Li Jin, Sun Kang, Ma Qingping, Chen Jin, Wang Le, Yang Dingjun, Chen Xuan, Li Xinghui
Tea Research Institute, Nanjing Agricultural University, Nanjing, China.
Institute of Soil & Fertilizer and Resources & Environment, Jiangxi Academy of Agricultural Science, Nanchang, China.
Front Microbiol. 2017 Oct 30;8:2089. doi: 10.3389/fmicb.2017.02089. eCollection 2017.
When the homogenate of fresh tea tree leaves was fermented to produce black tea beverage, the (main pathogen or endophyte of ) may be mixed into the fermentation liquor. However, it was unclear whether contaminated tea beverage would damage human health. Therefore, we investigated the changes of functional components and the influences on mice. was added to the green tea infusion. After cultivation of 48 h, tea polyphenols, caffeine, and L-theanine decreased by 31.0, 26.2, and 8.3%, respectively. The contaminated tea infusion showed brown stain, and produced a group of toxic materials named phthalic acid esters. The animal study showed that green tea without contamination significantly decreased levels of alanine aminotransferase, triglycerides, free fatty acids, low-density lipoprotein, and increased insulin level compared with obese mice. On the contrary, contaminated tea lost the effects on these indicators. Furthermore, the urea nitrogen and serum creatinine levels significantly increased in the contaminated tea-drinking mice. Altogether, our results indicate that contamination can reduce the amount of functional components of green tea. Therefore, it inhibits some health-care function of lipid-lowering. In addition, the toxic components in contaminated tea infusion might induce renal damage.
当新鲜茶树叶片的匀浆发酵制成红茶饮料时，（主要病原体或内生菌）可能会混入发酵液中。然而，受污染的茶饮料是否会损害人体健康尚不清楚。因此，我们研究了功能成分的变化及其对小鼠的影响。将（某物质）添加到绿茶浸出液中。培养48小时后，茶多酚、咖啡因和L-茶氨酸分别下降了31.0%、26.2%和8.3%。受污染的茶浸出液出现褐色污渍，并产生了一组名为邻苯二甲酸酯的有毒物质。动物研究表明，与肥胖小鼠相比，未受污染的绿茶显著降低了丙氨酸转氨酶、甘油三酯、游离脂肪酸、低密度脂蛋白水平，并提高了胰岛素水平。相反，受污染的茶失去了对这些指标的影响。此外，饮用受污染茶的小鼠尿素氮和血清肌酐水平显著升高。总之，我们的结果表明，（某物质）污染会减少绿茶的功能成分含量。因此，它抑制了一些降脂保健功能。此外，受污染茶浸出液中的有毒成分可能会导致肾损伤。
