FOOD SCIENCE ›› 2009, Vol. 30 ›› Issue (1): 25-27.doi: 10.7506/spkx1002-6630-200901004

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Structure Elucidation of Low Molecular Weight Pumpkin Polysaccharide LWPP-Ia

ZHANG Fan-hua,YAN Lang,ZHANG Shu-ming,SHI Bao-xia,LI Shu-yan,LI Quan-hong*   

  1. (College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China )
  • Received:2008-01-03 Online:2009-01-01 Published:2010-12-29
  • Contact: LI Quan-hong E-mail:liquanhong66@163.com

Abstract:

By means of periodate oxidation , Smith degradation , methylation, GC, GC-MS, the structure of low molecular weight polysaccharide, LWPP-Ia isolated from pumpkin was analyzed. Monosaccharide composition analysis of LWPP-Ia indicated hat it is a low branched molecule composed of glucose, fructose and galactose in the molar ratio of 3.6:1:1.2. The main chain is made up of (1 → 4)-linked-Glu and (1 → 4)-linked-Gal1 Some of (1 → 4)-linked-Glus were substituted at 2-O. The (1 → 2)- linked Glu is on the position 1 of side chain and the branch end is (1→)-Glu and (2→)- Fru.

Key words: pumpkin, polysaccharide, structure

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