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- W1983262057 abstract "Chemical modification of starch (substrate I) was effected through introduction of acrylonitrile or acrylamide moieties. The chemical modification reactions were carried out in such a way that each of these moieties is in the form of a group or a polymer. While cyanoethylated starch (substrate II) and carbamoylethylated starch (substrate IV) represent the moieties in the form of a group, poly (AN)-starch graft copolymer (substrate III) and poly (Aam)-starch graft copolymer (substrate V) represent them in the form of a polymer. The five substrates I–V were subjected to acid treatment (0.5 N and 1 N HCl) at 50 °C for different periods of time (15–60 min). Acid degradation was assessed by monitoring carboxyl and carbonyl contents, nitrogen content, apparent viscosity and film-forming properties. The carboxyl content, carbonyl content and apparent viscosity of the polyacrylonitrile and polyacrylamide starch copolymers as well as cyanoethylated and carbamoylethylated starches differ considerably among themselves as well as when compared with native starch. The latter seems to undergo hydrolytic/oxidative degradation during the chemical modifications via grafting, carbamoylethylation and cyanoethylation. Polyacrylamide starch copolymer acquires the highest resistance to acid hydrolysis whereas polyacrylonitrile starch copolymer acquires the least. On the other hand, cyanoethylated starch displays much greater resistance to acid hydrolysis than does carbamoylethylated starch. Meanwhile the resistance of polyacrylamide starch copolymer exceeds that of cyanoethylated starch when the decrease in nitrogen content of these modified starches after acid hydrolysis is taken as a measure. A different situation is encountered when the resistance to acid hydrolysis was judged from decrease in apparent viscosity. This reflects the contribution of the nature of the moiety beside its form in determining the stability of the modified starch to acid attack." @default.
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- W1983262057 date "1998-11-01" @default.
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- W1983262057 title "Behaviour of starch bearing nitrogen-containing moieties towards acid degradation" @default.
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- W1983262057 doi "https://doi.org/10.1016/s0141-3910(97)00070-0" @default.
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