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Purification and Characterization of Bioflocculant Producing from $Lactobacillus$ $jensenii$ YW-33  

Seo, Ho-Chan (Department of Brain Education, University of Brain Education)
Publication Information
Korean Journal of Environmental Biology / v.29, no.4, 2011 , pp. 305-311 More about this Journal
Abstract
The distribution of flocculating activity of culture broth was examined and the major constituent with flocculating activity was identified. Most of flocculating activity was found in culture broth without cells. As the activity was maintained by the digestion with pronase, it suggests that the activity is due to the polysaccharide. The bioflocculant obtained from $Lactobacillus$ $jensenii$ YW-33 was precipitated by 60~80% EtOH fractionation (LJ-80). LJ-80 was separated by ion-exchange chromatography using DEAE-Toyopearl 650C and LJ-80-II showed more potent flocculating activity than those of other fractions. The major activity fraction LJ-80-II was further purified on the gel permeation using Sepharose CL-6B to LJ-80-II-1. GPC (Sepharose CL-6B) and HPLC were used to determine whether LJ-80-II-1 has a homogenecity. The molecular weight of purified LJ-80-II-1 was estimated over 800,000 dalton by gel permeation chromatography. Purified LJ-80-II-1 contained 98.4% total sugar, 0.6% protein. Main sugar of purified LJ-80-II-1 was composed of mannose : galactose : glucose with a molar ratio of 1.61 : 0.25 : 1.00.
Keywords
bioflocculant; purification; characterization; polysaccharide;
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