Enzymatic degradation of chloramphenicol by laccase from Trametes hirsuta and comparison among mediators

Kavitha Keshava Navada,Ananda Kulal

Published 2019 in International Biodeterioration & Biodegradation

ABSTRACT

Abstract The laccase enzyme from white-rot fungus Trametes hirsuta brought about degradation of 0.5 mg/L chloramphenicol within seven days without mediators, which is typically found in the pharmaceutical wastes. This study is first of its kind which showed that the higher concentrations of chloramphenicol (10 mg/L) was efficiently degraded in the presence of laccase mediator system (LMS) like syringaldehyde, vanillin, ABTS and α-naphthol. The addition of mediators escalated the degradation process from 10% to 100% within 48 h. The kinetic parameter Vmax of the laccase mediated degradation reactions with and without mediators comprehensively proved the potentiality of laccase and its redox mediators in bioremediation of most stable micro-pollutants i.e., antibiotics in the pharmaceutical wastes. Further, the laccase mediated degradation of chloramphenicol was confirmed by the microbial susceptibility assay. The formation of chloramphenicol aldehyde after degradation of chloramphenicol was confirmed through LC-MS analysis and proved to be non-toxic to the tested micro-organisms.

PUBLICATION RECORD

  • Publication year

    2019

  • Venue

    International Biodeterioration & Biodegradation

  • Publication date

    2019-03-01

  • Fields of study

    Biology, Chemistry, Environmental Science

  • Identifiers
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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