Cleanup using two types of agents (S-NH and S-Si) developed by the authors was investigated with the aim of removing interfering substances such as catechin and caffeine to enable analysis of pesticide residues in tea. S-NH and S-Si removed approximately 100% of catechin and caffeine in 6 species of tea. Recoveries of 61 pesticides in tea were tested at the level of 0.1 μg/g, and 44 pesticides showed recovery within the range from 70 to 120%, with RSD of less than 10%. With cleanup using S-NH and S-Si, pesticide residues in tea could be analyzed within two hours.
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