A high-throughput approach for the determination of pesticide residues in cucumber samples using solid-phase microextraction on 96-well plate

Bagheri, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.aca.2012.06.001
  3. Abstract:
  4. A high-throughput solid-phase microextraction (SPME) on 96-well plate together with gas chromatography-mass spectrometry (GC-MS) was developed for the determination of some selected pesticides in cucumber samples. Pieces with the length of 1.0cm of silicon tubing were precisely prepared and then coated on the end part of stainless steel wires. The prepared fibers were positioned in a home-made polytetrafluoroethylene (PTFE)-based constructed ninety-six holes block to have the possibility of simultaneous immersion of the SPME fibers into the center of individual wells. Pesticides such as diazinon, penconazol, tebuconazol, bitertanol, malathion, phosalone and chlorpyrifos-methyl were selected for their highly application in cucumber field. The performances of the SPME fibers, such as intra and inter-fibers reproducibility, were evaluated and the results showed a good similarity in extraction yields. A volume of 1mL of the aquatic supernatant of the cucumber samples was transferred into the 96-well plate and the array of SPME fibers was applied for the extraction of the selected pesticides. The important parameters influencing the whole extraction process including, organic solvent percent, salt addition, dilution factor, stirring rate and extraction time were optimized. The inter- and intra-day RSD% were found to be less than 15.4%. Limits of detection (LOD) and limits of quantification (LOQ) were below 60 and 180μgkg-1, respectively. The coefficient of determination was satisfactory (r2>0.99) for all the studied analytes. The developed method was successfully applied to the monitoring of several samples gathered from local markets
  5. Keywords:
  6. 96-Well plate ; Solid-phase microextraction ; Cucumber analysis ; High-throughput ; Fibers ; Gas chromatography ; Organic solvents ; Pesticides ; Bitertanol ; Chlorpyrifos methyl ; Dimpylate ; Malathion ; Organic solvent ; Penconazol ; Pesticide residue ; Phosalone ; Sodium chloride ; Tebuconazol ; Unclassified drug ; Article ; Cucumber ; Dilution ; High throughput screening ; Limit of detection ; Limit of quantitation ; Mass fragmentography ; Priority journal ; Process development ; Process optimization ; Reproducibility ; Residue analysis ; Solid phase microextraction ; Gas chromatography-mass spectrometry ; High-throughput screening assays ; Pesticide Residues ; Time Factors ; Cucumis sativus
  7. Source: Analytica Chimica Acta ; Volume 740 , 2012 , Pages 36-42 ; 00032670 (ISSN)
  8. URL: http://www.ncbi.nlm.nih.gov/pubmed/22840648