title: Production and characterization of surfactin-type lipopeptides as bioemulsifiers produced by a Pinctada martensii-derived Bacillus mojavensis B0621A.
abstract: Bacillus mojavensis B0621A was isolated from the mantle of a pearl oyster Pinctada martensii collected from South China Sea. Semi-purified surfactins (225 mg L(-1)) were obtained by acid precipitation and vacuum flash chromatography. The component of the semi-purified surfactins was preliminarily analyzed by liquid chromatography mass spectrometer system, and the results showed that all these surfactins could be a group of homologues. Eight surfactin homologues were isolated and afforded by reversed phase high-performance liquid chromatography. Furthermore, their structure was characterized by mass spectrometry analysis combined with nuclear magnetic resonance spectroscopy techniques. These surfactins shared seven amino acids as peptide backbone and a saturated β-hydroxy fatty acid chain residue (from C13 to C15), differed each other from peptide sequence in the position of Leu7 or Val7. All these surfactins had significant activity and stability of emulsification under various pH (from 7.0 to 12.0), temperature range (from 20 to 115 °C) and sodium chloride concentration (from 2.5 to 20.0 %, w/v). Taken all together, these results indicated that B. mojavensis B0621A have potential to be an alternative source as a biological-derived emulsifying agent.
authors.affiliation: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China.|Graduate University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Zongwang
authors.initials: Z
authors.lastname: Ma
authors.affiliation: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China. hujc@iae.ac.cn.
authors.forename: Jiangchun
authors.initials: J
authors.lastname: Hu
mesh_terms: D000473:Alkanes / Q000737:chemistry; D000818:Animals; D001407:Bacillus / Q000302:isolation & purification / Q000378:metabolism*; D045703:Emulsifying Agents / Q000737:chemistry / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D055666:Lipopeptides / Q000096:biosynthesis* / Q000737:chemistry; D049911:Pinctada / Q000382:microbiology*; D012965:Sodium Chloride / Q000737:chemistry; D013696:Temperature
chemical_list: D000473:Alkanes; D045703:Emulsifying Agents; D055666:Lipopeptides; D012965:Sodium Chloride; C007932:n-hexadecane
keywords: Bacillus mojavensis; Bacillus surfactins; Bioemulsifiers; Chemical identification; Emulsification activity