Structural determination of the complex expolysaccharide from the virulent strain of Cryphonectria parasitica

摘要

The structure of a new exopolysaccharide from the virulent strain of Cryphonectria parasitica was elucidated by means of 2D NMR spectroscopy and selective degradations (mild hydrolysis and acetolysis). The polysaccharide is built up of mannose, galactose and rhamnose and has a rather complex non-repetitive structure than can be idealised as follows: Exopolysaccharides (EPSs) of fungi are thought to be agents of phytotoxicity and although the mechanism by which fungi invable plants is not known.