茶叶科学2011，Vol.31Issue(4)：349-354,6.
茶叶中稀土氧化物总量现状及其溶出特性研究
Status of the Total Amount of Rare Earth Oxides in Tea and Its Leaching Characteristics
摘要
Abstract
In order to figure out the status of total amount of REE oxides (∑REOs) in tea and its leaching characteristics, the statues of ∑REOs in 1245 tea samples from 2007 to 2010 were statistical analyzed, and the leaching characteristics on the different ∑REOs with different processing technology were studied. The results showed that the Median of the ∑REOs in Chinese tea was about 2 mg/kg, and the ranges were from ND to 13.80 mg/kg, about over 90% of tea were under 5 mg/kg. The ∑REOs in over half of Oolong teas were more than 2 mg/kg, but for the other tea such as green tea, scented tea, less than 30% of those teas were more than 2 mg/kg. When the tea was grinded, the leaching rate of the ∑REOs was increased significantly than the original tea. And the processing technology maybe was the major factor to impact on the leaching rate of the ∑REOs. There were some rules about the leaching rate followed by low to high: needle-shaped tea< flat-shaped tea (such as Longjin tea)<Curl-shaped tea < powdered tea. The ∑REOs was highest in the first brew, and then was decreased along with the 2nd and the 3rd brews. The Powdered Oolong tea has the highest leaching rate about the ∑REOs, the leaching rate was about 60%, but even the ∑REOs in the powdered Oolong tea has reached to 6 mg/kg, the ∑REOs in the brew still under the limited value about the standard in drinking water. The needle-shaped tea has the lowest leaching rate about the ∑REOs, the leaching was as low as about 5%.关键词
茶叶/∑REOs/浸出率Key words
tea/ ∑REOs/ leaching rate分类
农业科技引用本文复制引用
石元值,韩文炎,马立锋,方丽..茶叶中稀土氧化物总量现状及其溶出特性研究[J].茶叶科学,2011,31(4):349-354,6.基金项目
国家自然科学基金(40771113) （40771113）
