%0 Journal Article
%T An acidic polysaccharide with xylose branches from Porphyra yezoensis<br>
%A ZHANG Weiyun
%A CHEN Hao
%A WANG Shuijuan
%A XIA Zhonghao
%A FEI Xiugeng
%A TAN Renxiang
%A <br>
%J 科学通报(英文版)
%D 2001
%I 
%X An acidic polysaccharide (PY3) was isolated from the hot water extract of the red algaePorphyra yezoensis by successive column chromatographies over DEAE-cellulose and Sephadex G-200. PY3 with an average molecular weight of 1.8×105 was demonstrated to be composed of galactose (Gal), 3,6-anhydrogalactose (3,6-AnGal), 6-OSO3-galactose (6-OSO3-Gal) and xylose (Xyl) in an approximate molar ratio of 25: 15 : 10 : 1. In view of Smith degradation and methylation and on the basis of spectral evidence including those of IR, GC, GC-MS. and1H and13C NMR, the most probable repeating unit of PV3 could be proposed as (1→ 3)β-D-Gal(1→4)α-L-3,6-AnGal]3-(1→3)β-D-Gal(1→4)α-L6-OSO3-Gal]2 with a xylose moiety at the C6 of one of every twenty-five β-D-Gal residues. To our knowledge, PY3 was shown to be the first porphyran possessing occasional xylose branches.
%K Porphyra yezoensis
%K acidic polysaccharide
%K structure elucidation<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=DEBF2D41312DC32AC54698CBD46E5E39&yid=14E7EF987E4155E6&vid=D997634CFE9B6321&iid=38B194292C032A66&sid=334E2BB8B9A55ABB&eid=AA27B676BFCAA4BE&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=1&reference_num=0