Cans are coated withresins,the components of a liquid that can set into a hard enamel-like finish (Wikipedia,2012). Natural resins,called oleoresins,are derived from various plants. Synthetic resins solidify in a manner similar to plant resins but are liquid monomers of plastics that cure irreversibly (Wikipedia,2012). Recent attention has focused on one synthetic resin 鈥?epoxy resin 鈥?that is commonly used to coat the interior of food and beverage cans,because its foundational building block is bisphenol A (BPA). Widespread human exposure to BPA as well as BPA鈥檚 potential health effects have been the subject of intense scientific and public scrutiny and debate. Urinary BPA measurements from the National Health and Nutrition Examination Survey have revealed widespread human exposure to BPA (Calafat et al.,2008). BPA has been measured in canned food products (Cao et al.,2010); Carwile et al. (2011) reported a marked increase in urinary BPA levels in students who consumed canned soup for five consecutive days. LaKind and Naiman (2011) found a statistically significant association between urinary BPA levels and soda consumption in the US population. There have been calls for phasing out epoxy resins and requiring the use of alternative can-coating resins.
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The Coatings Group is a global leader in Coatings Exhibitions, Publications and Conferences.
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