2.3. Sample preparation for SPME fiberThe conditioning of Solid Phase Microextraction (SPME) fiber usingSupelco No. 57324-U fused with silica, 100 μm poly-dimethyl siloxane,red/plain, was done at 250 C for 30 min before each sample injections.The different essential oils were placed in 10 mL vial and closed by usingthe septum. The aroma volatiles of each essential oils were collected byusing the Stable-flex fiber which was conditioned properly for 4 h. Thesampled SPME device was then insert into the injector of the GC-MSinstrument