Fourier transform Raman difference spectroscopy for detection of lignin oxidation products in thermomechanical pulp.
Spruce thermomechanical pulp (TMP) was oxidized by the 2,2'azinobis-3-ethylbenzthiazoline-6-sulfonate cation radical (ABTS*+) in the presence and absence of oxygen. The pulp modification was monitored by Fourier transform (FT) Raman difference spectroscopy and other nondestructive spectroscopic methods. The ABTS*+ oxidative system resulted in modifications very similar to the laccase-ABTS-oxygen system, except for the FT-Raman results, which showed a difference in mechanisms attributed to a difference in produced Raman bands. Oxygen resulted in no oxygen-derived products, but only enhanced the production of a specific Raman band of several oxidation-produced bands. Detailed information on lignin reactions can be obtained from FT-Raman signals.
Vester
Jette
J
Chemical Institute, University of Copenhagen, 5 Universitetsparken, DK-2100 Copenhagen, Denmark.
Felby
Claus
C
Nielsen
Ole Faurskov
OF
Barsberg
Søren
S
D006358:Hot Temperature; D042845:Laccase / Q000378:metabolism; D008031:Lignin / Q000737:chemistry*; D010084:Oxidation-Reduction; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013314:Stress, Mechanical; D014934:Wood
D008031:Lignin; D042845:Laccase