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Titolo:
DEGRADATION OF LIGNIN-CARBOHYDRATE COMPLE X (LCC) BY WOOD-ROTTING FUNGI .2. STRUCTURAL-ANALYSIS OF DEGRADED LIGNIN-CARBOHYDRATE COMPLEX
Autore:
TSUJIYAMA S; AZUMA J; OKAMURA K;
Indirizzi:
KYOTO PREFECTURAL UNIV,FAC AGR KYOTO 606 JAPAN KYOTO UNIV,FAC AGR,SAKYO KU KYOTO 60601 JAPAN
Titolo Testata:
Mokuzai Gakkaishi
fascicolo: 6, volume: 39, anno: 1993,
pagine: 674 - 683
SICI:
0021-4795(1993)39:6<674:DOLCX(>2.0.ZU;2-W
Fonte:
ISI
Lingua:
JPN
Soggetto:
BROWN-ROT FUNGUS; C-BETA CLEAVAGE; PHANEROCHAETE-CHRYSOSPORIUM; CORIOLUS-VERSICOLOR; MODEL-COMPOUND; SPRUCE WOOD; PEROXIDASE; POLYMERIZATION; PURIFICATION;
Keywords:
LIGNIN-CARBOHYDRATE COMPLEX (LCC); BIODEGRADATION OF LCC; WOOD-ROTTING FUNGI; TYROMYCES-PALUSTRIS; CORIOLUS-VERSICOLOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
S. Tsujiyama et al., "DEGRADATION OF LIGNIN-CARBOHYDRATE COMPLE X (LCC) BY WOOD-ROTTING FUNGI .2. STRUCTURAL-ANALYSIS OF DEGRADED LIGNIN-CARBOHYDRATE COMPLEX", Mokuzai Gakkaishi, 39(6), 1993, pp. 674-683

Abstract

Two wood-rotting fungi, Tyromyces palustris (Berk. and Curt. ) Murr. and Coriolus versicolor (L.: Fr. ) Quel, were incubated for 31 days in amedium containing a water-soluble lignin-carbohydrate complex (LCC) as a sole carbon source, and the chemical structure of the Fraction P-1formed as an insoluble material during the incubation was characterized. Although the neutral sugar compositions of the Fraction P-1 from both fungi did not show characteristic changes during the incubation, remarkable differences were found in the lignin portion. In the case ofT. palustris, results of functional and spectral analyses indicated the occurrence of a slight modification of the lignin portion, and the molecular weight of the Fraction P-1 decreased from about 4,000 to 2,900. On the other hand, an attack on the lignin portion by C. versicolor was found to occur in at least two steps. The first was initiated after about 7 days of incubation. In this step, the contents of phenolichydroxyl and alpha-carbonyl groups decreased, whereas an increase of carboxylic acid and an increase in molecular weight from 3,600 to 6,400 were observed, indicating the occurrence of a side-chain modification and the polymerization of lignin. The second step was initiated after about 21 days of incubation. At this step, an increase in the phenolic hydroxyl group content was noticed, and carbon -13 nuclear magneticresonance (C-13- NMR) spectroscopic and gel-permeation chromatographic (GPC) analyses indicate the occurrence of cleavage of the aryl-etherlinkages of lignin, leading to the decrease in its molecular weight. In addition, bondings between lignin and hemicellulose were cleaved accompanied by depolymerization of LCC in the case of C. versicolor.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 06:53:47