title: [Purification and identification of surfactin isoforms produced by Bacillus subtilis B2 strain].
abstract: Crude lipopeptide was extracted with methanol from the pellet which was precipitated with 6 mol/L HCl from the culture medium of Bacillus subtilis B2 strain. The crude lipopeptide was purified by gel filtration on Sephadex LH-20 column, the obtained product was referred to as sub-pure lipopeptide. The MALDI-TOF mass spectrum showed that B2 produced only lipopeptide surfactin. Sub-pure lipopeptide was run on muRPC C2/C18 column by HPLC SMART SYSTEM with aim at separation of surfactin isoforms. The surfactin isoforms fractions was detected by MALDI-TOF-PSD mass spectrometry, results indicated that the surfactin isoforms of B2 strain was cyclic lipodecapeptide L-Glu-L-Leu-D-Leu-L-Val-L-Asp-D-Leu-L-Leu containing fatty acid with a side chain length of 13, 14 and 15 carbon atoms.
authors.affiliation: Key Laboratory of Monitoring and Management of Plant Diseases and Insects of Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China. gaoxuew@yahoo.com
authors.forename: Xuewen
authors.initials: X
authors.lastname: Gao
authors.forename: Shiyi
authors.initials: S
authors.lastname: Yao
authors.forename: Pham
authors.initials: P
authors.lastname: Huong
authors.forename: Vater
authors.initials: V
authors.lastname: Joachim
authors.forename: Jinsheng
authors.initials: J
authors.lastname: Wang
mesh_terms: D001412:Bacillus subtilis / Q000737:chemistry* / Q000378:metabolism; D055666:Lipopeptides / Q000737:chemistry* / Q000302:isolation & purification* / Q000378:metabolism; D010456:Peptides, Cyclic / Q000737:chemistry* / Q000302:isolation & purification* / Q000378:metabolism; D020033:Protein Isoforms / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D055666:Lipopeptides; D010456:Peptides, Cyclic; D020033:Protein Isoforms; C009365:surfactin peptide