55018-81-0Relevant academic research and scientific papers
Isolation, purification and structural characterization of a water-soluble polysaccharide HM41 from Halenia elliptica D. Don
Liu, Chun-Lan,Li, Yang,Xu, Gui-Yun,Li, Ya-Shuang
, p. 979 - 983 (2016/06/13)
A water-soluble polysaccharide, HM41, was obtained from Halenia elliptica D. Don by acidic ethanol fractionation and gel filtration. Its homogeneity was confirmed by chromatography using multiple systems. HM41 was composed of rhamnose (Rha), arabinose (Ara), xylose (Xyl), mannose (Man), galactose (Gal), glucose (Glc) with a molar ratio of 1.0:5.5:1.8:3.0:9.4:21. The average molecular weight of HM41 was approximately 1.17 × 104. Periodate oxidation, Smith degradation, methylation and GC, IR, NMR, XRD, GC-MS analysis were used for the structural analysis of HM41. Its main chain was composed mainly of β-(1 → 4)Gal, β-(1 → 4)Glc and β-(1 → 6)Glc. β-(1 → 4)Gal were substituted at 6-O and on average there were 14 branches among 23 main chain residues; (1 → 4)Glc had no branch; (1 → 6)Glc were substituted at 3-O and on average there were 9 branches among 14 main chain residues. The side chain was composed of (1 → 3,6)-Rha, (1 → 4)/(1 → 5)-Ara, (1 → 4)/(1 → 5)-Xyl, (1 → 4,6)-Man and (1 → 2)-Glc. The terminal residue was composed of Ara, Xyl, Man, Gal, and Glc. Then, we demonstrated that HM and HM41 had strong scavenging activities in vitro hydroxyl. Overall, HM and HM41 may have potential applications in the antioxidants for medical and food industry.
Thermal Degradation of Glycosides, IV Degradation of Flavonoid Glycosides
Kim, Youn Chul,Higuchi, Ryuichi,Kitamura, Yoichi,Komori, Tetsuya
, p. 1285 - 1290 (2007/10/02)
By mere heating, the flavone (1, 7), flavanone (4, 10), and flavonol glycosides (13, 14) are converted into their aglycones and monoglycosides.The products of pyrolysis have been isolated by chromatography and their structures elucidated by chemical and spectroscopic methods.The compound derived from the sugar moiety in the pyrolysis of glucosides has been identified as levoglucosan (17).From the structures of some minor products (16, 18, 19), generated by the thermal degradation, a mechanism of their generation and the elucidation of the structures of rearranged ions (for example +), often generated in the FD-mass spectra of glycosides, are presented. Key Words: Degradation, thermal / Glycosides / Flavonoid glycosides / FDMS fragmentation / Carbohydrates
