抄録
Many halophilic archaea produce a characteristic C25-C20 isoprenoidal diether as a lipid-core portion of their body. This compound has a possibility for the biomarker to indicate a hypersaline environment. However, there have been a few experiments were performed for this compound in natural samples. In the present study, analytical methods of isoprenoidal lipid-core produced by an "ordinal" halophilic archaea Natrinema pallidum were established by ESI-MS and GC-MS. Furthermore, the compositional change for the C25-C20 diether and C20-C20 diether (archaeol), which simultaneously produced by the microorganism, was investigated. In higher temperature and higher salt concentration, C25-C20 diether tends to produce more than lower temperature and concentration. This may be adaptation to extreme environment of this microorganism.
