2011年2月16日

又是雙酚A…這次是塑膠杯蓋


最近連續幾天都看到台灣各大媒體在報導塑膠杯蓋的新聞,大意是說一般外帶咖啡所使用的杯蓋預熱可能會釋放出Bisphenol-A (BPA/雙酚A/酚甲烷),這個化學物質是一種環境荷爾蒙,可能會干擾內分泌,還有致癌危險,相關新聞如下:

[自由] 衛署:喝熱飲應打開塑膠杯蓋
[聯合] 從塑膠杯蓋小孔喝熱飲 小心雙酚A下肚
[聯合] 塑膠杯蓋/就算沒雙酚A… 也有健康風險
[中時] 小心雙酚A 熱飲拿掉塑膠杯蓋

看到這新聞覺得蠻扯的,人類對於每天生活中在使用的環境風險竟然瞭解得這麼少,生產出各式各樣的化學品,看似便利了生活,其實卻任由這些奇奇怪怪的物質在自然界四處亂跑,最後進入體內,把自己當作實驗室,測試這些物質是否有害,這就是所謂人類特殊的智慧阿。

這也讓我想到大學時代化工系的教育,學了很多化學,唯一沒學的就是這些化學物質最人類的影響,相關的課只有看似窮極無聊的「實驗室安全衛生」,或是「毒理學概論」這種送分通識。大部分的化學工程師都經過這樣的訓練,我印象中沒有一位老師跟我們提過化學品毒性的問題,環境荷爾蒙,這詞也極少在課本中出現。這也不是某人的錯,怪不了政客或是哪家無良廠商,我只希望經過這些經驗,人類能夠更正視化學品與社會的關係,學會更好的風險管理。

前陣子的Living On Earth電台有一則報導講到柏克萊化學系學生覺醒的故事,該校也在近年成立了綠化學中心,有興趣的朋友不仿參考看看。

最後,回到塑膠杯蓋,又是Bisphenol-A在搞鬼,看到這新聞我馬上聯想到我3年前幫環境資訊電子報翻譯的外電新聞,是說塑膠瓶遇熱會釋放BPA,也因為這則研究,讓曾經紅及一時的Nalgene塑膠登山水壺在過去幾年內近乎消失了,不知道是不是在過三年我們就會看到塑膠杯蓋就此絕跡呢。

話說這則新聞被點閱了15000多次,大概是我走入網路世界以來傳閱最廣的文章吧...

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PC塑膠水壺遇熱 會釋出有害物質http://e-info.org.tw/node/30288
摘譯自2008年1月31日ENS美國,辛辛那提市報導;劉仲恩編譯;蔡麗伶審校

人們在運動或登山時常會用各類彩色透明塑膠瓶攜帶飲料,最新的科學研究顯示,如果裝入熱的液體,將會釋放出擾亂荷爾蒙的化學物質。
根據辛辛那提大學的科學家的研究發現,無論水瓶的新舊,這種聚碳酸酯(polycarbonate,PC)的材質遇到滾燙的熱水將會放出擾亂內分泌的化學物質酚甲烷(bisphenol-A),又稱BPA。
這種化學物質常見於各種用途,包括可重複使用的水瓶、食物收藏罐的襯裡、水管接著劑、牙醫用的溝隙充填劑等。在動物實驗中,此物質會對生殖與腦部發育造成影響。
貝屈博士(Scott Belcher)與他的研究團隊發現,當聚碳酸酯水瓶短暫接觸滾燙的熱水,酚甲烷的釋放速率將會增加55倍。先前的研究也顯示,重複摩擦、刷洗與烹煮嬰兒用的聚碳酸酯瓶會釋放酚甲烷。這讓我們瞭解了酚甲烷能夠從各式聚碳酸酯塑膠中被釋放。
貝屈博士說:「這研究的靈感來自於攀岩團體的疑問,於是我們根據消費者的習慣對這些塑膠水瓶做測試,而結果顯示,唯一對釋放濃度造成影響的因素是液體溫度,而使用九年的水瓶與新的水瓶釋放的酚甲烷數量相當。」
「我們發現無論瓶子的新舊,在冷水或是溫水中,酚甲烷的釋放量與速率都相同。但是一旦水瓶接觸了滾燙熱水,酚甲烷的釋放速率馬上增加為15到55倍。」
貝屈博士強調,雖然目前對於酚甲烷濃度多高才有害人體尚無共識,但他建議消費者慎思長期暴露在此物質下對健康的影響。他說:「酚甲烷是人類接觸的一種類似雌激素的化學物質,這類物質包括了黃豆中有益的的天然植物雌激素,而科學家還在嘗試瞭解這些內分泌干擾素在交互作用下如何影響人體健康。」「但越來越多的證據顯示這些物質多半對健康有負面的影響。」
此研究由美國國家環境衛生科學研究院資助,發表於最新一期「毒理學通訊」期刊。

Hot Liquids Release Harmful Chemical from Plastic Bottles
CINNCINNATI, Ohio, January 30, 2008 (ENS)
The clear, colorful plastic bottles often used by athletes and hikers to carry liquids release a chemical known to disrupt hormone function if the liquids they contain are hot, new research has confirmed.
The endocrine disrupting chemical bisphenol-A, or BPA, is released when polycarbonate plastic is exposed to boiling water, according to University of Cincinnati scientists, whether the bottle is new or old.
The chemical, which is widely used in products such as reusable water bottles, food can linings, water pipes and dental sealants, has been shown to affect reproduction and brain development in animal studies.
Scott Belcher, PhD, and his team found when the same new and used polycarbonate drinking bottles were briefly exposed to boiling hot water, BPA was released up to 55 times more rapidly. "Previous studies have shown that if you repeatedly scrub, dish wash and boil polycarbonate baby bottles, they release BPA. That tells us that BPA can migrate from various polycarbonate plastics,"
"Inspired by questions from the climbing community, we went directly to tests based on how consumers use these plastic water bottles and showed that the only big difference in exposure levels revolved around liquid temperature," Belcher said. "Bottles used for up to nine years released the same amount of BPA as new bottles."
The researchers found that the amount of BPA released from new and used polycarbonate drinking bottles was the same, both in quantity and speed of release, into cool or temperate water. But once the bottles were exposed to boiling water the speed of BPA release was 15 to 55 times faster, explains Belcher.
Belcher stresses that it is still unclear what level of BPA is harmful to humans, but he urges consumers to think about how cumulative environmental exposures might harm their health. "BPA is just one of many estrogen-like chemicals people are exposed to, and scientists are still trying to figure out how these endocrine disruptors - including natural phyto-estrogens from soy which are often considered healthy - collectively impact human health," he says. "But a growing body of scientific evidence suggests it might be at the cost of your health."
The study was funded by a National Institute of Environmental Health Sciences grant. It is published in today's issue of the journal "Toxicology Letters."

4 則留言:

  1. 前一陣子發現商場裡的Nalgene全都換成BPA-free的材質了!!輿論的力量還是很大的。希望廠商能更有自覺啊。

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  2. 冏!!!我現在在Albuquerque,New Mexico。天天去當地一家連鎖咖啡店Satellite喝咖啡!雖然它很久以前就標榜所有杯蓋都是Eco friendly的可分解材質,但是杯蓋不確定是不是BPA的!!窘!!!!!

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  3. Re: Ross@Florida <2420667344364060051>
    對呀,一開始對於化學材料的監管更是重要...

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  4. Re: Jennifer Tseng <6234075062501571452>
    妳可以問問看他們的老闆囉~~~
    p.s. NM應該是個很神奇的地方吧:)

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