Lipase from Pseudomonas aeruginosa LP602: Biochemical properties and application for wastewater treatment

• Main Authors: S. Dharmsthiti, B. Kuhasuntisuk
• Other Authors: Mahidol University
• Format: Article
• Published: 2018
• Subjects: Biochemistry, Genetics and Molecular Biology; Immunology and Microbiology
• Online Access: https://repository.li.mahidol.ac.th/handle/123456789/18314

Lipase from Pseudomonas aeruginosa LP602, a bacterial strain isolated from a domestic wastewater sample, was preliminarily characterized. The enzyme exhibited maximum lipolytic activity at pH 8.0 where it was also stably maintained. At 55°C, the lipase had the highest activity but not stability. The enzyme was insensitive to EDTA and to many ions tested except Zn2+. It was sensitive to SDS but not to Tween-20, Tween-80 or Triton X-100. The enzyme was active towards a number of commercial food grade fats and oils. A suitable medium formula for lipase production was MMP containing 6.25% whey as a carbon source, 1% soybean oil as inducer and 0.5% yeast extract supplement. The culture was fed with glucose to a final concentration of 0.1% at the 15th hour of incubation. Lipase production under this condition was 3.5 U ml-1. Both P. aeruginosa LP602 cells and the lipase were shown to be usable for lipid-rich wastewater treatment.