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Characterization and comparison of Acetosolv and Milox lignin isolated from crofton weed stem
Author(s) -
Zhao Xuebing,
Dai Lingmei,
Liu Dehua
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30604
Subject(s) - lignin , weed , gel permeation chromatography , fourier transform infrared spectroscopy , chemical structure , chemistry , chemical composition , nuclear chemistry , organic chemistry , botany , biology , polymer , chemical engineering , engineering
Crofton weed ( Eupatorium adenophorum Spreng) is an invasive species in China, which has damaged native ecosystems and caused great economic losses. To use the weed instead of simple control and management of it, the weed stem of was delignified by Acetosolv and Milox processes to obtain lignin. The lignins (Acetosolv lignin, AL; and Milox lignin, ML) were characterized and compared through several analysis methods. It was found that both of AL and ML were syringyl‐guaiacyl type (GS) lignin, but that the chemical composition and structure of the two lignins were somewhat different. The obtained C 9 expanded formulas for AL and ML were C 9 H 9.16 O 3.50 N 0.13 (OCH 3 ) 0.97 (PhOH) 0.34 Ac 0.22 and C 9 H 7.96 O 3.13 N 0.13 (OCH 3 ) 1.23 (PhOH) 0.51 Ac 0.14 , respectively. According to an elementary analysis, the two lignins had similar higher heat value of 20.0–21.0 MJ kg −1 , which were similar to that of raw coal. Gel permeation chromatography analysis indicated the two lignins had similar molecular weights. Notwithstanding that the Ultraviolet, Fourier transform infrared, and 1 H‐NMR spectra illustrated that the two lignins had similar chemical functional groups, the AL showed more acetyl groups signals. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009