Decolorization of an anthraquinone-type dye using a laccase formulation

• Published in: Bioresource technology Vol. 79; no. 2; pp. 171 - 177
• Main Authors: Soares, Graça M.B, Costa-Ferreira, Maria, Pessoa de Amorim, M.T
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-09-2001; Elsevier Science
• Subjects: anthraquinones; Anthraquinones - metabolism; Biological and medical sciences; Biological treatment of waters; Biotechnology; Chromatography, Gel; Color; Coloring Agents - metabolism; decolorization; dyes; Dyestuffs; Environment and pollution; Fundamental and applied biological sciences. Psychology; gel chromatography; Hydrogen-Ion Concentration; Industrial applications and implications. Economical aspects; Kinetics; Laccase; Mediator; molecular weight; nonionic surfactants; Oxidoreductases - metabolism; RBBR; Spectrophotometry; Surface-Active Agents - chemistry; Surfactant; Temperature; temperature profiles; thermal stability; Time Factors; wastewater treatment; Dyestuffs; Mediator; Surfactant; RBBR; Laccase; Benzotriazole derivatives; Enzymatic treatment; Enzyme; Decolorizing agent; Non ionic surfactant; Anthraquinone dye; Decolorizing process; Molecular weight; Thermal stability; Biological purification; Formulation; Gel filtration; pH; Oxidoreductases; Kinetic parameter; Redox system; Waste water purification; Dye works
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/S0960-8524(01)00043-8

Decolorization of the dye Remazol Brilliant Blue R (RBBR) was studied, as it is representative of an important class of recalcitrant anthraquinone-type dyes. For this purpose a commercial laccase formulation (CLF) containing laccase, a redox mediator and a non-ionic surfactant was used. Small molecular weight components were removed from the CLF by gel filtration, which made it possible to compare the effect of its laccase alone. Apart from slightly better thermostability of the CLF as compared with the laccase alone, the pH and temperature profiles were similar regardless of the presence of the small molecular weight components. The laccase alone did not decolorize RBBR. A small molecular weight redox mediator (HBT) was necessary for decolorization to occur. A comparison of the kinetics of RBBR decolorization using the CLF and its laccase alone is reported. Provided that a redox mediator is included, it is suggested that laccase may be suitable for the wastewater treatment of similar anthraquinone dyes.