The volatile aroma components of SEO were measured based on a previous study [4 (link)]. Briefly, 1 μL of essential oil was injected at a split ratio of 1:50 into an Agilent 7890A GC-FID system (Agilent J&W, Santa Clara, CA, USA). The volatile aroma components were separated using an Agilent J&W DB-Wax column (60 m × 0.25 mm i.d., 0.25-μm film thickness) under a helium stream at a flow rate of 32 cm/s. The initial oven temperature was 40 °C, which was maintained for 2 min, then increased to 200 °C at a rate of 2 °C/min, and finally held for 38 min. The GC injector and FID were set at 250 °C. Aroma components were identified based on linear retention indices (RIs) upon measurement of the homologous series of C7–C30 alkanes, followed by comparison of the MS patterns of the peak with MS data from the National Institute of Standards and Technology (NIST) MS Library, Version 2008, and MS patterns of authentic standards. The MS patterns of the peaks were acquired using an Agilent 5975C MS system under the following conditions: both ion source and interface temperatures were set at 230 °C, electron impact ionization at 70 eV, and mass acquisition range of 29–450 amu. The composition was expressed as the relative concentration of the FID peak area response. All analyses were performed in triplicate.