Solvent free method for determination and analysis of volatile components from Stachys lavandulifolia with Periodic mesoporous organosilica based on alkylimidazolium ionic liquid

A microwave-assisted headspace solid phase microextraction (MA-HS-SPME) method with a periodic mesoporous organosilica based on alkylimidazolium ionic liquid (PMO-IL) was prepared and used as a highly porous fiber coating material was successfully applied to the study of the essential oil composition of Stachys lavandulifolia. The sample was irradiated by microwave radiation and its volatile components were collected by the fiber from the sample headspace and directly injected into a GC-MS injection port for analysis. A simplex method was used for optimization of three different parameters affecting the efficiency of the extraction. Under the optimized conditions (i. e. sample weight, 2 g, extraction time, 2.0 min and microwave power 350 W), the PMO-IL nanonporous fiber could efficiently adsorb volatile components of Stachys lavandulifolia. The suggested technique, relative to HD can equally be used to monitor all the sample components easily, but it will require less sample quantity and duration. A few experiments based on the simplex method proved it to be a fast while efficient method that can be used to optimize micro-extraction conditions.