PREPARATION AND EVALUATION OF THE FUNCTIONAL PROPERTIES OF PROTEIN ISOLATES AND HY-DROLYSATES FROM PLANT RAW MATERIALS
UDC 664.76
Abstract
Animal protein plays a key role in the human diet as the most balanced amino acid composition; however, its consumption often causes allergic reactions. Plant protein serves as a substitute for animal protein. The most promising sources of plant protein are the seeds of cereals, pulses, oilseeds and cereals. Research aim: selection of conditions for obtaining protein isolates and enzymatic hydrolysates having the desired functional properties from different types of vegetable raw materials.Pea, corn and oat flour LLC "FavoritT"; linseed flour LLC NGO "Compass Health". Enzyme preparations: chymotrypsin LLC "Samson-Med"; Protex 40E Genencor; protosubtilin G3x produced by PO "Sibbiofarm" LLC; pancreatin PJSC "Biosintez"; trypsin LLC "Diaem"; beef pepsin OJSC "MHSF". Crude protein content was determined by Kjeldahl method, protein substances - by modified Lowry method. Fat-holding, water-holding, emulsifying and foaming capacities, as well as allergenicity of protein isolates and hydrolysates were determined. Conditions for protein substances extraction from flax, corn, oat and pea flour with the yield of high-molecular protein fraction not less than 70 % of raw protein content were selected. The conditions of protein isolates precipitation to produce preparations containing not less than 85% of protein have been selected. The type of enzyme preparation for hydrolysis - pancreatin - was selected. It was found that in order to increase water- and fat-holding capacity of pea isolate, hydrolysis is possible with duration not exceeding 15 min, for all other isolates hydrolysis is undesirable. The best emulsifying and foam-forming capacities are possessed by linseed hydrolysates after 60 and 90 min of hydrolysis, respectively. Enzymatic hydrolysis was shown to reduce the allergenicity of plant proteins. The obtained hydrolysates of vegetable proteins can be used as ingredients for functional products, as well as for obtaining products with reduced allergenicity.
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