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普洱茶不能防癌反致癌? 专家:无稽之谈
2017-09-07 11:01:47 中国经济网
云南农业大学研究员李亚莉曾通过模拟发酵实验表明,普洱茶的晒青原料接种产毒黄曲霉,在发酵过程中,虽然发酵初期黄曲霉能在茶样中生长繁殖,但在发酵后期黄曲霉的生长明显受到抑制,其数量逐渐下降,发酵终止时,在普洱茶中的黄曲霉最终不产黄曲霉毒素。
钟凯也提到,虽然黄曲霉是自然界常见霉菌,普洱茶确实可能携带它,但要产生毒素并不容易。普洱茶的渥堆发酵温度较高,不是黄曲霉喜欢的温度,而且普洱茶的营养成分也不适合黄曲霉的口味,因此渥堆中产生毒素的可能性很小。另外,有研究发现,黑曲霉和黄曲霉在一起的时候会产生竞争关系,能够抑制黄曲霉的生长和产毒,甚至能一定程度上降解黄曲霉毒素。
因此,普洱茶致癌的说法实为无稽之谈。消费者在选购时,只要注意不选购过于便宜、纸包上有水渍,茶饼明显发霉(比如起白霜、有霉点)或味道不悦的茶饼,不喝不清亮、甚至出现的霉味的茶,基本不会出现问题。
吴顶明还表示,通过各项研究实践证明茶里面所含的有益成份很多,像茶多酚、儿茶素、茶红素、茶黄素、花青素等物质早就被科学证实具有很强的抑制细胞突变的作用,而正是因为细胞突变才有可能引起癌症。另外这些物质能有效阻断亚硝基化合物的合成。所以可以肯定,喝茶是可以防癌抗癌的。
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