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Total ion chromatogram of volatile compounds from Cirsium setidens Nakai extracted using solid-phase microextraction Arrows. (a) Carbon wide range/polydimethylsiloxane (CWR/PDMS), (b) divinylbenzene/PDMS (DVB/PDMS), (c) PDMS, and (d) polyacrylate (PA). The peak numbers correspond to the compounds as follows: (1) 2,2,4,6,6-Pentamethylheptane, (2) 1-Penten-3-ol, (3) 2-Pentylfuran, (4) 3,5-Octadien-2-one, (5) 1-Methylcycloheptanol, (6) β-Cyclocitral, and (7) trans-β-Ionone.
