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Your search keyword '"Dye precursors"' showing total 2 results
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2 results on '"Dye precursors"'

1. Laccase-assisted Dyeing of Cotton.

Author

Hadzhiyska, Hristina, Calafell, Margarita, Gibert, Josep M., Dagà, Josep M., and Tzanov, Tzanko

Subjects
COTTON dyeing, COTTON, LACCASE, DYES & dyeing, CATECHOL, OXIDATION
Abstract

Cotton cellulose was dyed “in situ” with a polymeric dye generated by oxidative coupling of colourless 2,5-diaminobenzenesulfonic acid and 1-hydroxyphenol (catechol) with laccase. Up to 70% dye fixation was obtained increasing the concentration of catechol less soluble upon oxidation from 1 to 10 mmol, while 1 mmol of diamine was used. Dye fixation was not achieved using equal molar concentrations of the reagents. [ABSTRACT FROM AUTHOR]

Published
2006
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2. Effect of some pocess parameters in enzymatic dyeing of wool

Author

Andrea Zille, Tzanko Tzanov, Carla J. S. M. Silva, Jovita Oliveira, Artur Cavaco-Paulo, and Universidade do Minho

Subjects
0106 biological sciences, Time Factors, Catechols, Dye precursors, Bioengineering, Resorcinol, Phenylenediamines, 01 natural sciences, Applied Microbiology and Biotechnology, Biochemistry, 03 medical and health sciences, chemistry.chemical_compound, 010608 biotechnology, Animals, Full factorial design, Modifiers full factorial design, Coloring Agents, Molecular Biology, 030304 developmental biology, Laccase, Analysis of Variance, 0303 health sciences, Catechol, Chromatography, Enzymatic dyeing, Science & Technology, biology, Chemistry, Wool, Modifiers, Temperature, Resorcinols, General Medicine, Factorial experiment, Hydrogen-Ion Concentration, Enzyme assay, Scientific method, biology.protein, Dyeing, Biotechnology
Abstract

This article reports on the dyeing of wool using an enzymatic system comprising laccase; dye precursor, 2,5-diaminobenzenesulfonic acid; and dye modifiers, catechol and resorcinol. Enzymatic dyeing was performed as a batchwise process at the temperature and pH of maximum enzyme activity. The effects of the process variables reaction time, enzyme, and modifier concentration on fabric color were studied, according to an appropriate experimental design. Different hues and depths of shades could be achieved by varying the concentration of the modifiers and the time of laccase treatment. The duration of the enzymatic reaction appeared to be the most important factor in the dyeing process. Thus, the dyeing process, performed at low temperature and mild pH, was advantageous in terms of reduced enzyme and chemical dosage.

Published
2003

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