Polysaccharides ofEremurus. XXIV. Pectin substances ofEremurus and dynamics of the accumulation of pectin inEremurus lactiflorus

Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 109–110, January–February, 1990.     

Polysaccharides ofEremurus. XV. Structure of the glucomannan ofEremurus lactiflorus

Ten oligosaccharides have been isolated from the products of the partial hydrolysis of a native acetylated glucomannan obtained fromEremurus lactiflorus O. Fedtsch. Their structures have been studied with the aid of acid hydrolysis before and after reduction with NaBH₄, by the GLC method, and also by chromatography with markers. The compositions and sequence of the monomers in tetra- and heptaoligo-saccharides have been determined by the¹³C NMR method. The glucommannan ofE. lactiflorus differs from theEremurus glucomannans studied previously by the ratio of monosaccharides, the presence of 0-Ac groups, the degree of polymerization, and the presence of a cellobiose unit (Glcp-Glcp) in the polymer chain. The repeating unit consists of 14 hexose residues.     

Polysaccharides ofEremurus. X. Characteristics of the polysaccharides ofEremurus lactiflorus andE. luteus

Water-soluble polysaccharides have been isolated from two species ofEremurus — E. lactiflorus andE. luteus — with yields of 13.5% and 20.5%, respectively. They contained mainly glucose and mannose in ratios of 1:5 and 1:3.1. The polysaccharides ofE. lactiflorus were separated from a column of DEAE-cellulose. The yield of neutral fraction was 10.3%. Gel filtration of the polysaccharides on Sephadex G-200 showed their polydispersity. Homogeneous fractions were obtained by fractional precipitation with ethanol. They have been characterized with respect to monosaccharide composition, molecular weight, and IR spectra.     

Polysaccharides of Eremurus. XXVI. Study of the structure of the pectin from the leaves of Eremurus regelii

The partial acid hydrolysis of the homogeneous fraction C of the pectin fromEremurus regelii Vved. leaves has given a galacturonan. Its structure has been established on the basis of the results of periodate-nitric acid oxidation, methylation, and¹³C NMR spectroscopy.Institute of Chemistry of Plant Substances, Uzbekistan Republic Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 191–194, March–April, 1993.     

Polysaccharides ofUngernia. XV. A study of the pectin substances of the leaves ofUngernia tadschicorum

Pectin substances have been isolated from the leaves ofUngernia tadschicorum and characterized. A galacturonan has been obtained by partial hydrolysis. On the basis of the results of IR spectroscopy and periodiate — nitric acid oxidation, its structure has been established as an α-1→4-bound polymer-homolog. Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, FAX (3712) 62 73 48. Translated from Khimiya Prirodnykh Soedinenii, No. 3, 320–322, May–June, 1994.     

Pectin substances of the mulberry

Several variants of the isolation of pectin substances from mulberry boughs are considered.     

Pectin substances of the mulberry

Several variants of the isolation of pectin substances from mulberry boughs are considered.Institute of the Chemistry of Plant Substances, Uzbek Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 773–775, November–December, 1989.