Fig. 4

VOC chromatograms of A. majus flowers after adding standards to the headspace. a Chromatogram of a control flower. b–d chromatograms after adding 25, 50 and 100 mg/L of the standards. The standards ocimene, acetophenone, methyl benzoate and methyl cinnamate were added directly to the headspace containing flowers from the same plant at the same developmental stages. e Overlaid view of the methyl benzoate peaks from chromatograms (a–d) (RT 8.6)