and .beta.-conglycinin without thermal denaturization;
- contacting an aqueous suspension of the isolate with pepsin at a concentration of about 0.001% to about 0.5% by weight of the isolate in the suspension at a pH in the range from about 1.0 to about 2.8 and at a temperature in the range from about 20.degree. C. to about 50.degree. C. to obtain a soy protein hydrolysate;
- and
- neutralizing the hydrolysate,
- whereby the degree of decomposition of glycinin is 60% or more and that of .beta.-conglycinin is 40% or less.
A process for producing a soy protein hydrolysate with a low content of .beta.-conglycinin comprising:
- obtaining from low-denatured de-fatted soy flakes, having a nitrogen solubility index (NSI) of 60 or more, a soybean protein isolate comprising .beta.-conglycinin and glycinin without thermal denaturization;
- contacting an aqueous suspension of the isolate with pepsin at a concentration of about 0.001% to about 0.5% by weight of the isolate in the suspension at an acidic pH, and at a temperature in the range from more than 50.degree. C. to less than 90.degree. C.,
- whereby the ratio of glycinin to .beta.-conglycinin is 1.5 or more by weight, and the ratio of trichloroacetic acid soluble protein to the whole protein is from about 5% to 20% by weight in the pepsin treated product.
Dependencies are inferred from the claim text.