| Autor: |
Mu¨ller, K.-Dieter, Schmid, Ernst N., Kroppenstedt, Reiner M. |
| Zdroj: |
Journal of Clinical Microbiology; September 1998, Vol. 36 Issue: 9 p2477-2480, 4p |
| Abstrakt: |
ABSTRACTThe MIDI automated Microbial Identification System (MIS) uses gas chromatography (GC) analysis of whole-cell fatty acid methyl esters (FAMEs) between 9 and 20 carbons in length to characterize a wide range of bacterial genera and species, including mycobacteria. Mycolic acid cleavage products (MACPs) with chain lengths of C22to C26are not released by MIDI sample preparation of mycobacteria. Therefore, the MIS library search report often matches several mycobacterial species without any significant difference in the similarity indices. The problem is solved by adding trimethylsulfonium hydroxide (TMSH) instead of sodium sulfate in the last step of sample preparation, thus allowing the identification of MACPs in addition to FAMEs. Only one GC run parameter has to be changed: the temperature program must be extended from 260 to 310°C. The MIS library search report for the identification of bacteria is not disturbed by TMSH. The combination of conventional library search report with the information of typical MACP patterns yields significantly better discrimination of mycobacterial species than the MIDI method allows. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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