title: Isolation and functional characterization of novel biosurfactant produced by Enterococcus faecium.
abstract: The objective of the present study was to isolate the biosurfactant (BS) producing lactic acid bacteria (LAB) from traditional fermented food (buttermilk) and its functional and structural characterization. BS isolated from strain MRTL9 reduced surface tension from 72.0 to 40.2 mN m(-1). The critical micelle concentration (CMC) of BS was 2.25 mg ml(-1) with emulsification efficiency (E24) after 24 h of 64% against kerosene oil. The cell bound BS was partially purified by silica gel column chromatography and found as glycolipid. The gas chromatography and mass spectroscopy data revealed the fatty acid as hexadecanoic acid. Xylose was determined as hydrophilic moiety. The BS was found to be stable to pH changes over a range of 4.0-12.0, being most effective at pH 7 and showed no apparent loss of surface tension and emulsification efficiency after heat treatment at 120°C for 15 min. The outcomes of cellular toxicity showed lower toxicity of BS in comparison to SDS and rhamnolipids. Current study confirmed the preventive anti-adhesion activity of BS. These amphiphilic molecules, interferes with the microbial adhesion and found to be least cytotoxic with cellular compatibility with mouse fibroblasts cells.
authors: Department of Microbiology, Kurukshetra University, Kurukshetra, 136 119 INDIA ; Dairy Microbiology Division, National Dairy Research Institute, Karnal, Haryana 132 001 India.
authors: Deepansh
authors: D
authors: Sharma
authors: Department of Microbiology, Kurukshetra University, Kurukshetra, 136 119 INDIA.
authors: Baljeet Singh
authors: BS
authors: Saharan
authors: Division of Microbiology and Immunology, Vector Control Research Center, Puducherry, 605006 India.
authors: Nikhil
authors: N
authors: Chauhan
authors: Department of Chemistry, Kurukshetra University, Kurukshetra, 136 119 India.
authors: Suresh
authors: S
authors: Procha
authors: Department of Chemistry, Kurukshetra University, Kurukshetra, 136 119 India.
authors: Sohan
authors: S
authors: Lal
keywords: Biosurfactant; Cytotoxicity; Glycolipids; Lactic acid bacteria; Probiotic