Journal
ENZYME AND MICROBIAL TECHNOLOGY
Volume 44, Issue 6-7, Pages 380-385Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2009.02.003
Keywords
Laccase; Dyeing; Cotton modification; Covalent linkage; NMR; Electrochemistry
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Funding
- Comissionat per a Universitats i Recerca del Departament d'Innovacio, Universitats i Empresa de la Generalitat de Catalunya [033168]
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Oxidation of colourless dye precursors with laccase enzyme provided simultaneous in situ generation and fixation of a pigment on amino groups pre-functionalized cotton fabric. Aromatic amine moieties of 2,5-diaminobenzenesulfonic acid introduced onto tosylated cotton were coupled and copolymerised with a phenolic compound catechol into coloured product covalently fixed on the fabric upon oxidation with laccase. The controlled amination of cellulose in a first step and subsequent colouration allowed for Lip to 95% pigment fixation on the fabric. Electrochemical studies were performed to elucidate the mechanism of the pigment formation. The pigment was further isolated from the acid hydrolysate of the dyed cellulose fabric to confirm the covalent fixation and to further elucidate the pigment structure by means of FTIR, MS, H-1 and C-13 NMR analysis. An oligomeric pigment has been identified composed by up to six phenolic units. (C) 2009 Elsevier Inc. All rights reserved.
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