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Titolo:
Structural changes of residual lignin in softwood kraft pulp treated with manganese peroxidase
Autore:
Ehara, K; Tsutsumi, Y; Nishida, T;
Indirizzi:
Univ Shizuoka, Fac Agr, Dept Forest Resources Sci, Shizuoka 4228529, JapanUniv Shizuoka Shizuoka Japan 4228529 ources Sci, Shizuoka 4228529, Japan
Titolo Testata:
JOURNAL OF WOOD SCIENCE
fascicolo: 4, volume: 44, anno: 1998,
pagine: 327 - 331
SICI:
1435-0211(1998)44:4<327:SCORLI>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHANEROCHAETE-CHRYSOSPORIUM; OXIDATIVE CLEAVAGE; VERSICOLOR; ENZYMES;
Keywords:
kraft pulp; residual lignin; manganese peroxidase; functional group; alkaline nitrobenzene oxidation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Nishida, T Univ Shizuoka, Fac Agr, Dept Forest Resources Sci, Shizuoka 4228529, Japan Univ Shizuoka Shizuoka Japan 4228529 Shizuoka 4228529, Japan
Citazione:
K. Ehara et al., "Structural changes of residual lignin in softwood kraft pulp treated with manganese peroxidase", J WOOD SCI, 44(4), 1998, pp. 327-331

Abstract

Structural changes of residual lignin in unbleached softwood kraft pulp (SWKP) during manganese peroxidase (MnP) treatment were investigated to obtain some understanding of the biobleaching action of SWKP with MnP treatment. Alkaline-extracted lignin from darkened SWKP by MnP showed more intense color and contained more o-quinone than that from control SWKP. However, no difference in the conjugated alpha-carbonyl was observed between the ligninsfrom MnP-treated and control SWKP. The nitrobenzene oxidation analysis revealed that oxidative condensation of non-condensed lignin in SWKP occurs during an early stage of MnP treatment. These observations were supported by the model experiment in which the lignin prepared from control SWKP was subjected to MnP treatments three times, and the changes of color and functional groups in the lignin were determined after each treatment. These resultssuggested that an increase in o-quinone and the condensation reaction of non-condensed lignin in SWKP are responsible for the characteristic darkening of SWKP during MnP treatment. It was also ascertained that darkened lignin was degraded and brightened by repeated MnP treatments.

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Documento generato il 02/12/20 alle ore 17:56:55