A SPECTROSCOPIC INVESTIGATION OF THE CARRAGEENANS AND AGAR IN THE 1500-100 CM(-1) SPECTRAL RANGE
A SPECTROSCOPIC INVESTIGATION OF THE CARRAGEENANS AND AGAR IN THE 1500-100 CM(-1) SPECTRAL RANGE
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DOI：
10.1016/0584-8539(93)80176-b
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发表时间：
1993-02-01
影响因子：
4.4
通讯作者：
LEGRAND, P
中科院分区：
文献类型：
--
作者：
SEKKAL, M;LEGRAND, P
在1600-100 cm-1范围内的傅里叶变换红外（FTIR）和拉曼光谱已被用于聚半乳聚糖型生物聚合物的结构分析。尽管在这个区域的光谱的复杂性，精确的分配已经作出，首先根据先前计算的频率的基本单元（D-半乳糖），其次通过比较的κ-，iota-，和β-卡拉胶，以及琼脂和适当的二糖的光谱。这项工作的结果提供了确认以前的分配在930，820，805和845 cm-1的红外光谱和其他几个频带的解释，特别是那些由于弯曲振动的糖苷键和1040和1010 cm-1之间。后者与O=S=O对称拉伸有关。还介绍了700-100 cm-1区域的情况，这方面以前没有报道。本分析可能提供了一个基础，为进一步研究的构象变化伴随凝胶化，这是一个过程，这是不同的聚半乳聚糖到另一个。
Fourier transform infrared (FTIR) and Raman spectra in the 1600-100 cm-1 range have been employed in a structural analysis of biopolymers of the polygalactane type. In spite of the complexity of the spectra in this region, precise assignments have been made, first on the basis of previously calculated frequencies of the basic unit (D-galactose) and secondly by comparing the spectra of kappa-, iota-, and lambda-carrageenans, as well as agar and appropriate disaccharides. The results of this work provide confirmation of previous assignments of IR absorptions at 930, 820, 805 and 845 cm-1 and the interpretation of several other bands, notably those due to bending vibrations of the glycosidic linkages and those between 1040 and 1010 cm-1. The latter are associated with the O=S=O symmetrical stretch. Assignments are also presented for the 700-100 cm-1 region, on which there are no previous reports. The present analysis may provide a basis for further studies of the conformational changes accompanying gelation, a process which is different from one polygalactane to another.