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Assessment of the Extent of Starch Dissolution in Dimethyl Sulfoxide by 1H NMR Spectroscopy

✍ Scribed by Sarah Schmitz; Anthony C. Dona; Patrice Castignolles; Robert G. Gilbert; Marianne Gaborieau

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 281 KB
Volume: 9
Category: Article
ISSN: 1616-5187
DOI: 10.1002/mabi.200800244

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Complete dissolution is needed for the separation, characterization, or homogeneous labeling of whole starch molecules. A method is presented to quantify the extent of starch dissolution in DMSO for the first time; it is validated on a commercial rice starch. It is used directly on starch dispersions containing possible undissolved or co‐dissolved species. High‐amylose maize starches, known to be digested slowly in vivo, only quantitatively dissolve in the presence of high concentrations of an H‐bond disrupter, LiBr, although they form clear dispersions at low LiBr concentrations. Starch quantitatively dissolves from waxy rice flours; non‐starch components partially co‐dissolve but do not interfere with the dissolution quantification.

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