Harvard Study Sees Increase in Urinary BPA
Author: admin Post Date: March 31 2010A new study by the Harvard School of Public Health (HSPH) researchers found that participants use for a week from polycarbonate bottles is a popular hard water bottles and plastic bottles, a two-thirds in the urine of chemical bisphenol A (BPA).
Exposure to BPA is used in the manufacture of polycarbonate and other plastics, has shown that the reproductive development in animals and is associated with cardiovascular disease and diabetes in humans. The study is the first to show that drinking polycarbonate bottles to increase the level of urinary BPA, and therefore recommends that containers of beverages with the release of BPA chemical in the fluid that people drink in quantities sufficient to increase the levels of BPA in human urine. The study published on the journal Environmental Health Perspectives and is available freely under http://www.ehponline.org/members/2009/0900604/0900604.pdf. Apart from bottles refillable containers and found a favorite among students, campers and others, and also used in polycarbonate baby bottles, the BPA is also in dental composites and sealants and coating of food cans and aluminum. (The bottles can be identified by a number of recycling polycarbonate 7. ) Many studies have shown that endocrine disorders, such as animals, including early appearance of puberty, impaired growth and organization of the mammary gland tissue and affects the reduction of sperm production in offspring. It may be the most dangerous in the early stages. We have found that drinking cold liquids in polycarbonate bottles for one week only the levels of BPA in the urine of more than two-thirds. When the heat bottles, like the bottles, we expect levels to be significantly higher. It is important because children may be particularly vulnerable to endocrine disrupting potential of BPA, said Karin B. Michels, associate professor of epidemiology at HSPH and Harvard Medical School and lead author of the study. The researchers, from the first author Jenny Carwile, a doctoral student in the Department of Epidemiology at HSPH and Michels said the Harvard College students recruited for the study in April 2008. The 77 participants began the study in seven days washing phase in which all drank cold bottles of stainless steel to minimize exposure to BPA. Participants provided urine samples during the washout period. They were then given two bottles from polycarbonate and invited all the cold drinks from the bottles in the next week to drink urine samples were also during this period are available. The results showed that levels in the urine of participants of BPA in 69 percent after increasing polycarbonate drinking bottles. (Authors of the study found that concentrations of BPA in public colleges registered for the population of the United States only.) Previous studies have shown that BPA could be made from polycarbonate bottles into liquid content and this is the first study to see a corresponding increase in the concentration of BPA in urine in humans.