title: Decolorization of the metal textile dye Lanaset Grey G by immobilized white-rot fungi.
abstract: In this paper we studied the ability of four Tunisian-isolated fungi (i.e. Coriolopsis gallica, Bjerkandera adusta, Trametes versicolor and Trametes trogii) immobilized into Ca-alginate beads to decolorize the metal textile dye Lanaset Grey G (LG). The effect of different operational conditions, such as initial dye concentration, temperature, pH, beads/medium ratio and agitation, on dye decolorization by the immobilized fungi was investigated. Maximal decolorization percentages of 88.7%, 89.3%, 82.1% and 81.3% for C. gallica, B. adusta, T. versicolor and T. trogii were attained, respectively, when operating at an initial LG concentration of 150 mg/L, pH values of 5.0-6.0, temperatures of 40-45 °C and a beads/medium ratio of 20% (w/v) in static conditions after 72 h of incubation. Subsequently, the re-usability of the immobilized fungi was evaluated. After three decolorization cycles, the decolorization percentage of free cell cultures dropped to values below 36%, while decolorization percentages of about 75%, 70%, 60% and 68% were obtained by the immobilized cultures of C. gallica, B. adusta, T. versicolor and T. trogii, respectively.
authors: Université de Sfax, Ecole Nationale d'Ingénieurs de Sfax, Laboratoire de Génie Enzymatique et de Microbiologie, Route de Soukra Km 4.5, BP «1173», 3038 Sfax, Tunisia.
authors: Dalel
authors: D
authors: Daâssi
authors: Tahar
authors: T
authors: Mechichi
authors: Moncef
authors: M
authors: Nasri
authors: Susana
authors: S
authors: Rodriguez-Couto
mesh_terms: D000464:Alginates / Q000737:chemistry; D001673:Biodegradation, Environmental; D002857:Chromium / Q000378:metabolism; D003035:Cobalt / Q000378:metabolism; D004396:Coloring Agents / Q000378:metabolism*; D055453:Coriolaceae / Q000378:metabolism*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D055454:Trametes / Q000378:metabolism; D014416:Tunisia; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D000464:Alginates; D004396:Coloring Agents; D006603:Hexuronic Acids; D014874:Water Pollutants, Chemical; D002857:Chromium; D003035:Cobalt; D020723:Glucuronic Acid
keywords: Alginate; Biodegradation; Immobilization; Metal textile dye; White-rot fungi