Abstract
The n-hexane extracts of 25 g Polygonum orientale L. (Polygonaceae) flowers were analysed by thin-layer chromatography, gas chromatography–flame ionization detector (GC-FID) and gas chromatography–mass spectrometry (GC-MS) and revealed 20 long-chain alkanes from n-C15 to n-C36 and 13 free fatty acids from C12:0 to C21:0, accounting for 5784.52 ± 15.03 and 474.29 ± 3.63 μg, respectively. Octadecane and palmitoleic acid were the predominant alkane and free fatty acid in flower surface waxes, representing 691.14 ± 8.46 and 102.22 ± 1.50 μg, respectively. Floral volatiles were collected by a push–pull technique. Twenty-six compounds were identified by GC-MS and GC-FID analyses. Methyl jasmonate was predominant, followed by 1-octadecanol, representing 753.69 ± 31.76 and 294.09 ± 2.92 μg, respectively.
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