The use of low-cost brewery waste product for the production of surfactin as a natural microbial biocide

Talita Correa Nazareth, Canrado Planas Zanutto, Lakshmi Tripathi, Abdulaziz Juma, Danielle Maass, Antonio Augusto De Douza, Selene Maria de Arruda Guelli De Souza, Ibrahim Banat

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Abstract

Surfactin has potential as next generation antibiofilm agent to combat antimicrobial resistance against emerging pathogens. However, the widespread industrial applications of surfactin is hampered by its high production cost. In this work, surfactin was produced from Bacillus subtilis using a low-cost brewery waste as a carbon source. The strain produced 210.11 mg L −1 after 28 h. The antimicrobial activity was observed against all tested strains, achieving complete inhibition for Pseudomonas aeruginosa, at 500 μg mL −1. A growth log reduction of 3.91 was achieved for P. aeruginosa while, Staphylococcus aureus and Staphylococcus epidermidis showed between 1 and 2 log reductions. In the anti-biofilm assays against P. aeruginosa, the co-incubation, anti-adhesive and disruption showed inhibition, where the greatest inhibition was observed in the co-incubation assay (79.80%). This study provides evidence that surfactin produced from a low-cost substrate can be a promising biocide due to its antimicrobial and anti-biofilm abilities against pathogens.

Original languageEnglish
Article numbere00537
Number of pages10
JournalBiotechnology Reports
Volume28
Early online date16 Oct 2020
DOIs
Publication statusPublished - 31 Dec 2020

Keywords

  • Adhesion
  • Biofilm
  • Biosurfactants
  • Brewery waste
  • Surfactin

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