tailieunhanh - Hoá Chất Biosphenol A an toàn hay không?

Introduction For the last 50 years, bisphenol A (BPA – CAS Nọ 80-05-7) is a chemical used primarily to make polycarbonate plastic and epoxy resins. Polycarbonate plastic possesses a unique balance of toughness, optical clarity, high heat resistance, and excellent electrical resistance and has many industrial uses including media products (eg., CDs, DVDs), electronic equipments, sport equipments, bicycle helmets, food containers, drink containers, baby bottles, medical devices and many other products. Epoxy resins are commonly used to coat metal cans to protect the safety and integrity of canned foods and beverages and also are used as dental sealants. Exposure. | r Z I Ấ À r 1 1 À Ă 1 1 1 X r Hoá Chât Biosphenol A an toàn hay không Introduction For the last 50 years bisphenol A BPA - CAS Nọ 80-05-7 is a chemical used primarily to make polycarbonate plastic and epoxy resins. Polycarbonate plastic possesses a unique balance of toughness optical clarity high heat resistance and excellent electrical resistance and has many industrial uses including media products eg. CDs DVDs electronic equipments sport equipments bicycle helmets food containers drink containers baby bottles medical devices and many other products. Epoxy resins are commonly used to coat metal cans to protect the safety and integrity of canned foods and beverages and also are used as dental sealants. Exposure to BPA Human exposure to BPA is via the use of plastic containers bottles food and beverage cans and dental sealants. BPA has been found to leach from bottle and can liners and migrates into foods and beverages. Researchers from government agencies academia and industry worldwide have studied the migration potential of BPA from polycarbonate products into foods and beverages. These studies consistently show that the level of BPA migrating into food is extremely low generally less than 5 parts per billion under conditions typical for uses of polycarbonate products. Although BPA may be found in canned beverages and foods it occurs only at extremely low levels generally less than 37 parts per billion . Why BPA is of concern In recent years a low dose hypothesis has been advanced claiming that exposure to extremely low doses of certain substances could cause adverse health effects in humans including disruption of normal hormonal functions. According to this low dose hypothesis reproductive and developmental effects may result from exposure to low doses of BPA since BPA was considered as having estrogenic activity in ovariectomized rats Dodds and Lawson 1936 . In 1970 Bitman and Cecil assayed DDT and 52 structurally related compounds including BPA in immature

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