Abstract
Mycolic acids from twelve Nocardia species were analyzed for structure using capillary gas chromatography and mass spectrometry. This high-resolution procedure permitted good separation of the trimethylsilyl (TMS) ether derivatives of mycolic acid methyl ester according to the total number of carbon and double bonds. The profiles of the mycolic acid molecular species were used as models to illustrate the difference in the structures of each species, even in the case of N. asteroides complex; N. asteroides, N. farcinica and N. nova. Although N. asteroides and N. farcinica had similar lengths of carbon skeleton, i.e., 51.9–53.7 was the average carbon number (Av.Nc.), they had different compositions of unsaturated acids. Mycolic acids from N. asteroides were composed of abundant saturated acids and less than 1% tetraenoic acids; mycolic acids from N. farcinica were composed of unsaturated acids, which were composed of abundant dienoic acids, 2–12% of tetraenoic acids and a trace of pentaenoic acids. In contrast, Av.Nc. of mycolic acids from N. nova were 55.7–56.3, which were relatively longer than those from N. asteroides or N. farcinica. Regarding the characteristics of the structure of α-branch, major components were C16:0 and C18:0 for N. asteroides 23206 T, and C16:0 and C14:0 for N. farcinica 23157 T, respectively. The presence of monounsaturated α-branch (C18:1 and C16:1) was characteristic of N. nova.
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