13C CP/MAS NMR spectroscopy of native and acid modified starches.

Vasudeva, Singh and Zakiuddin Ali, S. and Divakar, S. (1993) 13C CP/MAS NMR spectroscopy of native and acid modified starches. Starch/Staerke, 45 (2). 59-62 ; 12 ref..

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Abstract

13C CP/MAS [cross polarization magnetic angle spinning] NMR spectroscopic studies of some starches from cereals (wheat, maize and finger millet), pulses (green gram, chick pea), tuber (potato) and root (tapioca), and their respective acid (HCl, HNO3) modifed starches, were carried out. While cereal starches exhibited a triplet signal for their anomeric carbons, pulse, tuber and root starches showed doublets. Line width changes in signals indicated that debranching in the modified starches led to narrowing of C6 signals (more pronounced in the case of potato and tapioca starches) and were consistent with the release of branching strains. Potato starch, both native and modifed, was different from other starches as inferred from the chemical shift values for their anomeric carbons and line shape. The dihedral angle (phi'2) calculated from chemical shift values for C1 and conformation of dihedral angel (chi) as predicted from chemical shift of C6 are discussed with respect to structural organization.

Item Type:	Article
Uncontrolled Keywords:	ADDITIVES-; ANALYTICAL-TECHNIQUES; CARBOHYDRATES-; NUCLEAR-MAGNETIC-RESONANCE; STARCH-; ANALYSIS-; NMR-
Subjects:	500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 24 Organic Chemistry 500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 30 Starch Chemistry
Divisions:	Dept. of Biochemistry Grain Science and Technology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	30 May 2016 06:46
Last Modified:	30 May 2016 06:46
URI:	http://ir.cftri.res.in/id/eprint/7941

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