Clover Technology Group, Inc. คือผู้เชี่ยวชาญด้านการผลิตเครื่องมือและ อุปกรณ์ทดสอบสำหรับงานทางด้านความปลอดภัยอาหารและการตกค้างของยาปฏิชีวนะ ในสัตว์, อาหารสัตว์ และ ผลิตภัณฑ์จากสัตว์ (Food Safety and Veterinary drug residues)

Solid-phase extraction (SPE) is a widely used sample-preparation technique for the isolation of selected analytes, usually from a mobile phase (gas, fluidor liquid).The analytes are transferred to the solid phase where they are retained for the duration of the sampling process. The solid phase is then isolated from the sample and the analytes recovered by elution using a liquid or fluid, or by thermal desorption into thegas phase. SPE is now the most common sample purification technique in many areas of chemistry including environmental, pharmaceutical, clinical, food and industrial chemistry sectors.

QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe), a sample preparation method proposed by Michelangelo Anastassiades and co-workers in 2003, has been adopted as official procedures for multiresiduals pesticide monitoring in Europe, the U.S. and China.