Structural Studies of a Hemicellulose Fraction Isolated from Groundnut Shell(Arachis hypogea)

摘要

The groundnut shell was found to contain moisture(8.50 %),ash(3.01 %),lignin(23.60 %).,protein(6.30 %),silica(0.69 %),crude fibre(65.94 %)and total carbohydrate(15.00 %).Hemicellulose fractions were isolated from groundnut shell by successive extractions with alkali of increasing concentration.A xylan fraction was isolated by extraction with 1 M aqueous sodium hydroxide.Sugar,methylation,specific rotation and IR spectral analyses of the purified hemicellulose revealed that the xylan obtained from groundnut shell was essentially(1->4)-p-linked and had a 4-O-methylglucuronopyranosyl unit substituted at position 2 of almost 13th xylose residues.