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13 C CP/MAS NMR Spectroscopy of Native and Acid Modified Starches
Author(s) -
Singh Vasudeva,
Ali S. Zakiuddin,
Divakar S.
Publication year - 1993
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19930450207
Subject(s) - dihedral angle , anomer , starch , chemistry , branching (polymer chemistry) , nuclear magnetic resonance spectroscopy , chemical shift , spectroscopy , crystallography , nuclear chemistry , stereochemistry , food science , molecule , organic chemistry , physics , hydrogen bond , quantum mechanics
13 CP/MAS 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 (HCI, HNO 3 ) modified 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 above modified starches led to narrowing of C 6 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 modified, was found to be different from other starches as inferred from the chemical shift values for their anomeric carbons and line shape. The dihedral angle (ϕ′2) calculated from chemical shift values for C 1 and conformation of dihedral angel (x) as predicted from chemical shift of C 6 are discussed with respect to structural organization.