Mild peroxyformic acid fractionation of Miscanthus x giganteus bark. Behaviour and structural characterization of lignin

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abstract

Miscanthus x giganteus bark was subjected to mild fractionation with peroxyformic acid by a two stage process. A factorial experimental design was used to study and quantify the effect of the variables (formic acid concentration (80-90%), hydrogen peroxide concentration (0.2-0.4%), temperature of the first stage (60-80 degrees C), and treatment time of the second stage (60-120 min)) on the main parameters of fractionation: pulp yield, remaining lignin and total polysaccharides in pulp. The dependence of lignin precipitation rate on hydrogen peroxide concentration in liquor was also studied. Hydrogen peroxide concentrations inferior to 0.5% seems to be suitable to recover high percentages of lignin. The isolated lignin was analysed by 2D-HSQC, (13)C- and (31)P NMR spectroscopy, FTIR spectroscopy, size-exclusion chromatography and chemical analysis. The most important chemical modifications taken place in the lignin during the fractionation were identified: beta-O-4' cleavage and hydrolysis of LC-bond structures. The C9-formula was also determined: C(9)H(6.81)O(2.90)(OCH(3))(0.68)(COOH)(0.07)(OH(Ph))(0.38)(OH(Al))(0.33). Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.

keywords

ACETIC-ACID; DELIGNIFICATION; SINENSIS; PLANTS; KENAF; UNITS

subject category

Agriculture

authors

Villaverde, JJ; Li, JB; Ligero, P; Ek, M; de Vega, A

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Publication Details

type
Journal Article
year
2012
journal
INDUSTRIAL CROPS AND PRODUCTS
volume
35
publisher
ELSEVIER SCIENCE BV
issn
0926-6690
issue
1
digital object identifier
10.1016/j.indcrop.2011.07.013
web of science article identifier
WOS:000296110700039

Journal Metrics (JCR 2019)

Journal Impact Factor
4.244
Journal Impact Factor (5 yrs)
4.583
category normalized journal percentile
90.11

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