Extractation and Characteristics of Polysaccharides from Lotus Root Pomace

Abstract

Abstract: For comprehensive use of the pomace of lotus roots, water-soluble polysaccharides and insoluble dietary fibre were extracted and their characteristics were studied as well. Polysaccharides were obtained by hot-water extraction, ethanol precipitation, sevag method removing protein and then purificated by DEAE Sepharose Fast-flow, and NPh1 and NPh2 were fractioned. HPLC showed NPh2 was a pure acid polysaccharide with relative molecule weight more than 2000 kD that mainly composed of galactose, arabinose, rhamnose, glucose, fucose and xylose with molar ratio of 26.74: 16.17: 5.69: 5.49: 2.31:1. Dietary fibre being gained by alkaline hydrolyzation and decolored by H2O2, the yield was 26.97% and its water-holding capability and swelling power were 7.58 g/g and 9.0 ml/g, respectively. Results showed that lotus roots pomace can be a good source of water-soluble polysaccharides and insoluble dietary fibre.

Key words: lotus roots, pomace, polysaccharide, dietary fibre

YAN Lang, ZHANG Shu-Ming, ZHANG Fan-Hua, SHI Bao-Xia, LI Shu-Yan, LI Quan-Hong. Extractation and Characteristics of Polysaccharides from Lotus Root Pomace[J]. FOOD SCIENCE, 2007, 28(12): 226-230.

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Extractation and Characteristics of Polysaccharides from Lotus Root Pomace

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