The non-resistant components of the Wood of Eucalyptus regnans F. Muell. II. Polysaccharide constituents

Abstract

It is shown that the wood of Eucalyptus regnans F. Muell., on hydrolysis with N sulphuric acid, yields an aldobiuronic acid containing 4-O-methyl-D-glucuronic acid and D-xylose residues. The composition of the non-resistant hemicellulose of E. regnans wood is compared. with hemicelluloses obtained from various sources by other workers. The evidence suggests that the non-resistant hemicellulose in situ is composed, basically, of a poly-(hexaxylose 4-O-methyl-D-glucosiduronic acid) complex containing, in addition, acetyl groups and possibly galactose residues.