Evaluation of transfer rates of multiple pesticides from green tea into infusion using water as pressurized liquid extraction solvent and ultra-performance liquid chromatography tandem mass spectrometry.
Pesticide residues could be transferred from tea into its infusion and by-products, and subsequently consumed by humans. Extra extraction conditions may induce more pesticide leaching into the infusion and by-products of tea and cause greater damage to humans. The aim of this study is to evaluate the infusion of multiple pesticides from green tea into hot water via pressurized liquid extraction. The results showed that pesticides in spiked samples generally have higher leaching (0.8-45.0%) than those in the positive samples. There was a marked rise of transfer rates when water solubility increased from 20mgL(-1) to 450mgL(-1) and LogKow decreased from 6 to 4. All pesticides had more leaching into hot water using pressurized liquid extraction than traditional tea brewing. This study helps in risk assessment of pesticide residues and in the formulation of maximum residue levels (MRLs) in tea and its by-products.
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China; Tea Quality and Supervision Testing Center, Ministry of Agriculture, Hangzhou 310008, China; CAAS Key Laboratory of Tea Quality and Safety & Risk Assessment, Hangzhou 310008, China.
Hongping
H
Chen
Tea Quality and Supervision Testing Center, Ministry of Agriculture, Hangzhou 310008, China.
Meiling
M
Pan
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China; Tea Quality and Supervision Testing Center, Ministry of Agriculture, Hangzhou 310008, China; CAAS Key Laboratory of Tea Quality and Safety & Risk Assessment, Hangzhou 310008, China. Electronic address: LiuXin@mail.tricaas.com.
Xin
X
Liu
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China; Tea Quality and Supervision Testing Center, Ministry of Agriculture, Hangzhou 310008, China; CAAS Key Laboratory of Tea Quality and Safety & Risk Assessment, Hangzhou 310008, China. Electronic address: Lchy@mail.tricaas.com.
Chengyin
C
Lu
D002853:Chromatography, Liquid; D010573:Pesticide Residues / Q000032:analysis*; D012995:Solubility; D053719:Tandem Mass Spectrometry; D013662:Tea / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D010573:Pesticide Residues; D013662:Tea; D014867:Water
Green tea; Liquid chromatography tandem mass spectrometry; Pesticides; Pressurized liquid extraction; Transfer rate