Biotechnology Reports (Mar 2020)

Sequential degradation of raw vinasse by a laccase enzyme producing fungus Pleurotus sajor-caju and its ATPS purification

  • Joberson Alves Junior,
  • Yago Araujo Vieira,
  • Ianny Andrade Cruz,
  • Débora da Silva Vilar,
  • Mario M. Aguiar,
  • Nádia Hortense Torres,
  • Ram Naresh Bharagava,
  • Álvaro Silva Lima,
  • Ranyere Lucena de Souza,
  • Luiz Fernando Romanholo Ferreira

Journal volume & issue
Vol. 25

Abstract

Read online

This study evaluated simultaneously the raw vinasse degradation, an effluent from the sugar-alcohol industry, the laccase production by Pleurotus sajor-caju and its purification using aqueous two-phase systems (ATPS). To improve laccase production, different concentrations of inducers (ethanol and CuSO4) were added. The higher laccase production promoted an increase of 4-fold using 0.4 mM of CuSO4 as inducer, with maximum enzymatic activity of 539.3 U/L on the 3rd day of fermentation. The final treated vinasse had a decolorization of 92% and turbidity removal of 99% using CuSO4. Moreover, the produced laccase was then purified by ATPS in a single purification step, reaching 2.9-fold and recovered ≈ 99,9 %, in the top phase (PEG-rich phase) using 12 wt% of PEG 1500 + 20 wt% of citrate buffer + enzyme broth + water, at 25 °C. Thus, an integrated process of vinasse degradation, laccase production and purification with potential industrial application was proposed. Keywords: Biomass, biological treatment, decolorization, inducers, laccase purification