Analysis of terpanes in biodegraded oils from China using comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry.

Highlights: [•] First report of GC×GC–TOFMS data of biodegraded oils from China. [•] Most terpanes were well separated and recognized. [•] New compounds were found, especially a C27-tetracyclic terpane or C27-17, 21-secohopane. [•] The compound could be used as a new geochemical parameter to characterize the biodegradation degree. [ABSTRACT FROM AUTHOR]