April 28, 2009 -- With all of the bad press swirling around certain types of plastic lately, regular old plastic water bottles have maintained a reputation as safe, at least as far as human health is concerned. New evidence, however, suggests that plastic water bottles may not be so benign after all. Scientists in Germany have found that PET plastics -- the kind used to make water bottles, among many other common products -- may also harbor hormone-disrupting chemicals that leach into the water. It's too soon to say whether drinking out of PET plastic bottles is harmful to human health, said lead researcher Martin Wagner, an ecotoxicologist at Goethe University in Frankfurt. But it now appears possible that some as-yet unidentified chemicals in these plastics have the potential to interfere with estrogen and other reproductive hormones, just as the infamous plasticizers BPA and phthalates do. Related Content:
"What we found was really surprising to us," Wagner said. "If you drink water from plastic bottles, you have a high probability of drinking estrogenic compounds." The study adds to growing concerns about products that span the plastic spectrum, added Shanna Swan, an epidemiologist at the University of Rochester School of Medicine and Dentistry in New York. "This is coming at a good time because the use of bottles for consuming water is getting very bad press now because of its carbon footprint," she said. "It's just another nail in the coffin of bottled water, the way I see it." Wagner and a colleague used genetically engineered yeast to analyze 20 samples of mineral water. Nine samples came our of glass bottles. Nine were bottled in PET plastic. And two were in cardboard, juice-like boxes. The specialized yeast -- which change color in the presence of estrogen-like compounds -- revealed estrogenic activity in seven of the nine plastic bottles (and both cardboard samples), compared with just three of the nine glass ones. Overall, Wagner said, levels of these compounds in the water were surprisingly high. German mineral water comes from natural springs. So, to see if the estrogenic compounds were actually coming from the water itself, Wagner emptied the bottles and replaced the water with a pure snail medium and a tiny species of snail that is especially sensitive to estrogenic compounds. Get More NewsMouse Cloned From Long-Frozen CellResearchers create a mouse from a long-frozen cell. Will the mammoth be next?'Bubble' Could Protect AstronautsScientists say a "bubble" around a Mars-bound spaceship could protect astronauts.Big Reduction of Snowmobiles in Yellowstone ProposedA new plan would cut snowmobile use by 40 percent in Yellowstone.Microbes: Fuel of the Future?A reddish South American microbe is literally breathing fuel, say scientists.DNA Links Remains to Steve FossetDNA tests on two bones found in California confirm they are those of Steve Fossett.Women Carry More Bacteria Than MenSome bacteria prefer women, suggests a new study. But why?Ancient 'Water Monster' Facing ExtinctionA foot-long salamander that was a key part of Aztec legend is threatened by extinction.Grand Canyon's Youth ConfirmedThe Grand Canyon is millions of years younger than previously thought, argue geologists.My Take: E-Voting Not User FriendlyOpinion: Electronic voting machines don't always capture the intent of voters.SLIDE SHOW: Landscapes of TerrorWhat makes a place feel scary? There are scientific explanations.At 40, Brain and Body SlowThe part of the brain in charge of motion starts a gradual slide in middle age.Spiders, Scorpions Among World's Oldest CreaturesMany creepy crawlies have been on Earth much longer than previously believed.Blood-Sucking Vampire Bats Sing DuetsWhite-winged vampire bats "harmonize" with separated roost mates. |
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