Chen Hongping, Pan Meiling, Liu Xin, Lu Chengyin
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.
Tea Quality and Supervision Testing Center, Ministry of Agriculture, Hangzhou 310008, China.
Food Chem. 2017 Feb 1;216:1-9. doi: 10.1016/j.foodchem.2016.07.175. Epub 2016 Jul 29.
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.
农药残留可能从茶叶转移至其冲泡液及副产物中，进而被人类摄入。额外的提取条件可能会促使更多农药渗入茶叶的冲泡液及副产物中，对人类造成更大危害。本研究旨在通过加压液体萃取评估多种农药从绿茶中向热水中的浸出情况。结果表明，加标样品中的农药浸出率（0.8 - 45.0%）通常高于阳性样品中的浸出率。当水溶性从20mgL⁻¹增至450mgL⁻¹且LogKow从6降至4时，转移率显著上升。与传统泡茶方式相比，采用加压液体萃取时，所有农药向热水中的浸出量均更多。本研究有助于对茶叶及其副产物中的农药残留进行风险评估，并有助于制定最大残留限量（MRLs）。
