Microwave‐assisted ionic liquid‐based micelle extraction combined with trace‐fluorinated carbon nanotubes in dispersive micro‐solid‐phase extraction to determine three sesquiterpenes in roots of Curcuma wenyujin

Abstract

Germacrone, furanodiene and β-elemene are the representative bioactive compounds in Curcuma species. The conventional extraction methods of these three sesquiterpenes are usually time-consuming and require a large volume of hazardous organic solvents. Thus, a fast and reliable method for extracting these sesquiterpenes from Curcuma plant is required urgently. To establish a novel and simple extraction method for quantitative analysis of small amounts of sesquiterpenes in C. wenyujin plant. A method using microwave-assisted ionic liquid-micelle extraction combined with dispersive micro-solid-phase extraction (DMSPE) has been proposed for the extraction of three sesquiterpenoids in Curcuma plant. Fluorinated carbon nanotubes (FCNTs) were used as an adsorbent in DMSPE for the first time. Parameters concerning the microwave-assisted extraction (MAE) conditions and the DMSPE were investigated and evaluated to achieve optimum extraction efficiency of target analytes. The final conditions of ionic liquid-micelle based MAE were selected to be 0.25M of 1-decyl-3-vinylimidazolium bromide as the extraction solvent, microwave irradiation for 10min at 60°C. And the optimal DMSPE conditions were found to be 2μg/mL of FCNTs as the adsorbent, extraction time of 2min and 100μL of acetonitrile as the elution solvent. The developed method exhibited good linearities (R > 0.9990), high repeatability and recoveries. The proposed method has been successfully applied in determination of sesquiterpenes in C. wenyujin samples. The work shows a potential in analysing small amounts of sesquiterpenes in complex samples and represents the first attempt of using FCNTs as an adsorbent for the microextraction mode.