Abstract

The isoprenoid alkanes present in a seep oil from Costa Rica have been examined using gas chromatography and mass spectrometry. In addition to the predominance of the C 16 and C 18-C 20 regular isoprenoid alkanes, the C 21 and C 23-C 25 regular isoprenoid alkanes were identified. The C 26, C 28 and C 30 regular isoprenoid alkanes were tentatively identified. No evidence for the regular C 17, C 22 or C 27 isoprenoid alkanes was found. The compounds 3,7,11- trimethyltetradecane and 3,7,11-trimethylhexadecane were tentatively identified. It is suggested that a higher regular isoprenoid structure (or structures) is required in addition to phytol to account for the distribution of isoprenoid alkanes.

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