A MODIFIED DFRC METHOD FOR LIGNIN STRUCTURAL ANALYSIS

摘要

A modified DFRC (Derivatization followed by Reductive Cleavage) method has been developed to allow quantitative determination of monomeric products of three different structural origins in lignin: phenolic β-O-4, etherified α-O-4 and etherified β-O-4 structures. The modified DFRC method was used to study the effect of ball milling on the structure of lignin. While rotary ball milling for 7 days has little effect on lignin structure, vibratory ball milling for 48 hours may cause substantial structural changes including condensation. MWL may not be representative of the total lignin in wood.