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分别从α 甲壳素 (来源于蟹壳 )和 β 甲壳素 (来源于鱿鱼顶骨 )制备丙酰化甲壳素。丙酰化β 甲壳素的大角X光衍射图出现 2 0个衍射峰 ,而丙酰化α 甲壳素只在 2 0°左右出现弥散峰。发现丙酰化β 甲壳素的结晶属三斜晶系 ,a =7.997,b =1 3.0 67,c =6.31 6(任意单位 ) ,α =98°5 6′ ,β =1 0 4°1 9′,γ =82°2 6′。列表说明了各衍射峰的归属。据分析 ,每个单元晶胞内含一根分子链的 2 .5个葡萄糖残基单元。分子轴为b轴
Propionylated chitin was prepared from alpha chitin (derived from crab shell) and beta chitin (derived from squid parietal bone), respectively. The high-angle X-ray diffraction pattern of propionized β-chitin showed 20 diffraction peaks, while the propionized α-chitin appeared only at about 20 °. It was found that the crystals of propionized β-chitin are triclinic with a = 7.997, b = 1 3.067, c = 6.31 6 (arbitrary units), α = 98 ° 5 6 ’, β = 1 0 4 ° 1 9 ’, Γ = 82 ° 2 6’. The list shows the assignment of the diffraction peaks. According to the analysis, each cell unit contains a chain of 2.5 glucose residues unit. The molecular axis is the b axis