Contents of fluoride and tea polyphenols in brick tea at fluorosis regions in Inner Mongolia
10.3760/cma.j.issn.2095-4255.2014.03.024
- VernacularTitle:内蒙古饮茶型氟中毒病区居民砖茶中氟和茶多酚含量调查
- Author:
Lina LIANG
;
Jinhui ZHANG
;
Guangqian YU
- Publication Type:Journal Article
- Keywords:
Brick tea;
Fluorosis;
Tea polyphenols
- From:
Chinese Journal of Endemiology
2014;33(3):331-334
- CountryChina
- Language:Chinese
-
Abstract:
Objective To determine the contents of fluoride and tea polyphenols in brick-tea and to understand the utilization ratio of qualified brick-tea in fluorosis regions in Inner Mongolia.Methods The investigation was carried out in Chenbaerhuqi Country and Eweukeqi Country.Seventy-two households of four villages in Chenbaerhuqi and 11 households of three villages in Ewenkeqi were selected as study subjects.The brick-tea in each household was sampled.The contents of fluoride and tea polyphenols were determined by using fluoride selective electrode method and Forint-Ciocalteu oxidation method,respectively.T test and linear correlation were used to analyze the data.Results The fluoride content in qualified brick tea ranged from 114.82 mg/kg to 290.23 mg/kg with an average value of 171.78 mg/kg,while tea polyphenols content was between 56.15 g/kg and 132.18 g/kg with an average value of 95.44 g/kg.In unqualified brick-tea,the average fluoride content was 459.86 mg/kg with the range from 304.71 mg/kg to 660.76 mg/kg and the average of tea polyphenols was 67.48 g/kg with the range from 36.03 g/kg to 102.15 g/kg.The content of tea polyphenols of qualified brick tea was significantly higher than that of unqualified brick tea (P ＜ 0.05).The content of tea polyphenols was negatively correlated with fluoride content(r =-0.636,P ＜ 0.05).The content of tea polyphenols was 396 times more than that of fluoride in brick tea.The utilization ratio of qualified brick-tea in the investigation areas was 53.0％(44/83).Conclusion The fluoride content in qualified brick-tea was less than unqualified brick-tea,and the tea polyphenols of qualified brick-tea was higher than the unqualified brick-tea.The utilization rate of qualified brick tea is not high and further actions are needed to be taken to supply more qualified brick-tea for controlling of drinking brick-tea type fluorosis.
