碱诱导β-甲壳素向α-甲壳素的转化。

Alkali-induced conversion of beta-chitin to alpha-chitin.

作者信息

Noishiki Yasutomo, Takami Hiroko, Nishiyama Yoshiharu, Wada Masahisa, Okada Shigeru, Kuga Shigenori

机构信息

Department of Biomaterials Science and Laboratory of Marine Biochemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.

出版信息

Biomacromolecules. 2003 Jul-Aug;4(4):896-9. doi: 10.1021/bm0257513.

DOI:10.1021/bm0257513

PMID:12857070

Abstract

Crystal conversion of beta-chitin to alpha-chitin by aq. NaOH treatment was studied for a highly crystalline beta-chitin sample from diatom spine. The minimum NaOH concentration to cause swelling was between 25% and 30% w/w. The alkali-swollen material was poorly crystalline and was regenerated as alpha-chitin on washing with water. This conversion caused total collapse of the original microfibrillar morphology. These features are similar to those of 7 N-8 N HCl treatment reported earlier, but alkali treatment was free from depolymerization or deacetylation.

摘要

通过氢氧化钠水溶液处理将β-几丁质晶体转化为α-几丁质，对来自硅藻刺的高结晶度β-几丁质样品进行了研究。引起膨胀的最低氢氧化钠浓度在25%至30%（重量/重量）之间。碱溶胀材料结晶度差，用水洗涤后再生为α-几丁质。这种转化导致原始微纤维形态完全崩溃。这些特征与先前报道的7N - 8N盐酸处理的特征相似，但碱处理没有解聚或脱乙酰化现象。