A glucomannan from Arum korolkovii
SummaryA glucomannan has been isolated from the tubers ofArum korolkovii Regel. It has been shown that the polysaccharide contains O-acetyl groups and consists mainly of (1 → 4)-β-linked aldohexopyranose units of glucose and mannose in a ratio of 1:1.6. The nonreducing ends of the glucomannan are glucose residues, and branching is localized at C2 and C3 of mannose.
A glucomannan from the tubers of Arum orientale
Abstract Two glucomannans ( A and B ), and an attendant polysaccharide ( C ) have been isolated from the tubers of Arum orientale (L.) by gel chromatography. Glucomannan B was found to be composed of d -glucose and d -mannose in a molar ratio of 2:3·1, and traces of uronic acid. IR spectra, enzymatic hydrolysis with α- and β-amylase, and periodate oxidation followed by reduction, showed the presence of a β-(1→4) glucoside linkage in this glucomannan, and of hexose residues in a β-pyranose form.
The structure of a galactomannan from the seeds of Desmodium pulchellum
Abstract The galactomannan from the seeds of Desmodium pulchellum contains d -galactose and d -mannose in the ratio of 1:2. Hydrolysis of the methylated galactomannan gave 2,3,4,6-tetra-O-methyl- d -galactose, 2,3,6-tri-O-methyl- d -mannose and 2,3-di-O-methyl- d -mannose. Galactose has been found to constitute the end-group of the polysaccharide. The galactomannan contains α-linked d -galactopyranose combined with 1,4,6- and 1,4-β-linked d -mannopyranose units.