STRUCTURE OF BETA-CHITIN OR PARALLEL CHAIN SYSTEMS OF POLY-BETA-(1-]4)-N-ACETYL-D-GLUCOSAMINE
STRUCTURE OF BETA-CHITIN OR PARALLEL CHAIN SYSTEMS OF POLY-BETA-(1-]4)-N-ACETYL-D-GLUCOSAMINE
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DOI：
10.1002/bip.1969.360070302
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发表时间：
1969-01-01
期刊：
影响因子：
2.9
通讯作者：
BLACKWEL.J
中科院分区：
文献类型：
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作者：
BLACKWEL.J
β -几丁质的结构在高结晶材料的x射线衍射研究中得到了重新的检验。定向样品是通过将分散的去蛋白管悬浮在纤维蛋白凝块中，然后拉伸成定向纤维来制备的。β -几丁质的x射线衍射图被解释为这种材料由两种结构相的混合物组成，这两种结构相被命名为β -几丁质a和b。这种观点被制备的样品通过用二酚处理管只给出了a相的衍射图所证实。A相和B相都产生了一系列水合物结构。对β -几丁质A的最低水合物进行了详细的研究，发现它是由平行几丁质链组成的无水体系。这种形式的细胞为单斜晶胞，尺寸sa= 4.85 Å，b= 10.38 Å（纤维轴），c= 9.26 Å， β = 97.5°，空间群pp21。观测到的x射线强度与这种结构的计算结果基本一致。对低聚硅藻和硅藻棘β -几丁质的检测表明，这些材料也由A相和B相组成。
The structure of β‐chitin has been reexamined in anX‐ray diffraction study of the highly crystalline material available from pogonophore tubes. Oriented specimens were prepared by suspending the dispersed deproteinized tube in a fibrin clot which was then stretched into an oriented fiber. TheX‐ray diffraction patterns of pogonophore β‐chitin were explained by proposing that this material consists of a mixture of two structural phases which have been named β‐chitins A and B. This view was confirmed by the preparation of specimens which gave only the diffraction pattern of the A phase by treating the tubes with diaphanol. Both A and B phases gave rise to a series of hydrate structures. The lowest hydrate of β‐chitin A has been studied in detail and shown to consist of an anhydrous system of parallel chitin chains. For this form, the unit cell was monoclinic with dimensionsa= 4.85 Å,b= 10.38 Å (fiber axis),c= 9.26 Å, and β = 97.5°, and space groupP21. Reasonable agreement was obtained between the observedX‐ray intensities and those calculated for such a structure. Examination of the β‐chitin ofLoligopen and diatom spines showed that these materials also consist of these A and B phases.