To study the composition of "Tian Op" smoke, gas chromatography-olfactometry, aroma extract dilution analysis (AEDA) and gas chromatography-mass spectrometry (GC-MS) were applied to identify the potent odorants in smoked flavoring using three trapping solvents: propylene glycol, glycerol and water. Based on the results of AEDA-calculated odor-activity values, the predominant odorants in the Tian Op flavoring were vinyl ketones (C<inf>5</inf>-C<inf>9</inf>), n-aldehydes (C<inf>5</inf>-C<inf>11</inf>), (E)-2-unsaturated aldehydes (C<inf>8</inf>-C<inf>11</inf>) and ω-1 -unsaturated aldehydes (C<inf>8</inf> and C<inf>9</inf>). These components were found in the highest quantities when propylene glycol was used as the trapping solvent, followed by glycerol and water, respectively.
