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Titolo:
DEGRADATION OF NONPHENOLIC BETA-O-4 TYPE LIGNIN CARBOHYDRATE COMPLEX MODEL COMPOUNDS BY LIGNIN PEROXIDASE FROM THE WHITE-ROT FUNGUS PHANEROCHAETE-CHRYSOSPORIUM
Autore:
TOKIMATSU T; MIYATA S; AHN SH; UMEZAWA T; HATTORI T; SHIMADA M;
Indirizzi:
KYOTO UNIV,WOOD RES INST UJI KYOTO 611 JAPAN TAEGU UNIV,COLL AGR KYONGSANGBUKU DO 713714 SOUTH KOREA
Titolo Testata:
Mokuzai Gakkaishi
fascicolo: 2, volume: 42, anno: 1996,
pagine: 173 - 179
SICI:
0021-4795(1996)42:2<173:DONBTL>2.0.ZU;2-D
Fonte:
ISI
Lingua:
JPN
Soggetto:
AROMATIC RING CLEAVAGE; OXALIC-ACID; VERATRYL ALCOHOL; OXIDATION;
Keywords:
LIGNIN CARBOHYDRATE COMPLEX; LIGNIN PEROXIDASE; WHITE-ROT FUNGUS; PHANEROCHAETE CHRYSOSPORIUM; OXALIC ACID;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
T. Tokimatsu et al., "DEGRADATION OF NONPHENOLIC BETA-O-4 TYPE LIGNIN CARBOHYDRATE COMPLEX MODEL COMPOUNDS BY LIGNIN PEROXIDASE FROM THE WHITE-ROT FUNGUS PHANEROCHAETE-CHRYSOSPORIUM", Mokuzai Gakkaishi, 42(2), 1996, pp. 173-179

Abstract

Non-phenolic beta-O-4 type lignin carbohydrate complex (LCC) model compounds (1) in erythro- and threo-forms were oxidized by lignin peroxidase (LiP) from the white-rot fungus Phanerochaete chrysosporium Burds. 4-O-Ethylvanillin produced as a result of the enzymatic C-alpha-C-beta bond and C-alpha-ether bond eleavages of 1 was determined by gas chromatography-mass spectrometry. The initial reaction rates of formation of the cleavage product from the diastereomeric isomers of 1 were compared with those of the diastereomeric beta-O-4 model compounds (2), veratryl alcohol xyloside (3), and veratryl alcohol (4). The reaction rates decreased in the following order: 4>3 approximate to 2>1. The amounts of the benzaldehyde products produced from LCC model substrate 1were decreased by addition of oxalate into the LiP system. However, oxalate added was concomitantly decomposed to carbon dioxide. It is noteworthy that, in contrast to the smaller reaction rates of the formation of benzaldehydes from the LCC model substrates (1 and 3), the LCC model substrates were more effective than the corresponding non-sugar analogs (2 and 4) in decomposing the oxalate. The inhibition of the formation of the cleaved product by oxalate was explained as such that the cation radical intermediates of LCC model substrates formed by the one-electron oxidation oxidized oxalate to CO2, and was concomitantly reduced back to the substrates level.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 20:12:20