Time of flight secondary ion mass spectrometry (ToFSIMS) of a number of hopanoids

Time of flight secondary ion mass spectrometry (ToFSIMS) has been applied t o a number of bacterial hopanoids in an attempt to characterise these geolo gically important molecules in situ by a surface sensitive technique. Our r esults show that these molecules can be detected using this instrumentation to a high degree of mass accuracy. We believe that ToFSIMS can, therefore, be used to identify these molecules in environmental samples where sample size may be an issue and contraindicate the use of more traditional techniq ues such as GC-MS. (C) 2001 Published by Elsevier Science Ltd.