T: TOXICOLOGY AND CHEMICAL FOOD SAFETY
An Applicable Strategy for Improvement Recovery in Simultaneous Analysis of 20 Pesticides Residue in Tea
Article first published online: 27 MAR 2013
© 2013 Institute of Food Technologists®
Journal of Food Science
Volume 78, Issue 5, pages T792–T796, May 2013
How to Cite
Shoeibi, S., Amirahmadi, M., Rastegar, H., Khosrokhavar, R. and Khaneghah, A. M. (2013), An Applicable Strategy for Improvement Recovery in Simultaneous Analysis of 20 Pesticides Residue in Tea. Journal of Food Science, 78: T792–T796. doi: 10.1111/1750-3841.12100
- Issue published online: 6 MAY 2013
- Article first published online: 27 MAR 2013
- Manuscript Accepted: 3 FEB 2013
- Manuscript Received: 31 JUL 2012
- pesticides residue;
- spiked calibration curve;
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.
The presented analytical method could be used for determining pesticide residues in black tea and extended to other matrices containing high levels of pigments. Fortified, extracted, and cleaned-up tea samples were used to compensate for matrix effects.