A novel and
rapid ionic liquid-based
dispersive liquid–liquid
microextraction (IL-DLLME)
method com- bined with liquid chromatography
and a fluorescence detector for the analysis of ochratoxin A in rice wines is presented.
The following parameters were systematically investigated:
type and volume of ionic liquid,
volume of dispersive solvent,
salt addition, sample pH,
and vortex time.
Rice wine samples were first diluted to 18% alcohol with deionized water,
and the pH was adjusted to 3.0. A DLLME procedure was followed that included IL ([HMIM][PF6]) and
ethanol as the extraction and
dispersive solvents,
respec- tively.
Under the optimized experimental conditions, good linearity was obtained with a correlation coef- ficient (r) of 0.9998 and a limit of detection (LOD) of 0.04 lg L1. The recoveries ranged from 75.9% to 82.1% with an RSD below 10.4%. The proposed method was