Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (15): 1525-1531. Previous Articles     Next Articles

Full Papers

苹果果胶活性寡聚半乳糖醛酸的分离制备及其ESI-MS分析研究

徐溪,李潇,黄琳娟,王仲孚   

  1. (西北大学生命科学学院 西北大学糖生物学与糖工程研究中心 西安 710069)
  • 投稿日期:2010-03-04 修回日期:2010-04-28 发布日期:2010-05-16
  • 通讯作者: 王仲孚 E-mail:wangzhfnwu@163.com
  • 基金资助:

    国家高技术研究发展计划;国家高技术研究发展计划;教育部新世纪优秀人才支持计划;陕西省重点实验室重点科研计划项目

Studies on Preparation of Oligogalacturonic Acids from Apple Pectin and Analysis by ESI-MS

XU Xi, LI Xiao, HUANG Lin-Juan, WANG Zhong-Fu   

  1. (Glycobiology and Glycotechnology Research Center, Life Science College, Northwest University, Xi an 710069)
  • Received:2010-03-04 Revised:2010-04-28 Published:2010-05-16

A low degree of esterification pectic acid was obtained by sodium hydroxide treatment of apple pectin. Pectic acid was depolymerized with a commercially available pectinase and a mixture of oligo-GalA (DP2-8) was pooled together, the mixture was separated by a low-pressure anion-exchange resin column chromatography to obtain pure oligo-GalA. The degradation conditions were optimized as enzymatic reaction at 40 ℃ for 1 h, oligo-GalA monomers in the range of 2~5 with a purity degree over 92% analyzed by TLC and ESI-MS were prepared (yield of 37%). The results indicated that there also existed dimer molecular ion peaks along with oligogalacturonic acid monomer molecular ion peaks, and the presence of the dimer were identified by ESI-MS/MS.

Key words: apple pectin, oligogalacturonic acid, anion-exchange resin, ESI-MS