Abstract
The water-extractable fluoride content of nine packed teas, ten instant tea powders, and ten tea beverages manufactured in China, Japan, Taiwan, and the USA was determined by the fluoride ion specific electrode method. Among the black, green, and Oolong packed teas, the F content ranged from 41.5 to 212.4 mg F/kg tea. Among the instant tea powders, the range was broader: 25.9 to 631.3 mg F/kg tea, the latter in a black tea from Taiwan. The bottled and canned tea beverages had fluoride concentrations ranging from 0.20 to 1.80 mg F/L, with the highest in Oolong tea beverages. Chronic toxic levels of fluoride consumption from some of these tea products are possible. The packaging paper of packed teas and the addition of milk had no effect the fluoride concentrations in the infusions.
-
-
Amelioration by black tea of sodium fluoride-induced changes in protein content of cerebral hemisphere, cerebellum and medulla oblongata in brain region of mice.
Oral administration of sodium fluoride (NaF, 6 and 12 mg/kg body weight/day) to Swiss strain male albino mice for 30 days caused significant dose-dependant reduction in the content of acidic, basic, neutral, and total protein in cerebral hemisphere, cerebellum and medulla oblongata region of brain. After 30 days of NaF
-
Estimated dietary fluoride intake for New Zealanders.
OBJECTIVES: Existing fluoride concentration and consumption data were used to estimate fluoride intakes from the diet and toothpaste use, for New Zealand subpopulations, to identify any population groups at risk of high-fluoride intake. METHODS: For each sub-population, two separate dietary intake estimates were made--one based on a non-fluoridated water supply (fluoride
-
Analysis of naturally occurring fluoride in commercial teas and estimation of its daily intake through tea consumption
The aim of this study was to determine the levels of fluoride in commercial teas and to estimate the contribution of tea consumption to the fluoride recommended daily allowance. A total of 558 tea products in 6 categories, green tea, black tea, oolong tea, pu'er tea, white tea, and reprocessed
-
Fluoride Content in Asian Produced Green Teas.
Background: This study determined the fluoride content of green tea from various parts of Asia, where green tea originates. Methods We brewed 2.5 g each of 4 types of green tea (from China, South Korea, Japan and Sri Lanka) using deionized water heated to boiling. Water was cooled to 71°C, then tea was
-
Comparative study of vegetative and reproductive growth of different tea varieties response to different fluoride concentrations stress.
Highlights A low-level and a high-level fluoride varieties were selected for the morphological and transcriptome analysis to explore their different regulate network for the fluoride stress. High-fluoride tea tree varieties had stronger ROS-scavenging ability than low-fluoride varieties. High-fluoride tea tree varieties could maintain the normal growth and reproduction under high-fluoride
Related Studies :
-
-
-
The Lancet: Fluoride Studies in a Patient with Arthritis
It is possible that fluoride intake from tea may be sufficient to cause fluorosis, and I report here a case which gives some evidence for this.
-
Fluoride content in tea and its relationship with tea quality.
J Agric Food Chem. 2004 Jul 14;52(14):4472-6. Fluoride content in tea and its relationship with tea quality. Lu Y, Guo WF, Yang XQ. Department of Tea Science, Zhejiang University, 268 Kaixuan Road, Hangzhou 310027, People's Republic of China. Abstract: The tea plant is known as a fluorine accumulator. Fluoride (F) content in fresh leaves collected
-
Skeletal Fluorosis in the U.S.
Although there has been a notable absence of systematic studies on skeletal fluorosis in the U.S., the available evidence indicates that the consumption of artificially fluoridated water is likely to cause skeletal fluorosis and other forms of bone disease in people with kidney disease and other vulnerable populations.
-
Exposure Pathways Linked to Skeletal Fluorosis
Excessive fluoride exposure from any source -- and from all sources combined -- can cause skeletal fluorosis. Some exposure pathways , however, have been specifically identified as placing individuals at risk of skeletal fluorosis. These exposure pathways include: Fluoridated Water for Kidney Patients Excessive Tea Consumption High-Fluoride Well Water Industrial Fluoride Exposure Fluorinated Pharmaceuticals (Voriconazole
-
Tea Intake Is a Risk Factor for Skeletal Fluorosis
A number of recent studies have found that heavy tea drinkers can develop skeletal fluorosis - a bone disease caused by excessive intake of fluoride.
Related FAN Content :
-