Saito Yukie, Tomotake Youtaro, Shida Satoshi
Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
Biomacromolecules. 2007 Apr;8(4):1064-8. doi: 10.1021/bm060643s. Epub 2007 Mar 6.
A lamellar compound resulted from reaction of acrylic acid inside crystalline beta-chitin and the structure was investigated. Beta-chitin acts like a layered crystal, having stacked molecular sheets composed of parallel chains bound in one direction by intermolecular amide hydrogen bonding. Small guest molecules can be inserted between the molecular sheets, and a crystallosolvate can be formed. By immersion of beta-chitin in acrylic acid, a crystallosolvate was formed, which was then changed into the more stable lamellar compound by heat treatment at 105 degrees C. NMR measurement and IR spectroscopy showed that during the heat treatment there was a reaction between acrylic acid and the beta-chitin molecular sheet, but the sheet structure was maintained. By IR with deuteration, it was shown that the accessibility of solvents to this lamellar compound was greater than that for the initial beta-chitin. The lamellar compound is considered a kind of "pillared" structure related to the lamellar crystal.
研究了丙烯酸在结晶β-几丁质内部反应生成的层状化合物及其结构。β-几丁质表现为层状晶体，具有由平行链组成的堆叠分子片层，这些平行链在一个方向上通过分子间酰胺氢键结合。小客体分子可以插入分子片层之间，并形成晶体溶剂化物。将β-几丁质浸入丙烯酸中形成晶体溶剂化物，然后在105℃下进行热处理，将其转变为更稳定的层状化合物。核磁共振测量和红外光谱表明，在热处理过程中丙烯酸与β-几丁质分子片层之间发生了反应，但片层结构得以保持。通过氘代红外光谱表明，该层状化合物对溶剂的可及性大于初始β-几丁质。该层状化合物被认为是一种与层状晶体相关的“柱撑”结构。
