## 3 Experimental Section
### Solid Phase Micro-Extraction Coupled with MDGC-MS  
Three-phase Stableflex SPME fibers (50/30 \(\upmu\)m DVB/CAR/PDMS, 2 cm, 24 Ga) were purchased from Supelco (Poznan, Poland). The fiber was conditioned at 250 \({}^{\circ}\)C for 1 h before analysis. All samples were extracted at 4 \({}^{\circ}\)C using a Shimadzu AOC-5000 plus auto-sampler fitted with a stack cooler set. Heart cut-MDGC-MS analyses were performed using a Shimadzu GC-2000 plus with a split/splitless injector coupled to a Shimadzu QP 2010 GC-mass spectrometer using a Dean switch. The first GC column was a RtX-wax, 30 m in length, 0.25 mm ID, and 0.5 \(\upmu\)m of film thickness (Crossbond(r) Carbowax(r) polyethylene glycol, Restek Corporation, Bellefonte, PA, USA). Method parameters for the first GC oven were as follows; injector temperature at 230 \({}^{\circ}\)C. The column oven was held at 65 \({}^{\circ}\)C for 3 min, and then increased to 145 \({}^{\circ}\)C at 4 \({}^{\circ}\)C\(\cdot\)min\({}^{-1}\), at which the temperature was kept constant for 10 min, then further increased to 230 \({}^{\circ}\)C at 4 \({}^{\circ}\)C\(\cdot\)min\({}^{-1}\) and held at this temperature for 15 min. Flow control mode was set using pressure mode at a constant 235 kpa, switching pressure was 200 kpa. The cut windows for further separation on second GC column were: 7.85-8.50 min; 12.00-14.00 min; 14.25-15.80 min; 15.85-17.25 min, 18.50-21.25 min; 22.00-26.00 min; 26.75-30.00 min, 33.00-38.00 min, 38.50-45.00 min. The second GC contained two columns connected in sequence. An Rt(r)-\(\beta\)DEXsm connected with Rt(r)-\(\beta\)DEXse (alkylated \(\beta\)-cyclodextrintrin in cyanopropyl-dimethyl polysiloxane, Restek Corporation), 60 min length, 0.25 mm ID, and 0.25 \(\upmu\)m of film thickness. The second oven program began at the sametime as the first as is as follows; the column oven was held at 40 \({}^{\circ}\)C for 10 min, then increased to 125 \({}^{\circ}\)C at 3.0 \({}^{\circ}\)C\(\cdot\)min\({}^{-1}\) holding for 10 min, followed by an increase of 3.0 \({}^{\circ}\)C\(\cdot\)min\({}^{-1}\) to 135 \({}^{\circ}\)C, then further increased to 170 \({}^{\circ}\)C at 2.0 \({}^{\circ}\)C\(\cdot\)min\({}^{-1}\), held for 2 min, finally increased to 230 \({}^{\circ}\)C at 15.0 \({}^{\circ}\)C min\({}^{-1}\) and held at this temperature for 8 min. The total run time was 83.17 min. GCMS transfer line temperature was 230 \({}^{\circ}\)C; ion source temperature was 200 \({}^{\circ}\)C. Spectra were acquired using electron impact ionization (EI, 70 eV) in a full scan mode from 3 min to 83 min with scan range of _m/z_ 33-303 Da at 0.20 sec event time. Detector was run at a variable gain factor for each compound from 0.80 to 1.35.  
Identification of all chiral monoterenes was based on the comparison of retention time and mass spectra with authentic standards and NIST11 database. Quantitation of all compounds was based on calibration curves calculated from peak area ratios (peak area of the monoterene standard/peak area of the corresponding isotope standard) were plotted against the concentration ratios (monoterpene standard/the corresponding isotope standard) for six series of monoterenes concentrations.