Identification and Implications of Trimethyl-n-Alkylbenzenes in Marine Oils from the Deep Tarim Basin

Figure 3

m/z 91+92, 105+106, 119+120, and 133+134 mass chromatograms (full scan mode) of the aromatic fractions from the oils (a–d) DH1C and (e–h) LN14O showing the distributions of n-alkylbenzene series. The labels (m, p, and o) in (b) and (f) denote the meta-, para-, and ortho isomers of methyl-n-alkylbenzene. Numbers 1–5 in (c) and (g) denote 3,5-, 2,5-, 2,4-, 3,4-, and 2,3-dimethyl isomers of dimethyl-n-alkylbenzene. The 2,6-dimethyl isomer elutes shortly after the 3,4-dimethyl isomer and exists in very low abundance (structure assignment was made according to the result of Ellis et al. [37]). Filled circles and unfilled triangles in (d) and (h) indicate AIPs and AAs, respectively.