An Applicable Strategy for Improvement Recovery in Simultaneous Analysis of 20 Pesticides Residue in Tea |
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Authors: | Shahram Shoeibi Maryam Amirahmadi Hossein Rastegar Roya Khosrokhavar Amin Mousavi Khaneghah |
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Affiliation: | 1. Authors Shoeibi, Amirahmadi, Rastegar, Khosrokhavar are with Food and Drug Laboratory Research Center and Food and Drug Reference Control Laboratories Center;2. Food and Drug Organization, , MOH & ME, Tehran, I. R. Iran;3. Author Khaneghah is with Dept. of Food Science and Technology, Islamic Azad Univ., Science and Research Branch, , Tehran, Iran |
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Abstract: | It is important to have a reliable method to analyze pesticides in tea, a beverage commonly consumed in Iran. A validated method was developed for the determination of 20 pesticides in tea based on QuEChERS sample preparation and capillary gas chromatography‐quadrupole mass spectrometry in selective ion monitoring mode (GC‐MS/SIM) using triphenyl methane (TPM) solution as an internal standard. We used fortified, extracted, and cleaned‐up tea samples instead of calibration standards for quantitation, which substantially reduced adverse matrix‐related effects and negative recovery affected by graphite carbon black (GCB) on pesticide analysis. The recovery of pesticides at 3 concentration (40, 60, and 240 ng/g) ranged from 79.5% to 111.4% (n = 3). The method had acceptable repeatability with RSDr < 20%. The limits of quantification (LOQ) for all pesticides were ≤20 ng/g. The analytical results of the proposed method were in good agreement with proficiency test results (FAPAS, 19116). The recoveries and repeatabilities were in accordance with the criteria set by SANCO Guideline. The validated method was suitable for the analysis of pesticides in tea. |
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Keywords: | GC/MS GCB pesticides residue spiked calibration curve tea |
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