Talk:Bisphenol A

Levels of intake over EPA limit?

I'm not sure this article is correctly citing reference number 52. The article says "several studies of children, who tend to have the highest levels, have found levels over the EPA's suggested safe limit figure," citing http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3079892/#!po=40.6250. After spending some time in research I cannot find any studies that support this. The study cited does not have any results over 50ug/kg/day. It says that "Median values were below 52 ng/kg-day for all groups analyzed and the 95th percentiles were below 500 ng/kg-day (Table 2). Thus, median and 95th percentile intake estimates were approximately two to three orders of magnitude below the current health-based guidance value" (page 10) The highest BPA level shown in this study was 481 ng/kg/day, well below the 50 ug/kg/day limit. The mistake may have come from confusion between the units ng and ug. 75.129.113.63 (talk) 03:56, 10 October 2014 (UTC)

BPA alternative disrupts normal brain-cell growth, is tied to hyperactivity, study says

• BPA alternative disrupts normal brain-cell growth, is tied to hyperactivity, study says — Preceding unsigned comment added by 80.243.6.98 (talk) 12:03, 13 January 2015 (UTC)

Ref idea

http://www.huffingtonpost.com/2015/01/13/bpa-free-bps_n_6465214.html?utm_hp_ref=green

Bananasoldier (talk) 06:30, 18 January 2015 (UTC)

Not really a preferred source since it's a news article rather than a scientific journal article. Besides, this well-publicized study was a primary animal study on the effect of Bisphenol S (a compound related to BPA) on Zebrafish. We should really wait to see if reliable secondary sources discuss this information and human studies will be far more valuable as citations. TylerDurden8823 (talk) 06:53, 18 January 2015 (UTC)

I would suggest a slight correction: there are two polymer families based on bisphenol-A: polycarbonates as cited and also resole epoxy resins that are glycidyl ether derivatives of BPA (commonly used as the basis for the brown colored coating on the interior of a common steel food can). There are also secondary polymers based on such epoxy resins made by reacting the residual epoxide groups with polymerizeable end groups. A closely related polymer family to the epoxy resoles are the so-called phenoxy resins in which the terminal epoxides have been converted to nonreactive end groups. I fully agree that bisphenol-A is a reacted component in all of these and not a blended ingredient. Slange8780 (talk) 13:56, 20 February 2015 (UTC) Slange8780

Really poor and misleading

This article repeatedly claims that BPA is "an ingredient" in plastics and is used to make plastics. As a chemist, this is grating. BPA is a reactant used in the syntheses of various plastic polymers. In plastics it is present either as a trace contaminant left over from the reaction or possibly as a degradation product. IMHO, wikipedia should be more careful to distinguish between plastics which are materials formulated (or "made from") from polymers, and various other ingredients (plasticizers, stabilizers, pigments, and other additives) and man-made polymers (synthetic polymers). While the term "plastics" can be used to mean either, the distinction between the two is important when discussing ingredients. The fact is, there are all sorts of toxic nasty chemicals used in polymerization. Would it be useful (or accurate) to describe PVC (polyvinyl chloride polymer) plastic as containing the poison gas chlorine as one of its "ingredients"? This seems to have been written by the "all chemicals are bad" (know-nothing) crowd. Polymers are (usually) the majority ingredient in plastics, true, (and some plastics are almost pure polymer, but those are the exception). Using the latter term as a synonym for the former is just sloppy. The reality is that once a chemical molecule reacts it no longer exists, which is different from a chemical mixture where each compound retains its chemical properties and can be separated back into the pure state (usually). The point is that BPA is not (despite the FDA's sloppy wording) a component of plastic any more than you contain fish, beef, or rice as "components". Its called chemistry.Abitslow (talk) 00:41, 17 February 2015 (UTC)

Hi there, what specific changes would you like to make? Gandydancer (talk) 00:53, 17 February 2015 (UTC)

BPA is employed to make certain plastics and epoxy resins. BPA-based plastic is clear and tough, and is made into a variety of common consumer goods, such as water bottles, sports equipment, CDs, and DVDs Two problems with this. Firstly, BPA is not used in "certain plastics", it is basically used in ONE class of synthetic polymer, which is polycarbonate. Secondly, to list "water bottles" under "common consumer goods" is EXTREMELY misleading. Most readers will assume that "water bottles" means the bottles in which you purchase Evian water at the supermarket (or similar). In fact, polycarbonate is only used to make the 25 litre bottles of water that sit on top of office water dispensers. All drinks bottles including those in which mineral water is sold in shops are made from PET, which has no connection with BPA at all. This sort of thing only adds to the hysteria and pseudoscientific ramblings that we so commonly hear. I would strongly suggest that the sentense is reworded as such: "BPA is used as the base material of the plastic called polycarbonate, and also epoxy resins. Polycarbonate is clear and tough, and can be used as a component of some common consumer goods, such as some sports equipment, CDs, and DVDs. It is also used to fabricate the large 25 litre containers used in water dispensers" — Preceding unsigned comment added by 213.225.149.5 (talk) 10:20, 20 February 2015 (UTC)

BPA considered safe by EFSA since Jan 2015

In Jan 2015 EFSA announced that there are no consumer health risk from bisphenol A exposure http://www.efsa.europa.eu/en/press/news/150121.htm, they even updated thei BPA FAQ. There are links to EFSA website in this article and information that should be updated. — Preceding unsigned comment added by 181.166.88.141 (talk) 02:43, 11 May 2015 (UTC)

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That was a article, not a scholar research. by phoniex--36.225.98.184 (talk) 12:06, 1 February 2016 (UTC)