Comparative analysis of existence form for selenium and structural characteristics in artificial selenium-enriched and synthetic selenized green tea polysaccharides

多糖 化学 单糖 立体化学 有机化学 生物化学
作者
Jiangxiong Zhu,Chuang Yu,Zi Han,Ziyan Chen,Xinlin Wei,Yuanfeng Wang
出处
期刊:International Journal of Biological Macromolecules [Elsevier]
卷期号:154: 1408-1418 被引量:65
标识
DOI:10.1016/j.ijbiomac.2019.11.022
摘要

In recent years, selenium-enriched polysaccharides (Se-PS) have been paid more and more attention, and the activity of many Se-PSs has been studied but little on their structure. This study aimed to investigate the activity, structural characterization and present forms of selenium in two different artificial selenium-enriched tea polysaccharides (Se-TPS). The physicochemical analysis showed that both CSe-tps1 and ASe-tps1 were acidic heteropolysaccharides with different monosaccharide composition, molar ratio, and selenium content. Structural investigations including FT-IR, Raman spectra and 1D, 2D NMR analysis revealed that selenium in CSe-tps1 replaced the hydroxyl group at the C-6 position in the polysaccharide with the form of selenyl ester, while most of the selenium in ASe-tps1 replaced the hydroxyl group at the C-1 and C-6 position in the form of the SeH bond on the branch of the polysaccharide. Besides, a series of studies on the structural characteristics of the Congo red test, I2-KI reaction, FESEM, DSC, and XRD analysis showed that the two artificial Se-TPSs had a triple helix structure and more branches. However, there were significant differences in crystal morphology, apparent morphology, heat release ability, and the α-glucosidase inhibition activity. These results indicated that the difference in artificial selenization methods not only made the polysaccharide exhibit different structural characteristics and the hypoglycemic activity, but also had a significant effect on the form of selenium in polysaccharides.
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