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Biodegradation of Synthetic Effluent Containing CI Direct Red 28 (Congo Red) by Lentinus crinitus Laccase Leads to Low Ecotoxicity

Author(s):

Glauciane Danusa Coelho, Kamila Katiane Sotero Silva, Dayse Pereira Dias Silva, Julya Karolyne Neres Costa Soares, Nara Ballaminut and Douglas Vieira Thomaz*   Pages 1 - 7 ( 7 )

Abstract:


Background: Azo dyes are widely used recalcitrant chemicals and may promote environmental hazard. Amongst the known azo dyes is CI Direct Red 28 (C32H22N6Na2O6S2) aka Congo Red (CR), which is a known mutagen and carcinogen. In this sense, this work aimed the biodegradation of a CR-containing synthetic effluent, and the evaluation of the ecotoxicity of post-treatment residues.

Methods: Lentinus crinitus Laccase (Lac)-mediated bioremediation of CR was optimized upon added concentrations of sucrose and CuSO4, moreover a standard ecotoxicity assay was performed.

Results: Results showcased that the addition of 5% sucrose and 2 mM CuSO4 increase CR degradation, being Lac activity at 48 h of 30.2 U mL-1, and at 72 h of 31.9 U mL-1. Moreover, the ecotoxicity assay showcased that CR degradation by L. crinitus Lac seemingly generated low ecotoxic byproducts.

Conclusion: Given that CR bioremediation byproducts were known to exhibit high toxicity, our results shed light on the use of L. crinitus catalytic arsenal to promote proper remediation of azo dye-polluted effluents.

Keywords:

Bioremediation, oxidative degradation, polluted effluents, toxicity, azo dyes, environment.

Affiliation:

Federal University of Campina Grande, R. Aprígio Veloso, 882 - Bodocongó, Campina Grande - PB, Federal University of Campina Grande, R. Aprígio Veloso, 882 - Bodocongó, Campina Grande - PB, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Av. Ipiranga, 2752 - Azenha, Porto Alegre - RS, Paraiba State University, R. Baraúnas, 351 - Universitário, Campina Grande - PB, Federal University of Goias, Rua Aroeira, Goiânia-GO, Faculty of Pharmacy, Federal University of Goias, Rua 240, S/n - Setor Leste Universitário, Goiânia , GO



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