Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (11): 68-73.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Preparation of Amphoteric Tapioca Carboxylic Ester Starch and Corresponding Mechanism

Luo Ming-hui1  Lu En-xi Zhang Ben-shan2    

  1.  1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. School of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2007-11-19 Revised:2008-03-03 Online:2008-11-25 Published:2008-11-25
  • Contact: 罗明辉(1973-),男,博士生,主要从事工业淀粉的研究. E-mail:luomh2002@163.com
  • About author:罗明辉(1973-),男,博士生,主要从事工业淀粉的研究.
  • Supported by:

    国家科技支撑计划项目(2006BAD27804)

Abstract:

Amphoteric tapioca starch with carboxyl groups was produced via crosslinking, oxidation and etherization reactions. The product was then characterized by means of SEM, XRD and colloid titration, with the preparation mechanism being also investigated. The results indicate that the degrees of substitution (DS) of carboxyl groups and quaternary ammonium groups respectively reach 0. 018 and 0. 033, that the viscosity of the product with a content of 6% is 258mPa· s at 50℃, and that there exists a competition between the carboxyl groups and the negative oxygen ions. It is also revealed from the viewpoint of micromechanism that the modification reactions has no effect on the crystalline structure of the starch.

Key words: amphoteric starch, viscosity, carboxyl group, crosslinking, oxidation