[期刊] chitosan and chitosan MW. review
這篇期刊的方向/至少30字, 希望能夠寫關於期刊大致內容方向等]
1. 這篇文章大概描述(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.
直接貼摘要好像太混了，簡單來說這是一篇PAPER REVIEW 有關幾丁質和幾丁聚糖，
內容我沒有看到，不過大多數的人作法都是用黏度來做相對分子量，不過我比較龜毛
看到上面有GPC~~這是我目前僅知的唯一做絕對分子量的方法。
[期刊名稱 與 標題卷號年份等資訊]
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)
頁 數：1699-1706
[期刊網址/ 太長的話 請到http://tinyurl.com縮網址]
http://0rz.tw/963gS
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