Identification of (S)-11-cycloheptyl-4-methylundecanoic acid in acylphosphatidylglycerol from Alicyclobacillus acidoterrestris
作者:Tomáš Řezanka、Lucie Siristova、Karel Melzoch、Karel Sigler
DOI:10.1016/j.chemphyslip.2009.02.001
日期:2009.6
A method is described for the identification of molecular species of acylphosphatidylglycerols containing a branched cyclo fatty acid ((S)-11-cycloheptyl-4-methylundecanoic acid; brc19:0) from Alicyclobacillus acidoterrestris and its identification as picolinyl ester by means of GC-MS. The combination of TLC, negative RP-HPLC-ESI-MS/MS, enzymatic hydrolysis, and CC-MS was used to identify unusual molecular species of acylphosphatidylglycerols with cyclic and branched FA. The acid, brc19:0, was also synthesized to unambiguously confirm its structure. According to feeding experiments with (13)C-labeled propionate, the C(3) internal unit (branched methyl) of brc19:0 is assembled from propionate and not from methionine. (C) 2009 Elsevier Ireland Ltd. All rights reserved.