Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (2): 32-38.doi: 10.3969/j.issn.1000-565X.2010.02.007

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Performance of Carboxymethyl Starch Paste and Factors Affecting Paste Transparency

Zhong Zhen-sheng  Sun Ang   

  1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-04-30 Revised:2009-07-22 Online:2010-02-25 Published:2010-02-25
  • Contact: 钟振声（1955-），男，副教授，主要从事有机精细化学品的合成、提取和分析表征研究． E-mail:chszhong@seut．edu．cn
  • About author:钟振声（1955-），男，副教授，主要从事有机精细化学品的合成、提取和分析表征研究．
  • Supported by:

    广东省国际科技合作计划项目（B15B2071080）

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Abstract:

Carboxymethyl starch （CMS） with a degree of substitution （DS） of 0. 8901 and with a transparency of 89. 2% was synthesized from potato starch, with ethanol as the solvent. Then, the structure and morphology of potato starch and CMS were characterized by means of FT-IR and ESEM, and the effects of synthesis factors on the transparency of the CMS paste were analyzed. The results indicate that （ 1 ） the transparency of CMS paste is influenced by both the DS and the etherification uniformity; （2） after the carboxymethylation, the transparency of CMS paste increases by 53.8% and the freeze-thaw stability as well as the storage stability improves; （3） the transparency of CMS paste changes slightly in alkaline condition but gradually descends with the increase of acidity ; （4） as for the acid-resistant performance, the CMS with high DS is superior to that with low DS; and （5） as for the influences of food additives, sodium chloride and citric acid both reduce the paste transparency, while glucose and sucrose have an opposite effect.

Key words: carboxymethyl starch, starch paste, transparency, degree of substitution, potato starch