这篇期刊的方向/至少30字, 希望能够写关於期刊大致内容方向等] 1. 这篇文章大概描述(30字).... Starting from a chitosan sample with a degree of deacetylation of 71%, three separate sample sets were generated by successive deacetylation and reacetylation processes. The degree of deacetylation of samples was determined by UV spectrometry supported by thermogravimetric analysis. The molecular weight of chitosan samples was determined in a solvent system of 0.25 M CH3COOH/0.25 M CH3COONa, using viscometry and gel permeation chromatography (GPC) with a TSK-gel column. The first set of samples had a similar degree of deacetylation (DDA) but differing molecular weights. The second set of samples had a similar molecular weight but differing degrees of deacetylation. The Mark-Houwink-Sakurada constants used for the determination of viscosity average molecular weight and the universal calibration of the GPC system were K = 1.40 x 10(-4) dL/g and a = 0.83. Results showed that molecular weights determined from both techniques are in good accord only at lower degrees of deacetylation. This may be attributed to the fact that the chemical structure of chitosan samples could have been largely altered with increasing or decreasing degree of deacetylation. Nevertheless, the trend with which the molecular weights vary with the deacetylation time is consistent over a limited DDA range. A literature review of molecular weight analysis of chitosan is included. 直接贴摘要好像太混了，简单来说这是一篇PAPER REVIEW 有关几丁质和几丁聚糖， 内容我没有看到，不过大多数的人作法都是用黏度来做相对分子量，不过我比较龟毛 看到上面有GPC~~这是我目前仅知的唯一做绝对分子量的方法。 [期刊名称 与 标题卷号年份等资讯] 作者，出版年：Knaul, J. Z. Kasaai, M. R. Bui, V. T. Creber, K. A. M. 1998 篇 名：Characterization of deacetylated chitosan and chitosan molecular weight review 期刊名(卷期)：Canadian Journal of Chemistry-Revue Canadienne De Chimie 76(11) 页 数：1699-1706 [期刊网址/ 太长的话 请到http://tinyurl.com缩网址] http://0rz.tw/963gS [我的e-mail][email protected] 或 [email protected] 欢迎跟我一起讨论 -- My Hmepage:http://www.fst.ntu.edu.tw/kissinwang/index.htm (整合页面) Vous êtes belles mais vous êtes vide 你们很美，但又如此空虚 On ne peut pas mourir pour vous 因为人们不会为了你们而死去 On ne voit bien qu'avec le cœur 只有用心才能看得清 Il faut comprendre, l'essentiel est 必须懂得：那些本质的东西 Invisible pour les yeux... 用眼睛是看不见的… --

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