关键词: 朱雀寺红茶, 生化成分, 微量元素硒, 重金属, 农药残留

Abstract: The quality characteristics of the spring and autumn rosefinch black tea samples in 2018, were judged by compared with the main content of biochemical components and sensory quality evaluation. The results of sensory evaluation showed that spring rosefinch black tea was brown and bright, uniform and tight, sweet and lasting, and the soup color of red and bright. Autumn rosefinch black tea was slightly loose in shape, but still had the characteristics of sweet and mellow, and the soup color was bright and so on. The comprehensive scores showed that spring black tea belonged to the first grade second class tea, and autumn black tea belonged to the third grade first class high quality tea. The results of physical and chemical examination showed that the total ash and water extract content of spring and autumn black tea samples were in accordance with the national standard. The contents of tea polyphenols, caffeine, free amino acids and tea pigment were little different from those of black tea from other producing areas in China. The average content of trace element selenium is in the range of 0.038 1~0.263 0 mg/kg. The contents of heavy metals Pb,As,Hg and Cd were lower than the China national export quality standards of tea. Moreover, the 48 pesticide residues were not detected in spring and autumn tea samples. Therefore, it can be seen that the spring and autumn rosefinch black tea samples are according with the relevant national standards, and the whole level of the black tea reaches the pure natural organic high-quality black tea, whether it is in the sensory aspect or on the main contents and pesticide residues.

Key words: rosefinch black tea, biochemical components, trace element selenium, heavy metal, pesticide residue