title: A thin-layer chromatographic method for separating methyl esters of mycobacterial mycolic acids.
abstract: A two-dimensional thin-layer chromatographic method was developed which allowed separation of the different mycobacterial mycolic acids as methyl esters. Dichloromethane (once) and petroleum ether:acetone (95:5, v/v twice or three times) were used as solvents. Alkaline saponification of freeze-dried cells followed by methylation of the mycolic acids using iodomethane gave satisfactory results, whereas methylation using boron trichloride-methanol complex or trans-esterification through direct acid methanolysis was found to degrade epoxy-mycolates. The chromatographic method developed here is rapid and informative, and should prove valuable in routine mycobacterial differentiation.
mesh_terms: D002855:Chromatography, Thin Layer / Q000379:methods*; D004951:Esterification; D008745:Methylation; D009161:Mycobacterium / Q000032:analysis*; D009171:Mycolic Acids / Q000302:isolation & purification*
chemical_list: D009171:Mycolic Acids