2.2. Quantification of essential oils
Quantification was performed using GC coupled with flame ionisation detection (GCFID) .The sensitivity of several authentic reference standards was calculated relativeton-decane.Equal masses of n-decane and authentic reference standard were dissolved in DCM before injection.n-Decane was then used as an internal marker forfurtherquantification.Lessabundantcompoundswere sub-quantified using sensitivity values from compounds with structure as similar as possible to the target compound.
To prepare for analysis,equal masses of essential oil and n-decane were dissolved in DCM. Analyses were performed using a Varian 3300 gas chromatograph. Separation was accomplished with a Phenomenex ZB5 MS column(30m0.25 mmi.d.,0.25 mm phase thickness).Operating conditions were as follows.
Injector: split turned on;temperature:250 ℃; carrier gas:helium, 4.5ml/min, constant flow; column temperature,initially 60 ℃, 60–200 C at5 1℃/min, 200 ℃ hold for2min.
2.2. Quantification of essential oilsQuantification was performed using GC coupled with flame ionisation detection (GCFID) .The sensitivity of several authentic reference standards was calculated relativeton-decane.Equal masses of n-decane and authentic reference standard were dissolved in DCM before injection.n-Decane was then used as an internal marker forfurtherquantification.Lessabundantcompoundswere sub-quantified using sensitivity values from compounds with structure as similar as possible to the target compound.To prepare for analysis,equal masses of essential oil and n-decane were dissolved in DCM. Analyses were performed using a Varian 3300 gas chromatograph. Separation was accomplished with a Phenomenex ZB5 MS column(30m0.25 mmi.d.,0.25 mm phase thickness).Operating conditions were as follows.Injector: split turned on;temperature:250 ℃; carrier gas:helium, 4.5ml/min, constant flow; column temperature,initially 60 ℃, 60–200 C at5 1℃/min, 200 ℃ hold for2min.
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