Acidolysis of Bamboo Lignin II : Isolation and Identification of Acidolysis Products

Abstract

Guaiacyl, syringyl and ρ-hydroxyphenyl monomers which are expected by cleavage of the β-ether bonds in arylglycerol-β aryl ether structures have been isolated and identified in the acidolysis products of a bamboo MWL by various methods such as IR and NMR spectrometry. ω-Hydroxysyringylacetone was the predominant product in monomeric fraction followed by w-hydroxyguaiacylacetone. DL-Syringaresinol and DL-episyringaresinol were isolated from dimeric fraction and identified by melting point, UV, IR, NMR and mass spectrometry. These findings in addition to previous results indicate that the bamboo MWL is a mixed polymer of guaiacyl and syringyl propanes and a small amount of ρ-hydroxyphenylpropane connected through similar linkages found in spruce MWL.