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Titolo:
BIOBLEACHING OF SOFTWOOD AND HARDWOOD KRAFT PULP WITH MANGANESE PEROXIDASE
Autore:
EHARA K; TSUTSUMI Y; NISHIDA T;
Indirizzi:
UNIV SHIZUOKA,FAC AGR SHIZUOKA 422 JAPAN
Titolo Testata:
Mokuzai Gakkaishi
fascicolo: 10, volume: 43, anno: 1997,
pagine: 861 - 868
SICI:
0021-4795(1997)43:10<861:BOSAHK>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
WOOD-ROTTING FUNGI; PHANEROCHAETE-CHRYSOSPORIUM; LIGNIN BIODEGRADATION; CORIOLUS-VERSICOLOR; OXIDATIVE CLEAVAGE; IZU-154;
Keywords:
BIOBLEACHING; KRAIT PULP; LIGNIN DEGRADATION; MANGANESE PEROXIDASE; TOTAL EFFECTIVE CHLORINE;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
K. Ehara et al., "BIOBLEACHING OF SOFTWOOD AND HARDWOOD KRAFT PULP WITH MANGANESE PEROXIDASE", Mokuzai Gakkaishi, 43(10), 1997, pp. 861-868

Abstract

Unbleached softwood kraft pulp (SWKP) and hardwood kraft pulp (HWKP) were biobleached with partially purified manganese peroxidase (MnP), and the bleaching performances were evaluated. No difference was observed between SWKPs and HWKP in the delignification rates by a single MnPtreatment. Brightness of HWKP increased with increasing treatment time, whereas the brightness of SWKPs decreased during the first 3 or 6 hand increased more thereafter. Alkaline nitrobenzene oxidation analysis suggested that the oxidation of non-condensed lignin that resulted in the formation of chromophore and the condensation reaction by MnP may lead to greater brightness decreases of SWKPs than of HWKP. Repeated MnP treatments combined with alkaline extraction gave more significant delignification and brightening than did a single MnP treatment. The total effective chlorine required to obtain a pulp of 85% brightnessby chlorine-based chemical bleaching after repeated MnP treatments was reduced to 51%, 66%, and 69% for normal-lignin-content SWKP, low-lignin-content SWKP, and HWKP, respectively, compared to the conventionalbleaching process without introducing enzyme treatments.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 10:30:28