C-13 NMR OF LIGNINS IN AQUEOUS ALKALI .1. IONIZATION EFFECT ON THE SPECTRA OF MODEL COMPOUNDS AND MILLED WOOD LIGNINS

Authors
AKIM LG FEDULINA TG SHEVCHENKO SM
Citation
Lg. Akim et al., C-13 NMR OF LIGNINS IN AQUEOUS ALKALI .1. IONIZATION EFFECT ON THE SPECTRA OF MODEL COMPOUNDS AND MILLED WOOD LIGNINS, Holzforschung, 50(3), 1996, pp. 237-244
Citations number
22
Categorie Soggetti
Forestry,"Materials Science, Paper & Wood
Journal title
Holzforschung → ACNP
ISSN journal
00183830
Volume
50
Issue
3
Year of publication
1996
Pages
237 - 244
Database
ISI
SICI code
0018-3830(1996)50:3<237:CNOLIA>2.0.ZU;2-3
Abstract
The C-13 NMR spectra of 24 lignin model compounds in organic solvents (DMSO-D-6, acetone-D-6) and in aqueous alkali are compared, and ionisa tion chemical shifts (ICS) determined. The data are used to interpret the spectra of lignins in aqueous alkali. The difference between the N MR spectra of lignins in their molecular and ionized forms is characte ristic of lignin structure evidencing the number of free phenolic hydr oxyl groups.