Dispersive liquid-liquid microextraction followed by gas chromatography-mass spectrometry for the determination of pesticide residues in nutraceutical drops.

An economical and rapid method has been developed using dispersive liquid-liquid microextraction (DLLME) coupled with gas chromatography-mass spectrometry to extract and determine forty pesticides in nutraceutical drops containing alcohol. Parameters affecting the DLLME performance, such as solvent selection and volume of extractive and dispersive solvent, salt effect, pH, mixing type and extraction time, were studied. Tetrachloroethane was the selected extraction solvent.