The effect of rye starch of different molar mass on the oxidation process, structural changes, radicals' formation
Sławomir Pietrzyk1, Angelika Wojtyś1, Joanna Sobolewska-Zielińska1
1Department of Food Analysis and Evaluation of Food Quality, University of Agriculture, Balicka 122, 30-149 Krakow, Poland.
Abstract:
The aim of work was to compare the susceptibility to oxidation of 3 rye starches of different molar mass. The comparison was done under standardized conditions and the properties of rye starches were also compared with commercial corn starch. Starches were oxidized by chlorate(I) sodium (10 g CI/kg starch). Rye starches exhibited lower susceptibility to oxidation (0.030-0.047 % COOH) compared to corn starch. The oxidation of high molar mass rye starch caused more distinct depolymerization of starch chains compared to rye starch of lower molar mass. In starches of low molar mass, depolymerization occurred mainly through the cleavage of the 1-4 glycosidic bond, whereas in high molar mass starch of degradation processes also the breaking of the 1-6 glycosidic bonds, limiting oxidation process at the C(6) atom of glucose. Rye starches showed higher stability of water binding capacity and viscosity of paste compared to corn starch, therefore they can be an alternative, good thickener for soup and sauces.
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