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Polydimethylsiloxane/Ionic Liquid (PDMS/IL) Sponge Used in Headspace Solid Phase Extraction Coupled with GC-MS for Rapid Analysis of Essential Oil in Lavender.

A headspace (HS) solid phase extraction based on polydimethylsiloxane (PDMS)/ionic liquid (IL) sponge was developed for the extraction of lavender essential oil. The PDMS after loading of 1-butyl-3-methylimidazolium tetrachloroferrate ([BMIM]FeCl4 ) with high surface area and excellent adsorption capacity were successfully applied in the solid phase extraction process. Microwave distillation (MD) coupled with HS-PDMS/[BMIM]FeCl4 extraction following GC-MS was proposed. Various experimental parameters were studied. The optimal conditions were: [BMIM]FeCl4 as the optimal ionic liquid, 1:5 as the volume ratio of ionic liquid to ethanol, extraction solvent of n-hexane, 600 W microwave power and 12 min irradiation time. The limits of detection and quantification of the analytic compounds were in the ranges 4.00-16.32 ng and 10.00-40.00 ng, respectively. The intra-day and inter-day precisions were in the ranges 0.37-1.94% and 1.20-2.45%, respectively. Under the optimized conditions, 13 samples of three lavender varieties were analyzed and a total of 40 compounds were identified. Lavender varieties were distinguished by PCA. The results showed that MD-HS-PDMS/IL-GC-MS is a novel, simple, and sensitive method for the determination of essential oil in complex plant samples.