Fractionation of five technical lignins by selective extraction in green solvents and characterization of isolated fractions

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Abstract

Lignins from softwood, hardwood, grass and wheat straw were fractionated by selective extraction at ambient temperature using green solvents like acetone/water solutions of 10, 30, 50, 70 and 90% (v/v) acetone and ethyl acetate. A comparison between the isolated fractions and unfractionated lignins was made in terms of extraction yield, lignin solubility factor, molecular weight distribution and functional group composition. Low molecular weight (LMW) lignin fractions with narrow dispersity are obtained by extraction with ethyl acetate and acetone–water solution containing 30% acetone, with yields depending on the type and the functional group content of lignins. A significant amount (56%) of the organosolv hardwood lignin with low molecular weight (Mw = 1868 g/mol) and low dispersity was isolated from ethyl acetate. Insoluble fractions with very high molecular weight (Mw between 10 and 17 kg/mol) are obtained in low yield from acetone–water solutions with 50, 70 and 90% acetone. LMW lignins are in general less condensed and have lower aliphatic hydroxyl content than parent lignins while the HMW fractions have a higher content of condensed hydroxyls. Principal component analysis on the chemical composition of lignins and isolated fractions determined from 31P NMR data showed the high heterogeneity of the technical lignins. Partial least squares models based on FT-IR spectral data were developed to predict the functional group content determined by quantitative 31P NMR analysis of technical lignins and lignin fractions. This approach can be used to develop simple, rapid and accurate analytical tools to monitor and control the selective fractionation of lignin.
Original languageEnglish
Pages (from-to)481-490
JournalIndustrial Crops and Products
Volume62
DOIs
Publication statusPublished - 2014

Fingerprint

lignin
fractionation
acetone
molecular weight
hardwood
softwood
wheat straw
spectral analysis
least squares
solubility
ambient temperature
principal component analysis
chemical composition
grasses

Keywords

  • antioxidant activities
  • structural features
  • alcell(r) lignin
  • molecular-weight
  • kraft lignin
  • solubility
  • spectroscopy
  • prediction
  • ethanol
  • wood

Cite this

@article{4fcdfdedfbae437196f8554b036fe269,
title = "Fractionation of five technical lignins by selective extraction in green solvents and characterization of isolated fractions",
abstract = "Lignins from softwood, hardwood, grass and wheat straw were fractionated by selective extraction at ambient temperature using green solvents like acetone/water solutions of 10, 30, 50, 70 and 90{\%} (v/v) acetone and ethyl acetate. A comparison between the isolated fractions and unfractionated lignins was made in terms of extraction yield, lignin solubility factor, molecular weight distribution and functional group composition. Low molecular weight (LMW) lignin fractions with narrow dispersity are obtained by extraction with ethyl acetate and acetone–water solution containing 30{\%} acetone, with yields depending on the type and the functional group content of lignins. A significant amount (56{\%}) of the organosolv hardwood lignin with low molecular weight (Mw = 1868 g/mol) and low dispersity was isolated from ethyl acetate. Insoluble fractions with very high molecular weight (Mw between 10 and 17 kg/mol) are obtained in low yield from acetone–water solutions with 50, 70 and 90{\%} acetone. LMW lignins are in general less condensed and have lower aliphatic hydroxyl content than parent lignins while the HMW fractions have a higher content of condensed hydroxyls. Principal component analysis on the chemical composition of lignins and isolated fractions determined from 31P NMR data showed the high heterogeneity of the technical lignins. Partial least squares models based on FT-IR spectral data were developed to predict the functional group content determined by quantitative 31P NMR analysis of technical lignins and lignin fractions. This approach can be used to develop simple, rapid and accurate analytical tools to monitor and control the selective fractionation of lignin.",
keywords = "antioxidant activities, structural features, alcell(r) lignin, molecular-weight, kraft lignin, solubility, spectroscopy, prediction, ethanol, wood",
author = "C.G. Boeriu and F. Fitigau and R.J.A. Gosselink and A.E. Frissen and J.H. Stoutjesdijk and F. Peter",
year = "2014",
doi = "10.1016/j.indcrop.2014.09.019",
language = "English",
volume = "62",
pages = "481--490",
journal = "Industrial Crops and Products",
issn = "0926-6690",
publisher = "Elsevier",

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TY - JOUR

T1 - Fractionation of five technical lignins by selective extraction in green solvents and characterization of isolated fractions

AU - Boeriu, C.G.

AU - Fitigau, F.

AU - Gosselink, R.J.A.

AU - Frissen, A.E.

AU - Stoutjesdijk, J.H.

AU - Peter, F.

PY - 2014

Y1 - 2014

N2 - Lignins from softwood, hardwood, grass and wheat straw were fractionated by selective extraction at ambient temperature using green solvents like acetone/water solutions of 10, 30, 50, 70 and 90% (v/v) acetone and ethyl acetate. A comparison between the isolated fractions and unfractionated lignins was made in terms of extraction yield, lignin solubility factor, molecular weight distribution and functional group composition. Low molecular weight (LMW) lignin fractions with narrow dispersity are obtained by extraction with ethyl acetate and acetone–water solution containing 30% acetone, with yields depending on the type and the functional group content of lignins. A significant amount (56%) of the organosolv hardwood lignin with low molecular weight (Mw = 1868 g/mol) and low dispersity was isolated from ethyl acetate. Insoluble fractions with very high molecular weight (Mw between 10 and 17 kg/mol) are obtained in low yield from acetone–water solutions with 50, 70 and 90% acetone. LMW lignins are in general less condensed and have lower aliphatic hydroxyl content than parent lignins while the HMW fractions have a higher content of condensed hydroxyls. Principal component analysis on the chemical composition of lignins and isolated fractions determined from 31P NMR data showed the high heterogeneity of the technical lignins. Partial least squares models based on FT-IR spectral data were developed to predict the functional group content determined by quantitative 31P NMR analysis of technical lignins and lignin fractions. This approach can be used to develop simple, rapid and accurate analytical tools to monitor and control the selective fractionation of lignin.

AB - Lignins from softwood, hardwood, grass and wheat straw were fractionated by selective extraction at ambient temperature using green solvents like acetone/water solutions of 10, 30, 50, 70 and 90% (v/v) acetone and ethyl acetate. A comparison between the isolated fractions and unfractionated lignins was made in terms of extraction yield, lignin solubility factor, molecular weight distribution and functional group composition. Low molecular weight (LMW) lignin fractions with narrow dispersity are obtained by extraction with ethyl acetate and acetone–water solution containing 30% acetone, with yields depending on the type and the functional group content of lignins. A significant amount (56%) of the organosolv hardwood lignin with low molecular weight (Mw = 1868 g/mol) and low dispersity was isolated from ethyl acetate. Insoluble fractions with very high molecular weight (Mw between 10 and 17 kg/mol) are obtained in low yield from acetone–water solutions with 50, 70 and 90% acetone. LMW lignins are in general less condensed and have lower aliphatic hydroxyl content than parent lignins while the HMW fractions have a higher content of condensed hydroxyls. Principal component analysis on the chemical composition of lignins and isolated fractions determined from 31P NMR data showed the high heterogeneity of the technical lignins. Partial least squares models based on FT-IR spectral data were developed to predict the functional group content determined by quantitative 31P NMR analysis of technical lignins and lignin fractions. This approach can be used to develop simple, rapid and accurate analytical tools to monitor and control the selective fractionation of lignin.

KW - antioxidant activities

KW - structural features

KW - alcell(r) lignin

KW - molecular-weight

KW - kraft lignin

KW - solubility

KW - spectroscopy

KW - prediction

KW - ethanol

KW - wood

U2 - 10.1016/j.indcrop.2014.09.019

DO - 10.1016/j.indcrop.2014.09.019

M3 - Article

VL - 62

SP - 481

EP - 490

JO - Industrial Crops and Products

JF - Industrial Crops and Products

SN - 0926-6690

ER -