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

Analyzing hydrocarbon fractions in crude oils by two-dimensional gas chromatography/time-of-flight mass spectrometry under reversed-phase column system

“…Among these compounds, i-C 19 (Pr) and i-C 20 (Ph) are the most abundant and have the most significant geochemical implications [20,33]. The content of i-C 17 is the lowest.…”

“…Normal-phase system has a non-polar column for the first dimension and a polar column for the second dimension, whereas a reversed-phase column system changes the sequence of column connection [16,17,19,20]. Given that a wide range of boiling points for hydrocarbon fractions in crude oils (including saturated and aromatic hydrocarbons), normal-phase column system has been widely used with effective separation of hydrocarbons, especially with high molecular weight (HMW, the compounds generally between C 25 -C 33 ) [21] and certain polarity [22][23][24][25][26].…”

Insight into unresolved complex mixtures of aromatic hydrocarbons in heavy oil via two-dimensional gas chromatography coupled with time-of-flight mass spectrometry analysis

“…Currently, many previous studies reported the constituents of UCMs in aromatic hydrocarbons focus mainly on toxic contaminants in marine organisms [29][30][31]. In geological sample, more reports have been paid to the analysis of UCMs of saturated hydrocarbons, known aromatic compounds, or heterocyclic compounds such as sulfur and nitrogen containing compounds [32][33][34][35][36][37][38]. Other compounds found in aromatic UCMs, on the other hand, are still lacking sufficient attention.…”

Inlet backflushing device for the improvement of comprehensive two dimensional gas chromatographic separations

“…GC × GC is considered an established separation technique and for the last decade focus has shifted away from the development of modulation technology to applying the technique to an ever increasing number of analytical challenges. Fields in which GC × GC applications are popular include petroleum and petrochemicals [6][7][8][9][10][11][12][13][14][15][16]; food, flavours and fragrances [17][18][19][20][21][22][23][24][25][26][27][28][29][30]; metabolomics [31][32][33][34][35][36][37][38][39][40][41][42] and environmental analysis [43][44][45][46][47][48][49]. Although GC × GC has never been more widespread, there are some applications that remain challenging for a chromatographer to perfect.…”