African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6693

Full Length Research Paper

Extracellular lipase of the antarctic bacterial isolate, Pseudomonas sp. INK1 as a potential tool for improving the flavor quality of dairy products

Inkyung Park and Jaiesoon Cho*
Department of Animal Science and Environment, College of Animal Bioscience and Technology, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 143-701, South Korea.
Email: [email protected]

  •  Accepted: 23 March 2012
  •  Published: 30 April 2012

Abstract

An antarctic bacterial isolate displayed extracellular lipolytic activity. Based on the 16S rRNA sequence analysis, the strain was named Pseudomonas sp. INK1. The INK1 lipase was secreted into the production medium during transition to the stationary phase. The enzyme reached the apparent maximal activity at pH 8 to 9, with optimal activity at 50°C. The enzyme was active against a wide range of fatty acid esters of p-nitrophenyl, showing the highest activity towards p-nitrophenyl caprylate. It could also release caprylic acid from a natural substrate cream. The enzyme activity was strongly inhibited by Zn2+ and Mn2+, and slightly enhanced by EDTA. INK1 lipase may be a potentially useful catalyst to enhance the buttery flavor of dairy products.   

 

Key words: Antarctic, lipolytic, Pseudomonas sp., catalyst, dairy products.