On chemistry of γ-chitin
On chemistry of γ-chitin
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DOI：
10.1016/j.carbpol.2017.08.076
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发表时间：
2017-11-15
影响因子：
11.2
通讯作者：
Labidi, Jalel
中科院分区：
文献类型：
--
作者：
Kaya, Murat;Mujtaba, Muhammad;Labidi, Jalel
生物材料甲壳素在自然界中以三种同质异晶形式存在：α，β和γ。虽然大多数研究都涉及α-和β-甲壳素，只有少数调查集中在γ-甲壳素，其结构和物理化学性质还没有得到很好的描述。在这项研究中，甲壳素首次获得的茧的蛾（Orgyia dubia）进行了广泛的理化分析和检查，在平行，α-甲壳素从外骨骼的淡水蟹和5-甲壳素从乌贼骨的共同乌贼。结合~（13）C CP-MAS NMR、XRD、FT-IR、拉曼光谱、TGA、DSC、SEM、AFM、几丁质酶消化试验和元素分析等技术，证实了β-几丁质的真实性。此外，量子化学计算进行了所有三个同质异能态的形式，并与我们的物理化学分析，表明γ-甲壳素是不同的，但在结构上更接近α-甲壳素比β-甲壳素。
The biological material, chitin, is present in nature in three allomorphic forms: alpha, beta and gamma. Whereas most studies have dealt with alpha- and beta-chitin, only few investigations have focused on gamma-chitin, whose structural and physicochemical properties have not been well delineated. In this study, chitin obtained for the first time from the cocoon of the moth (Orgyia dubia) was subjected to extensive physicochemical analyses and examined, in parallel, with alpha-chitin from exoskeleton of a freshwater crab and 5-chitin from cuttlebone of the common cuttlefish. Our results, which are supported by13C CP-MAS NMR, XRD, FT-IR, Raman spectroscopy, TGA, DSC, SEM, AFM, chitinase digestive test and elemental analysis, verify the authenticity of beta-chitin. Further, quantum chemical calculations were conducted on all three allomorphic forms, and, together with our physicochemical analyses, demonstrate that gamma-chitin is distinct, yet closer in structure to alpha-chitin than beta-chitin.