高等学校化学学报

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (4): 835.

• 研究论文 • 上一篇    下一篇

高碘酸钠氧化法测定羟丙基瓜尔胶上仲羟基取代度

叶应庆1, 丁彬1, 王克1, 何建平2, 崔俊杰2, 江波1   

    1. 四川大学化学学院, 成都 610064;
    2. 京昆油田科技开发公司, 昆山 215300
  • 收稿日期:2008-07-04 出版日期:2009-04-10 发布日期:2009-04-10
  • 通讯作者: 江波, E-mail:jiangbo@china.com

Determination of the Degree of Substitution at Secondary Hydroxyls of Hydroxypropyl Guar Gum by Periodate Oxidation

YE Ying-Qing1, DING Bin1, WANG Ke1, HE Jian-Ping2, CUI Jun-Jie2, JIANG Bo1*   

    1. College of Chemistry, Sichuan University, Chengdu 610064, China;
    2. Jingkun Oil Field Chemical Company, Kunshan 215300, China
  • Received:2008-07-04 Online:2009-04-10 Published:2009-04-10
  • Contact: JIANG Bo, E-mail:jiangbo@china.com

PDF (PC)

被引次数

5

摘要：

高碘酸钠氧化可以使邻羟基C—C键发生高选择性断裂, 同时产生两分子醛基. 在pH=4.3及25 ℃的条件下, 对瓜尔胶及其衍生物羟丙基瓜尔胶进行高碘酸钠氧化, 采用红外光谱与核磁共振谱对氧化产物结构进行了表征. 结果表明, 氧化后的瓜尔胶和及羟丙基瓜尔胶结构中醛基主要以半缩醛的形式存在. 通过测定高碘酸钠的消耗量得到不同摩尔取代度羟丙基瓜尔胶糖单元上邻羟基的含量, 结合概率分析方法, 确定摩尔取代度分别为0.04, 0.14, 0.36, 0.51, 0.78, 1.05和1.53的羟丙基瓜尔胶在仲羟基上取代度分别为0.02, 0.09, 0.18, 0.30, 0.46, 0.59和1.03, 与其它方法得到的结果一致.

关键词: 高碘酸钠; 瓜尔胶; 羟丙基瓜尔胶; 仲羟基取代度

Abstract:

Perioate oxidation of vicinal hydroxyls is a highly selective reaction which leads to the cleavage of the C—C bond and formation of dialdehyde groups. The reactions of periodate with guar gum(GG) and hydroxypropyl guar gum(HPG) were investigated at pH=4.3 and 25 ℃ and the oxidized products were characterized with IR and NMR. The results show that aldehyde groups in oxidized GG and HPG are in the form of hemiacetal structures like other polysaccharides such as starch and cellulose. The oxidation degree and the content of vicinal hydroxyls in GG and HPG were determined by the consumption of periodate(Pt) and the degree of substitution at the secondary hydroxyls(DSS—OH)of HPG was calculated by probability analysis. The results of HPGs with different molar substitution of 0.04, 0.14, 0.36, 0.51, 0.78, 1.05 and 1.53 are 0.02, 0.09, 0.18, 0.30, 0.46, 0.59 and 1.03 respectively, which are in good agreement with the values found in the literature by other methods. Other polysaccharides, such as methyl cellulose also gave good results on the values of by the method of periodate oxidation.

Key words: Sodium periodate; Guar gum; Hydroxypropyl guar gum; Degree of substitution of secondary hydroxyl

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