Propofol (purity 99.9%) was obtained from Incepta Pharmaceuticals Ltd. (Dhaka, Bangladesh). Zanthoxylum rhetsa seed oil (ZRO) was collected by a steam distillation process from naturally obtained seeds (no organic solvent was used). Medium-chain triglycerides (carbon chain length 8–12), Miglyol 810 (M810), and corn oil (CO) were purchased from Sasol Germany GmbH (Werk, Witten, Germany). Capmul MCM (C10) mono/diglycerides of capric acid were purchased from Abitec Corp. Janesville, USA. Maisine 35–1 (long-chain monoglycerides) was obtained from Gattefosse SAS, (Saint-Priest, France). Kolliphor ELP and Kolliphor HS15 were purchased from BASF, Ludwigshafen, Germany. Tween 80 (polyoxyethylene sorbitan monooleate) was obtained from Sigma Aldrich, USA. HPLC-grade acetonitrile, methanol, formic acid, and phosphoric acid were obtained from BDH Chemicals Ltd., Poole, UK. Milli-Q water was obtained through a Milli-Q Integral Water Purification System (Millipore, Bedford, MA). All other reagents were of analytical grade and used without further purification.
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