食品科学 ›› 2000, Vol. 21 ›› Issue (10): 15-18.

• 基础研究 • 上一篇    下一篇

银杏支链淀粉分子结构的研究

 敖自华, 王璋, 许时婴   

  1. 无锡轻工大学食品学院
  • 出版日期:2000-10-15 发布日期:2011-12-02

Sutdy on Molecular Structure of Ginkgo(Ginkgo biloba L.) Amylopectin

 AO  Zi-Hua, WANG  Zhang, XU  Shi-Ying   

  • Online:2000-10-15 Published:2011-12-02

摘要: 应用酶法研究了银杏支链淀粉的精细分子结构。结果显示银杏支链淀粉的平均链长、外链和内链长分别为25、17和7:用异淀粉酶和普鲁兰酶作用于银杏支链淀粉β-极限糊精,得到银杏支链淀粉的A、B链比值为1.68:1,分文化度为2.68。此结果也证实支链淀粉在生物体内的形成并非来源于糖原的前体物质。

关键词: 银杏, 支链淀粉, 结构, 分支化度

Abstract: The fine sturcture of amylopectin puritied from ginkgo (Ginkgo biloba L.)starch was studied by enzymic methods.The results showed that average chain length (CL),interior chain length(ICL) and exterior chain length (ECL) of the amylopectin were 25. 17 and 7,respectively.The O -amylase limit dextrins of amylopectin were completely debranched by joint action of isoamylase and pullulanase.From the reducing powers released by isoamylase acting (a) alone and (b) in conjunction with pullulanase A and B chains in the amylopectin were in the ratio of 1 .68:1 and the multiple branching degree was 2.68 .This result also confirmed that amylopectin could not be formed in vivo by debranching of a glycogen precusor as demonstrated by Marshall[3].

Key words: Ginkgo biloba L, amylopectin Structure Multiple branching degree