Synthesis and NMR structural analysis of O-succinyl derivative of low-molecular-weight κ-carrageenan |
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Authors: | Yun-Peng Xi-Kun Guo Xiu-Fang Tian |
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Institution: | Department of Chemistry, College of Science, Shantou University, Shantou 515063, People's Republic of China |
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Abstract: | Low-molecular-weight (LMW) κ-carrageenan was achieved through mild hydrochloric acid hydrolysis of κ-carrageenan. The acylation of LMW κ-carrageenan was performed by use of tetrabutylammonium (TBA) salt of the anionic polysaccharide fragments, succinic anhydride, 4-dimethylaminopyridine and tributylamine under homogeneous conditions in N,N-dimethylformamide at 80 °C. Investigation of FT-IR spectrum of the succinylated LMW κ-carrageenan showed that a monoester derivative with succinyl group was formed when LMW κ-carrageenan reacted with succinic anhydride. The 1H and 13C NMR spectroscopy has been used to characterize the fine structure of O-succinyl derivative of the LMW κ-carrageenan. The 13C and 1H NMR chemical shifts of disaccharide unit of O-succinyl LMW κ-carrageenan have been fully assigned using 2D NMR spectroscopic techniques. |
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Keywords: | Low-molecular-weight κ-Carrageenan Acylation Succinic anhydride |
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