Cleavage of interglycosidic linkages in per(trimethylsilyl)ated and permethylated carbohydrates with iodotrimethylsilane
作者:Susumu Honda、Tsunehiko Ichii、Kazuaki Kakehi
DOI:10.1016/0008-6215(83)88138-5
日期:1983.4
Abstract Iodotrimethylsilane in carbon tetrachloride cleaves interglycosidiclinkages in per(trimethylsilyl)ated disaccharides to give iodinolysis products that may be readily hydrolyzed to component monosaccharides. The cleavage rate is dependent on the type of interglycosidiclinkage, and is in the order (1→4) (1→2) (1→3) (1→6) for derivatives of β-linked glucobioses. This iodinolysis reagent is
Isolation and structures of ellagic acid derivatives from Euphorbia acaulis
作者:R.S. Bindra、N.K. Satti、O.P. Suri
DOI:10.1016/0031-9422(88)80150-x
日期:1988.1
Abstract A new ellagicacid glycoside, 3,3′-di- O -methyl ellagicacid 4′-rutinoside, along with 3,4,3′-tri- O -methyl ellagicacid 4′-rutinoside and 3,4,3′-tri- O -methyl ellagicacid have been isolated from the rhizomes of Euphorbia acaulis . The structures of these compounds have been established on the basis of spectral ( 1 H NMR, 13 C NMR, MS, IR, UV) and chemical evidence.
摘要 一种新的鞣花酸苷,3,3'-二-O-甲基鞣花酸4'-芸香苷,以及3,4,3'-三-O-甲基鞣花酸4'-芸香苷和3,4,3 '-三-O-甲基鞣花酸已从大戟的根茎中分离出来。这些化合物的结构是在光谱( 1 H NMR、 13 C NMR、MS、IR、UV)和化学证据的基础上确定的。
Khatoon; Khabiruddin; Asif, Journal of the Indian Chemical Society, 1989, vol. 66, # 4, p. 287 - 288
作者:Khatoon、Khabiruddin、Asif、Ansari
DOI:——
日期:——
Acetolysis of Leuconostoc mesenteroides NRRL B-1299 dextran. Isolation and characterization of oligosaccharides containing secondary linkages from the borate-soluble fraction
Fractionation of the deacetylated acetolyzate of the borate-soluble fraction of the dextran elaborated by L. mesenteroides NRRL B-1299 gave, after chromatography on charcoal-Celite, preparative paper-chromatography, and paper electrophoresis, 4 trisaccharide fractions and 4-tetrasaccharide fractions. The isolated oligosaccharides were characterized by their paper-chromatographic mobility, examination of partial acid-hydrolyzates of the oligosaccharides and their corresponding alditols, and methylation analysis. These oligosaccharides were kojitriose, isomaltotriose, a mixture of 2-O-.alpha.-isomaltosyl-D-glucose, 21-O-.alpha.-D-glucosylisomaltose and 2-O-.alpha.-nigerosyl-D-glucose, 6-O-.alpha.-kojibiosyl-D-glucose, isomaltotetraose, a mixture of 2-O-.alpha.-isomaltotriosyl-D-glucose and 21-O-.alpha.-D-glucosylisomaltotriose, 6-O-.alpha.-kojitriosyl-D-glucose and 63-O-.alpha.-D-glucosylkojitriose, respectively. Some of these oligosaccharides are newly isolated and characterized.
Isocaviunin 7-gentiobioside, a new isoflavone glycoside from Dalbergia sissoo