Studies on separation, purification and structure characteristics of a polysaccharide LTC-II from Pyrola corbieri / 中国中药杂志

ABSTRACT

<p><b>OBJECTIVE</b>To characterize the structure of polysaccharide LTC-II obtained from Pyrola corbieri.</p><p><b>METHOD</b>The polysaccharide was extracted from P. corbieri by hot water and ethanol precipitation. Crude polysaccharide was purified by DEAE-Cellulose chromatography and Sephacryl S-300 HR column chromatography. The purity and molecular weight of polysaccharide was determined by gel permeation chromatography. UV, IR, optical rotation, complete acid hydrolysis, periodate oxydation, Smith degradation, partial acid hydrolysis and methylation analysis were applied to determine the structural features.</p><p><b>RESULT</b>A homogeneous fraction LTC-II was obtained and its relative molecular mass was 22 000 Da. It consisted of arabinose, mannose, glucose, galactose in the molar ratio of 35. 2 1.0 13. 4 4. 2. LTC-II had a backbone consisting glucose, mannose, galactose and mainly contained (1 --> 6)-linkaged glucose. The side chain possessed arabinose, glucose, galactose and mainly contained (1 --> 5)-linkaged arabinose. The terminal sugar were mainly glucose and galactose.</p><p><b>CONCLUSION</b>Studies on the preliminary characterization of polysaccharide LTC-II from P. corbieri for the first time.</p>