Dispersive liquid-liquid microextraction (DLLME) coupled with high-performance liquid chromatography (HPLC) -UV detection was applied for the extraction and determination of abamectin (avermectin (B 1b ) and avermectin (B 1a )) in fruit juice samples. An appropriate mixture of ethanol (as the disperser solvent) and carbon tetrachloride (as the extraction solvent) was injected rapidly into a sample containing abamectin. After extraction, phase separation was performed by centrifuging the mixture and the sedimented phase was analyzed by HPLC-UV. Some effective parameters on the extraction, such as types and volumes of extractant and disperser solvents and salt effect were investigated and optimized. Under the optimum conditions, (extractant solvent: carbon tetrachloride, 30.0 µL; disperser solvent: ethanol, 1.0 mL and without salt addition), the calibration graphs were linear in the range of 2.5 -500 µg L -1 and 1.0 -500 µg L -1 with the detection limits of 0.8 µg L -1 and 0.3 µg L -1 for B 1b and B 1a in fruit juice samples, respectively. The relative standard deviation (R.S.D., n = 5) for the extraction and determination of 50.0 µg L -1 of B 1b and B 1a in the fruit juice samples were 9.2 and 7.8%, respectively. The results show that DLLME is a very simple, rapid, sensitive and efficient analytical method for the determination of abamectin in fruit juice samples and satisfactory results were obtained.
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