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Molecular properties of octenyl succinic esters of mechanically activated Indica rice starch
Author(s) -
Zhang Zhengmao,
Zhao Siming,
Xiong Shanbai
Publication year - 2013
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.201200187
Subject(s) - succinic anhydride , starch , gel permeation chromatography , chemistry , fourier transform infrared spectroscopy , chemical structure , nuclear magnetic resonance spectroscopy , proton nmr , residue (chemistry) , nuclear chemistry , organic chemistry , chromatography , polymer , chemical engineering , engineering
Indica rice starch was mechanically activated and then esterified by octenyl succinic anhydride (OSA). The molecular properties of the OSA‐starch were investigated by gel permeation chromatography, high performance size‐exclusion chromatography, FTIR spectroscopy, 1 H NMR, 13 C NMR spectroscopy. Modification by OSA could increase the molecular size or hydrodynamic volume of starch. As shown in FTIR spectrum of OSA‐starch, the relative intensity of characteristic peaks at 1724 and 1572/cm increased as the degree of substitution (DS) increased, which confirmed the esterification between OSA and starch. It can be concluded from the analysis of 1 H NMR, and 13 C NMR that the esterification between mechanically activated Indica rice starch and OSA should have occurred at 2‐OH, 3‐OH, and 6‐OH of glucose residue. As increasing DS decreased the relative intensity of the peak of chemical shift of 2‐OH in the 1 H NMR spectrum of OSA‐starch, 2‐OH was possible the main substitution position.