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Optimization of reaction conditions for potato starch sulphate and its chemical and structural characterization

Potato starch sulphate (PSS) was synthesized by the reaction between potato starch and sulphuric acid in ethanol. In order to obtain the products with high degree of substitution (DS), the reaction conditions which could influence the DS were optimized, including $m_{{\rm St}} /V_{{\rm H}_{2} {\rm S...

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Bibliographic Details
Published in:Die Stärke 2011-06, Vol.63 (6), p.354-363
Main Authors: Cui, Dapeng, Liu, Mingzhu, Zhang, Bing, Gong, Honghong, Bi, Yinghui
Format: Article
Language:English
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Summary:Potato starch sulphate (PSS) was synthesized by the reaction between potato starch and sulphuric acid in ethanol. In order to obtain the products with high degree of substitution (DS), the reaction conditions which could influence the DS were optimized, including $m_{{\rm St}} /V_{{\rm H}_{2} {\rm SO}_{4} } $, $V_{{\rm EtOH}} /V_{{\rm H}_{{\rm 2}} {\rm SO}_{{\rm 4}} } $, water content in the reaction medium, the reaction temperature and reaction time in sulphation. In this process, the DS of each PSS sample was determined by barium sulphate-glutin nephelometery method. By investigating the relationship between these conditions and DS, the optimal conditions could be obtained with the maximum DS. Besides, the physical properties and chemical structure of PSS were studied, containing solubility, swelling power, FTIR spectra, XRD patterns, gelatinization temperatures and enthalpy measurements.
ISSN:0038-9056
1521-379X
DOI:10.1002/star.201000033