Repeated batch for dye degradation in an airlift bioreactor by laccase entrapped in copper alginate. (May 2017)

• Record Type: Journal Article
• Authors: Teerapatsakul, Churapa; Parra, Roberto; Keshavarz, Tajalli; Chitradon, Lerluck
• Is Part Of: International biodeterioration & biodegradation. Volume 120(2017)
• Page Start: 52
• Page End: 57
• Publication Date: 2017-05
• Subjects: Airlift bioreactor -- Copper alginate -- Decolorization -- Degradation -- Immobilization -- Laccase; Biodegradation -- Periodicals; Bioremediation -- Periodicals; Biodegradation -- Periodicals; Biodégradation -- Périodiques; Biorestauration -- Périodiques; Electronic journals; 620.11223
• DOI: 10.1016/j.ibiod.2017.02.001
• Languages: English
• ISSNs: 0964-8305

Abstract

Abstract: A repeated batch of synthetic dye decolorization was efficiently demonstrated in a 5 L airlift bioreactor. A laccase from Ganoderma sp. KU-Alk4, degrading commercial aromatic dyes was selected. The crude enzyme extract expressed laccase activity, and was immobilized under optimal conditions in copper-alginate beads, 3 IU/bead. The immobilized enzyme showed high efficiency in degrading various synthetic dyes under non-buffered conditions, in particular the indigoid dye Indigo Carmine. The immobilized laccase also showed marked increase in stability toward temperature and pH when compared with free enzyme preparation. Immobilization enhanced its temperature stability to maintain initial activity up to 55 °C, ten degrees higher than the free enzyme. The immobilized laccase was stable in the alkaline region up to pH 10.0. The dye decolorization system in 5 L airlift bioreactor was demonstrated with 25 mg/L Indigo Carmine dissolved in tap water and a total immobilized laccase activity of 6 × 10 4 IU. Airflow rate was the most important factor affecting the number of batch runs and the time for 100% dye degradation. An optimal airflow rate was of 4 L/min. Fourteen batch runs of complete dye degradation were successfully completed with only a single enzyme supplementation, and this could be a feasible system for operation in industry. Total dye degraded by this repeated process at 4 L/min airflow rate was 1.8 g. Isatin sulfonic acid was a metabolic product of Indigo Carmine degradation catalyzed by the immobilized laccase. This development of an effective repeatable bioprocess using enzymes for the treatment of dye-contaminated effluent has potential for implementation on an industrial scale. Graphical abstract: Highlights: This is the first report of repeated batch for dye degradation in an airlift bioreactor by copper-alginate laccase. The biocatalyst was efficient at low concentrations without the need for any buffer. Fourteen batch runs of complete dye degradation were successfully completed with only a single enzyme supplementation. Isatin sulfonic acid was a product of Indigo Carmine degradation catalyzed by the immobilized laccase.