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《Journal of Tea Science》 2003-02
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Acute Toxicity Evaluation of Pu'er Tea

LIU Qin-jin1, CHEN Wen-pin1,2, BAI Wen-xiang3, LI Qing-ze4 (1. Tea Research Institute, South-West Agricultural University, Chongqing 400716, China; 2. Tea Research Institute of Yunnan Province, Menghai 666201, China; 3. Yiliang Tea Plant of Tea Export Corporation of Yunnan Province, Yiliang 652100, China; 4. Developing Center for Superior Quality Agricultural Products of Agricultural Ministry, Beijing 100026, China)  
The acute toxicity of three kinds of typical Puer tea and one kind of baked green tea from Yunnan province were evaluated in this investigation. The tested mice were feed with tea infusion. The LD50 of the three kinds of Puer Tea was 9.7 g/kg, 11.2 g/kg and 12.2 g/kg respectively, while that of the baked green tea was 7.5 g/kg. None of tested mice died 14 days later, when single feeding dose of four kinds of tea was less than 5 g/kg. Most tested mice showed excitement when the feeding dose less than 1/2 of LD50. The tested mice revealed symptoms of restrained nervous 10 minutes late with the feed dose increased. There was only one peak of the acute lethal time in the case of Pu'er tea, and two peaks appeared in the case of baked green tea. The authors regarded that the death of tested mice was attributed to the high concentration of caffeine and polyphenols. It is concluded that all four kinds of tea are highly safe for drinking according to LD50. However , scientific drinking methods should be mentioned first.
【Fund】: 本研究为农业部普洱茶行业标准制订资助项目
【CateGory Index】: TS272
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