贵定鸟王茶和福鼎茶中咖啡因和儿茶素含量比较

利用高效液相色谱法测定贵定县本地茶种鸟王茶与引进的福鼎茶茶叶中的咖啡因和儿茶素含量,分析比较两种茶叶中咖啡因和儿茶素含量的差异,可为鸟王茶的保护与开发提供科学依据。采用C18色谱柱,流动相为NH4AC水溶液和甲醇,梯度洗脱,检测波长220 nm,流速为0.5 mL/min,柱温室温。结果表明,贵定鸟王茶与福鼎茶中的咖啡因含量无明显差异,鸟王茶儿茶素的单体化合物的含量明显高于福鼎茶。

贵定鸟王种和福鼎种茶叶中茶氨酸含量的比较研究

为了探明贵定本地茶种鸟王茶与引进的福鼎茶的化学成分差异,利用高效液相色谱法测定和比较两种茶叶中茶氨酸的含量差异。采用C18色谱柱,流动相为甲醇和三氟乙酸溶液(体积分数为0.05%),流速为0.8 mL/min,紫外检测波长为208 nm,柱温室温,外标法定量。结果显示,在不同茶叶类型不同采摘时期,鸟王种的茶氨酸的含量均明显高于福鼎种,两种茶叶的茶氨酸含量有显著性差异。

Mineral Elements in Different Varieties of Camellia sinensis

To understand the mineral elements in different varieties of tea （ Camellia sinensis）, 17 mineral elements in eight tea varieties including Yunnan Dayezhong, No. 43 Longjing and No. 6 Zaobaijian, were measured. The results showed that nine elements, such as P, K, Ba, Mn, Cu, were significantly different among varieties, others did not. Black tea varieties usually contain high contents of Cu and K. As a conclusion, mineral elements should be extensively considered in breeding tea varieties.