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Abstract
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Article Information:
Influence of Pretreatment on Cold Water Solubility and Esterification Activity of Starch
Jiaying Xin, Yan Wang and Tie Liu
Corresponding Author: Jiaying Xin
Submitted: July 21, 2012
Accepted: September 17, 2012
Published: October 20, 2012 |
Abstract:
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The aim of this study is to improve the Cold Water Solubility (CWS) and esterification activity of Native
corn Starch (NS) by pretreatment NS using NaOH/urea aqueous solution. The influence of pretreatment on granule
shape and crystal structure of corn starch was investigated by Scanning Electron Microscopy (SEM) and X-Ray
Diffraction (XRD). It has been found that the average particle size of Pretreatment corn Starch (PS) decreased to
nanometer level, smaller than those of NS (4-15 μm). XRD revealed that crystalline pattern of PS was VH-type,
which was different from that of NS (A-type). The maximum CWS of PS was 96.77%, while the NS was only 0.3%.
NS and PS were esterified with oleic acid catalyzed by lipase under the same conditions respectively. The effects of
the pretreatment on esterification activity of the corn starches were investigated by analyzing the Degrees of
Substitutions (DS) of the esterification products. The maximum DS of pretreatment starch oleate was 0.229, while
the DS of native starch oleate was very low and even could not be detected.
Key words: Cold water solubility, esterification activity, lipase, NaOH/urea aqueous solution, pretreatment starch, ,
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Cite this Reference:
Jiaying Xin, Yan Wang and Tie Liu, . Influence of Pretreatment on Cold Water Solubility and Esterification Activity of Starch. Advance Journal of Food Science and Technology, (5): 270-276.
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ISSN (Online): 2042-4876
ISSN (Print): 2042-4868 |
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