Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China; Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agricultural, Hangzhou 310008, China.
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China; Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agricultural, Hangzhou 310008, China.
Food Chem. 2018 Apr 1;244:254-259. doi: 10.1016/j.foodchem.2017.09.123. Epub 2017 Oct 10.
9,10-Anthraquinone (AQ) was a new contaminant, with unknown sources, occurred globally in tea. European Union (EU) fixed the maximum residue limit (MRL) of 0.02mg/kg. The pollution source of AQ in tea was traced from the view of AQ deposit on tea crop by simulation. The possible contamination pathway and main factors to decrease AQ were explored in tea cultivation- tea manufacture- tea infusion, on the basis of AQ analytical methods by using solvent extraction and gas chromatography-tandem mass spectrometry (GC-MS/MS) quantification. 58.8-84.6% of AQ degraded in tea processing, and drying played a key role to reduce the AQ contamination. Certain concentration of AQ deposited on tea shoots could resulted in AQ beyond the MRL of 0.02mg/kg in tea. AQ leaching into tea brew (about 10%) could lead to the possible health risk. AQ deposit on tea crop during the tea cultivation might cause the AQ contamination in tea.
9,10-蒽醌（AQ）是一种新的污染物，来源不明，在全球范围内的茶叶中都有出现。欧盟（EU）设定了 0.02mg/kg 的最大残留限量（MRL）。从模拟茶叶作物上 AQ 沉积的角度追溯了茶叶中 AQ 的污染来源。在茶叶种植-茶叶加工-茶叶冲泡的基础上，通过溶剂提取和气相色谱-串联质谱（GC-MS/MS）定量分析方法，探讨了 AQ 的可能污染途径和降低 AQ 的主要因素。在茶叶加工过程中，AQ 降解了 58.8-84.6%，干燥在降低 AQ 污染方面起着关键作用。茶叶芽上沉积的一定浓度的 AQ 可能导致茶叶中 AQ 超过 0.02mg/kg 的 MRL。AQ 浸出到茶泡中（约 10%）可能导致潜在的健康风险。在茶叶种植过程中，AQ 沉积在茶叶作物上可能导致茶叶中 AQ 污染。
