Enzymatic food protein conversion and assessment of antioxidant activity of peptides

Soy proteins are among the various food proteins traditionally used for dietary correction and prevention of lipid metabolism disorders and associated cardiovascular diseases, obesity, arterial hypertension, and metabolic syndrome. The use of modern technologies for processing soy protein makes it possible to obtain hydrolysates that exhibit hypolipidemic, hypocholesterolemic and other properties. The most promising direction for the use of food protein hydrolysates is the development of low-allergenic prophylactic products. The aim of this study was to obtain an enzymatic hydrolysate of soy protein and to evaluate the antioxidant properties of the obtained peptides. The paper presents a 2-stage scheme for the enzymatic hydrolysis of soy protein using pepsin and trypsin, providing a high degree of hydrolysis (82-83 %). Fractionation of soybean hydrolysate made it possible to divide it into 3 main fractions (high, medium and low molecular weight). The total antioxidant activity of the obtained peptide fractions was determined. The average molecular fraction had the highest antioxidant activity, the total content of antioxidants in which was 71.2 ± 4.83 mg / 100 sm3. The search for peptides with hypoallergenic, immunomodulatory, and other properties will be of considerable interest in future studies. It is assumed that soy protein hydrolysate can be used as a functional ingredient of complex action in the composition of various specialized food products.