Abstract
The present study estimated the residue levels of abamectin (B1a) in green tea leaves and tea infusion. Samples were hydrated with water prior to extraction by using the quick, easy, cheap, effective, rugged, safe method and was analyzed with liquid chromatography-tandem mass spectrometry in positive ion mode. The matrix-matched calibration was linear over the concentration range of 0.01–2mg/kg with determination coefficients (R 2) >0.995. Recovery rates at two spiking levels (0.1 and 0.5 mg/kg) ranged between 80.5–99.7% with a relative standard deviation <11%. The compound was stable at 20°C for 174 days with a recovery estimate of 109.9%. Although the maximum residue limit was not established by the Ministry of Food and Drug Safety, Republic of Korea, the limit of quantitation was very low at 0.01 mg/kg. The method was successfully applied to field incurred samples and detected residue of 0.02 mg/kg in green tea samples sprayed twice (7-3 days). Abamectin was not transferred to tea infusion.
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Kim, SW., Abd El-Aty, A.M., Choi, JH. et al. Analysis of abamectin residues in green tea using QuEChERS method and liquid chromatography-tandem mass spectrometry. J Korean Soc Appl Biol Chem 57, 783–787 (2014). https://doi.org/10.1007/s13765-014-4209-7
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DOI: https://doi.org/10.1007/s13765-014-4209-7