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Effects of pretreatment temperature and alkali concentration on the composition of alkali‐soluble lignins from wheat straw
Author(s) -
Sun Runcang,
Lawther J. Mark,
Banks W. B.
Publication year - 1996
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/(sici)1097-4628(19961128)62:9<1473::aid-app17>3.0.co;2-#
Subject(s) - alkali metal , straw , lignin , composition (language) , chemistry , chemical engineering , materials science , organic chemistry , inorganic chemistry , linguistics , philosophy , engineering
A new rapid method of two step precipitation for isolation of alkali‐soluble lignins with relatively free of polysaccharides from wheat straw was proposed in this study. The isolated alkali‐soluble lignin fractions LA contained rather low amounts of neutral sugars (0.7–1.0%) and had low average molecular weights (960–1440 Da). The isolated lignin fractions LA contained roughly equal amounts of guaiacyl (G) and syringly (S) units with relatively fewer p ‐hydroxyphenyl (H) units, and appeared to be closely associated to phenolic acids and glucuronic acid or 4‐ O ‐methylglucuronic acid. The chemical compositions in each of the fractions are reported. The physico‐chemical properties and structure features of these lignin fractions LA were characterized by UV‐, IR‐, 13 C‐NMR‐spectroscopy, and alkaline nitrobenzene oxidation. © 1996 John Wiley & Sons, Inc.