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Default The retrogradation properties of glutinous rice and buckwheat starches as observed with FT-IR, (13)C NMR and DSC.

The retrogradation properties of glutinous rice and buckwheat starches as observed with FT-IR, (13)C NMR and DSC.

Related Articles The retrogradation properties of glutinous rice and buckwheat starches as observed with FT-IR, (13)C NMR and DSC.

Int J Biol Macromol. 2013 Dec 17;

Authors: Xijun L, Changjun W, Kunsheng Z, Lin L

Abstract
The experiment was conducted to study the retrogradation properties of glutinous rice and buckwheat starch with wavelengths of maximum absorbance, FT-IR, (13)C NMR, and DSC. The results show that the starches in retrograded glutinous rice starch and glutinous rice amylopectin could not form double helix. The IR results show that protein inhabits in glutinous rice and maize starches in a different way and appearance of C-H symmetric stretching vibration at 2852cm(-1) in starch might be appearance of protein. Retrogradation untied the protein in glutinous amylopectin. Enthalpies of sweet potato and maize granules are higher than those of their retrograded starches. The (13)C NMR results show that retrogradation of those two starches leads to presence of ?-anomers and retrogradation might decompose lipids in glutinous rice amylopectin into small molecules. Glutinous rice starch was more inclined to retrogradation than buckwheat starch. The DSC results show that the second peak temperatures for retrograded glutinous rice and buckwheat starches should be assigned to protein. The SEM results show that an obvious layer structure exists in retrograded glutinous rice amylopectin.


PMID: 24360894 [PubMed - as supplied by publisher]



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