Abstract
In this study, a simple and reliable sample preparation method based on an efficient version of homogeneous liquid-liquid extraction combined with dispersive liquid-liquid microextraction solidification of floating organic drop has been introduced to analyze some pesticide residues in fruit and fruit juice samples with gas chromatography-flame ionization detection. Under the optimum experimental conditions, limits of detection and quantification were in the ranges of 0.20–0.60 and 0.66–2.0 μg L−1, respectively. The repeatability of the method was good and the relative standard deviations were less than 7 % for intra- (n = 6) and inter-day (n = 4) precisions at a concentration of 50 μg L−1 of each analyte. High enrichment factors (3265–3728) and extraction recoveries (82–93 %) were obtained. Finally, the method was applied for determination of pesticides in the selected samples and chlorpyrifos was found in strawberry at ng g−1 concentration. Furthermore, no filtration was used in the cases of the fruit samples.
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Abbreviations
- DLLME:
-
Dispersive liquid-liquid microextraction
- EF:
-
Enrichment factor
- ER:
-
Extraction recovery
- FID:
-
Flame ionization detection
- GC:
-
Gas chromatography
- HLLE:
-
Homogeneous liquid-liquid extraction
- LLE:
-
Liquid-liquid extraction
- LOD:
-
Limit of detection
- LPME:
-
Liquid-phase microextraction
- LOQ:
-
Limit of quantification
- MS:
-
Mass spectrometry
- RSD:
-
Relative standard deviation
- SFO:
-
Solidification of floating organic drop
- SPE:
-
Solid-phase extraction
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Acknowledgments
The financial support from University of Tabriz is acknowledged.
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Mir Ali Farajzadeh has received research grants from University of Tabriz.
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Mir Ali Farajzadeh declares that he has no conflict of interest. Ali Sadeghi Alavian declares that he has no conflict of interest. Masoumeh Sattari Dabbagh declares that she has no conflict of interest.
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Farajzadeh, M.A., Sadeghi Alavian, A. & Sattari Dabbagh, M. Development of an Efficient Sample Preparation Method Based on Homogeneous Liquid-Liquid Extraction Combined with Dispersive Liquid-Liquid Microextraction Solidification of Floating Organic Drop for Trace Analysis of Pesticide Residues in Fruit and Fruit Juice Samples. Food Anal. Methods 12, 2730–2741 (2019). https://doi.org/10.1007/s12161-019-01628-y
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DOI: https://doi.org/10.1007/s12161-019-01628-y