Chemical functional groups of extractives, cellulose and lignin extracted from native Leucaena leucocephala bark

Abstract Bark from trees is considered a worthless raw material. However, this resource could be economically beneficial if utilized efficiently due to its rich chemical compounds. In study, an ethanol toluene-soluble extractive, alpha-cellulose and lignin obtained Leucaena leucocephala bark were characterized determine their functional groups. Based on FTIR spectral analysis, the results indicated that bands of groups extractive original remain unchanged; however, absorbance intensity was found weaker in group frequency fingerprint regions. Removal pectin, hemicellulose indirectly increased strong cellulose. Broad peaks OH stretching all spectra assigned presence phenolic aliphatic structures for aromatic lignin. It revealed mainly while water, carbonyl ether dominant cellulose, methyl, methylene, carboxyl enriched Graphic abstract