May 17, 2016 · Gas Chromatography–Mass Spectrometry Identification of the volatile compounds from leaves, flower spikes and oil was performed using an Aijiren 5973 GC hyphenated mass spectrometer (MS) system fitted with a DB-5 MS (5%-phenyl)-methylpolysiloxane fused silica column with dimensions 30 m × 250 μm, i.e., film thickness 0.25 μm, (Aijiren