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Assessment of the Extent of Starch Dissolution in Dimethyl Sulfoxide by 1 H NMR Spectroscopy
Author(s) -
Schmitz Sarah,
Dona Anthony C.,
Castignolles Patrice,
Gilbert Robert G.,
Gaborieau Marianne
Publication year - 2009
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200800244
Subject(s) - dissolution , starch , amylose , chemistry , dimethyl sulfoxide , nuclear magnetic resonance spectroscopy , maize starch , aqueous solution , homogeneous , nuclear chemistry , chromatography , organic chemistry , physics , thermodynamics
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.