Multi-Residue Pesticide Analysis in Tea: Optimized Cleanup After QuEChERS Extraction for UPLC-MS/MS and GC-MS/MS Analysis
This application note presents QuEChERS extraction and SPE-based cleanup strategies for multi-residue pesticide analysis of dried teas.
The tea sample is first equilibrated with water before extraction using the DisQuE pouch for CEN QuEChERS. Then, three aliquots are taken for further analysis. One aliquot is subjected to a dSPE cleanup specific for determination of base/neutral pesticides by UPLC-MS/MS. A second aliquot is taken and subjected to an SPE cartridge cleanup optimized for determination of base/neutral pesticides by GC-MS analysis. The third aliquot is subjected to an SPE cleanup for LC-MS/MS determination of acidic pesticides not amenable to cleanup on PSA (primary secondary amine silica).
Recovery data are presented for target pesticides extracted from dried black tea using these three cleanup protocols.
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