Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Patent
1995-12-21
1998-08-18
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
510302, 510303, 510305, 510300, 510312, 510313, 510367, 510374, 8101, C11D 3386, C11D 326, C11D 3393
Patent
active
057958556
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to activation of enzymes. More specifically, the invention relates to agents capable of enhancing the activity of laccases and related enzymes.
The invention also relates to methods of oxidizing a substrate in the presence of a laccase enzyme, and an enhancing agent. More specifically, the invention relates to a method of bleaching of dye in solutions, to a method of inhibiting the transfer of a textile dye from a dyed fabric to another fabric when said fabrics are washed together in a wash liquor, to a method of bleaching lignin-containing material, in particular bleaching of pulp for paper production, to a method of treatment of waste water from pulp manufacturing, and to a method of enzymatic polymerization and/or modification of lignin or lignin containing material.
BACKGROUND ART
Laccases (E.C. 1.10.3.2) are enzymes that catalyse the oxidation of a substrate (an electron or hydrogen donor) with oxygen. Such enzymes are known from microbial, plant and animal origins, e.g. from fungi. They are typically copper proteins, i.e. they contain a copper atom or atoms as a prosthetic group.
Use of laccases has been suggested e.g. in bleaching of pulp for paper production, in treatment of waste water from pulp production, for improved bleaching in laundry detergents, for dye transfer inhibition during laundering, and for lignin modification, e.g. in particle board production.
The compound 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonate), ABTS, supplied by Boehringer Mannheim, is a chromogenic substrate, and a common peroxidase and phenol oxidase assay agent. These enzymes catalyse the oxidation of ABTS by hydrogen peroxide and dioxygen, respectively, producing a greenish-blue colour, which process may be monitored photometrically.
ABTS has been found to form a stable radical cation when oxidized by a laccase enzyme (polyphenol oxidase, EC 1.10.3.2), and has been proposed to act as a redox mediator for oxidation of non-phenolic lignin model
Studies on demethylation and delignification of kraft pulp by a laccase enzyme in the presence of ABTS showed that the extent of partial demethylation by laccase was increased in the presence of ABTS 823-827!.
Certain oxidizable substrates e.g. metal ions and phenolic compounds such as 7-hydroxycoumarin (7HCm), vanillin (VAN), and p-hydroxybenzenesulfonate (PHBS), have been described as accelerators or enhancers, able to enhance bleaching reactions (cf. e.g. WO 92/18683, WO 92/18687, and Kato M and Shimizu S, Plant Cell Physiol. 1985 26 (7), pp. 1291-1301 (cf. Table 1 in particular), or Saunders B C. et al., Peroxidase, London, 1964, p. 141 ff).
SUMMARY OF THE INVENTION
It has now surprisingly been found that organic chemical compounds consisting of at least two aromatic rings, of which aromatic rings at least one ring is substituted with one or more of the following atoms: nitrogen, oxygen, and sulfur, and which aromatic rings may furthermore be fused rings, are capable of enhancing the activity of laccase enzymes.
Accordingly, in its first aspect, the invention provides an agent for enhancing the activity of laccase enzymes, which agent is an organic chemical compound consisting of at least two aromatic rings, of which aromatic rings at least one ring is substituted with one or more of the following atoms: nitrogen, oxygen, and sulfur; and which aromatic rings may furthermore be fused rings.
In a more specific aspect, the invention provides an agent for enhancing the activity of laccase enzymes, which agent is an organic chemical compound of the general formula I: ##STR1## in which general formula A represents a single bond, or one of the following groups: (--CR.sup.11 .dbd.CR.sup.15 --).sub.n, (--CR.sup.11 .dbd.N--N.dbd.CR.sup.15 --), (--NR.sup.11 --), (--CR.sup.12 .dbd.N--).sub.n, (--NR.sup.11 --CR.sup.12 .dbd.N--N.dbd.CR.sup.15 --), (--NR.sup.11 --CR.sup.12 .dbd.N--).sub.n, (--CR.sup.12 .dbd.N--NR.sup.11 --), (--NR.sup.11 --CR.sup.12 .dbd.CR.sup.13 --) (--N.dbd.N--), in which groups n represents an integer of from 1 to 6; o
REFERENCES:
patent: 4634551 (1987-01-01), Burns et al.
patent: 5360569 (1994-11-01), Madison
patent: 5445755 (1995-08-01), Convents et al.
patent: 5451337 (1995-09-01), Liu et al.
Pedersen Anders Hjelholt
Schneider Palle
Fries Kery A.
Lambiris, Esq. Elias J.
Lieberman Paul
Novo Nordisk A S
Zelson Esq. Steve T.
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