华南理工大学学报(自然科学版) ›› 2008, Vol. 36 ›› Issue (11): 68-73.

• 化学化工 • 上一篇    下一篇

木薯羧酸酯两性淀粉的制备与合成机理

罗明辉1  陆恩锡张本山2   

  1. 1. 华南理工大学 传热强化与过程节能教育部重点实验室, 广东 广州 510640; 2. 华南理工大学 轻工与食品学院, 广东 广州 510640
  • 收稿日期:2007-11-19 修回日期:2008-03-03 出版日期:2008-11-25 发布日期:2008-11-25
  • 通信作者: 罗明辉(1973-),男,博士生,主要从事工业淀粉的研究. E-mail:luomh2002@163.com
  • 作者简介:罗明辉(1973-),男,博士生,主要从事工业淀粉的研究.
  • 基金资助:

    国家科技支撑计划项目(2006BAD27804)

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)

摘要: 采用交联、氧化和醚化反应制备羧酸型两性淀粉,通过扫描电子显微镜、X射线衍射、胶体滴定等方法对该淀粉进行表征,并研究了该两性淀粉的合成机理.结果表明:该淀粉的阴、阳离子取代度分别达到0.018和0.033,50℃、6%该两性淀粉糊的黏度为258mPa·s;淀粉羧基离子与淀粉氧负离子存在竞争反应.文中还从微观角度阐明了这些改性反应并未影响淀粉的结晶结构.

关键词: 两性淀粉, 黏度, 羧基基团, 交联, 氧化

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