Chloe Zhang
Bisphenol A (BPA) is a chemical used to make polycarbonate, a hard, clear plastic. It was first synthesized in 1891, but its use in plastic products began in the 1940s and 1950s, when the thriving plastic industry underwent a technology revolution. BPA was used to mass-produce various plastic products and coatings, including food containers and packaging. By the late 1970s, the production of BPA in the United States had reached half a billion pounds. However, concerns about the safety of BPA emerged in the early 2000s, with studies suggesting it is a ubiquitous pollutant and a potent developmental toxin. Some countries and states have since legally limited or banned the use of BPA in certain products, particularly those intended for children.
| Characteristics | Values |
|---|---|
| Year BPA was first synthesized by chemists | 1891 |
| Year BPA was first mentioned in a scientific paper | 1905 |
| Year BPA was first used in plastic products | 1950s |
| Year BPA was declared safe by the European Food Safety Authority and US Food and Drug Administration | 2005 |
| Year major manufacturers and retailers abandoned BPA in plastics | 2008 |
| Year six major baby bottle manufacturers announced the removal of BPA from their products | 2009 |
| Year China proposed a BPA ban | 2011 |
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What You'll Learn
BPA was first synthesised by chemists in 1891
Bisphenol A (BPA) is a synthetic estrogen that can interfere with the body's hormones. It is a plastics chemical that was first synthesised by chemists in 1891. However, it was not until 1905 that BPA was first mentioned in a scientific paper by Thomas Zincke of the University of Marburg, Germany.
In the 1940s and 1950s, the plastic industry began using BPA to mass-produce plastic products and coatings. This was due to the discovery of polycarbonate, a hard plastic formed when BPA is polymerised (linked together in long chains). This new plastic was strong enough to replace steel and clear enough to replace glass, making it ideal for use in electronics, safety equipment, automobiles, and food containers. The production of BPA in the United States reached half a billion pounds by the late 1970s.
Despite its widespread use, concerns about the safety of BPA began to emerge. Studies conducted over the past 20 years have shown that BPA is a ubiquitous pollutant in the human body, contaminating nearly 93% of the population. It is also a potent developmental toxin, even at very low doses. In 2008, the National Toxicology Program of the NIH determined that BPA may pose risks to human development, with potential links to early puberty, prostate issues, breast cancer, and behavioural impacts from early-life exposures.
As a result of these concerns, some companies and retailers began to phase out the use of BPA in their products. In 2008, major manufacturers such as Playtex and Nalgene announced a shift to BPA-free products, and retailers like Wal-Mart and Toys R Us followed suit by phasing out BPA-containing baby bottles. In 2009, six major baby bottle manufacturers, including Avent, Disney First Years, and Gerber, removed BPA from their products.
While the safety of BPA continues to be debated, the transition to BPA-free alternatives demonstrates a growing awareness of the potential risks associated with this chemical.
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BPA's use in plastic bottles
Bisphenol A (BPA) is a plastics chemical that was first synthesised by chemists in 1891, although its discovery was only published in 1905. In the 1940s and 1950s, the plastic industry began using BPA to mass-produce plastic products and coatings. BPA is used to make polycarbonate, a hard, clear plastic that can replace steel and glass. It is strong, tough, and found new uses in electronics, safety equipment, automobiles, and food containers.
In the late 1970s, with the booming market for plastics, the production of BPA in the United States reached half a billion pounds. By the 1980s, BPA was being used in plastic water bottles and to make epoxy linings for metal food cans. BPA has been used in food packaging since the 1960s, and the FDA has approved its use in food containers and packaging.
However, concerns have been raised about the safety of BPA. Studies conducted over the past 20 years have shown that BPA is a ubiquitous pollutant in the human body, contaminating nearly 93% of the population. It is also a potent developmental toxin at very low doses, with harmful effects on pregnant women, infants, and young children. In 2008, the National Toxicology Program of the NIH determined that BPA may pose risks to human development, and countries like Canada started restricting its use.
In response to these concerns, some companies have started removing BPA from their products, and retailers have pulled products containing BPA from their shelves. As of 2024, BPA is still commonly used in plastic products, including single-use food containers, DVDs, receipts, medical supplies, auto parts, and clothing made of synthetic plastic fibres. While the FDA continues to review the safety of BPA, the available information supports its ongoing use in approved food containers and packaging.
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BPA's use in metal food cans
BPA, or Bisphenol A, is a chemical often used in plastics to make them strong and clear. It is also used in epoxy resins that can line water pipes and food cans and is used in receipt paper. It was first synthesized by chemists in 1891, but its use became relevant in the 1950s when the plastic industry underwent a revolution with new materials, designs, and processes. In 1957, chemists at Bayer and General Electric discovered that when polymerized, BPA forms a hard plastic called polycarbonate, strong enough to replace steel and clear enough to replace glass.
BPA has been used in metal food cans since the 1960s as a thin epoxy lining to protect the inside of the can from corrosion. It is necessary to prevent or slow down the interaction of food with the metal can. However, over the years, studies have shown that BPA has harmful health effects and can migrate from the can lining into the food. This has led to increased consumer concern and pressure on manufacturers to remove BPA from can linings.
In response to consumer concerns, many food companies have pledged to stop using BPA-based epoxy coatings in their metal food cans. Some companies have already transitioned to BPA-free cans, while others are in the process of phasing out BPA. According to the Can Manufacturers Institute, about 95% of food cans today are made without BPA-based linings, using alternative coatings or polymers.
However, it is important to note that the safety of these alternative linings is unclear. While some manufacturers label their cans as "BPA-free," they often do not disclose the replacement chemicals used. The new linings are made from various materials, including acrylic, polyester, non-BPA epoxies, polyvinyl chloride (PVC) copolymers, or olefin polymers, depending on the manufacturer. The safety of these alternatives has not been thoroughly assessed, and there are concerns about their potential impact on human health and the environment.
Therefore, while the use of BPA in metal food cans is declining, it is important for consumers to remain informed and cautious about the alternatives being used. Consumers can contact companies to inquire about the linings used in their canned food products and advocate for transparency and thorough safety assessments.
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BPA's endocrine-disrupting properties
BPA, or Bisphenol A, is a synthetic plasticizer and one of the highest-volume chemicals produced worldwide. It is commonly used in the production of polycarbonate plastics and epoxy resins, which are used in food and beverage containers, as well as in items like electronics, safety equipment, and automobiles. Due to its widespread use, human exposure to BPA is common, with studies detecting it in the majority of individuals examined.
BPA has been classified as an Endocrine Disrupting Chemical (EDC) or endocrine disruptor due to its ability to interfere with the hormone system. Specifically, BPA has weak binding affinity for the estrogen receptors ERα and ERβ, and it can also activate other receptors such as the membrane receptor GPER (GPR30) and estrogen-related receptors (ERRs). This interference with estrogen receptors can lead to various adverse health effects, including reproductive and developmental issues, metabolic disorders, immune toxicity, neurotoxicity, and interference with cellular pathways. Studies in rodents have identified these adverse effects at levels at or below the current acceptable daily intake level for BPA. Additionally, BPA has been linked to an increased risk of hormone-related cancers, including ovarian, breast, prostate, and colon cancer, and it may induce resistance to certain chemotherapeutic treatments.
The endocrine-disrupting properties of BPA have raised concerns among consumers, scientists, and regulatory bodies. In 2008, Health Canada classified BPA as "toxic" due to its reproductive and developmental toxicity, and banned its use in polycarbonate baby bottles. The European Food Safety Authority (EFSA) and the US Food and Drug Administration (FDA), however, declared BPA safe at estimated levels of human exposure. In response to consumer fears and scientific reports, six U.S. companies that produce baby bottles decided to stop using BPA in their products in 2009.
The safety of BPA has been a topic of ongoing debate, with retailers and producers responding to mounting consumer concerns. While some retailers have proactively removed BPA products from their shelves, others have defended the chemical's safety. The scientific community continues to study the effects of BPA exposure and the validity of current safety standards.
While the exact year when companies started adding BPA to plastic containers may not be pinpointed, the history of BPA's synthesis and incorporation into plastics provides context. BPA was first synthesized by chemists in 1891, but its relevance emerged in the 1950s with the revolution in the plastic industry. In 1953, Dr. Hermann Schnell of Bayer and chemist Dr. Daniel Fox of GE independently discovered polycarbonate (PC) resin, a tough and resilient material. This discovery led to the realization that BPA, when polymerized, forms polycarbonate plastic, which has various industrial applications. By the late 1970s, the production of BPA in the United States had reached half a billion pounds.
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Regulatory responses to BPA
Bisphenol A (BPA) is a chemical produced in large quantities for use primarily in the production of polycarbonate plastics and epoxy resins. It is found in various products, including shatterproof windows, eyewear, water bottles, and epoxy resins that coat some metal food cans, bottle tops, and water supply pipes. The primary source of exposure to BPA for most people is through their diet, with BPA in food and beverages accounting for the majority of daily human exposure.
In 2008, the European Food Safety Authority and the US Food and Drug Administration (FDA) declared BPA safe at estimated levels of human exposure. However, the same year, Health Canada released results of its human health screening assessment, declaring BPA "toxic" due to reproductive and developmental toxicity and environmental effects. Canada subsequently banned the import, sale, and advertising of polycarbonate baby bottles containing BPA.
In 2009, six of the major baby bottle manufacturers in the US announced the removal of BPA from their products. This was followed by a bill introduced in Congress banning BPA in children's food containers. The same year, the Australia and New Zealand Food Safety Authority (Food Standards Australia New Zealand) found no health risk with bisphenol A baby bottles if the manufacturer's instructions were followed, as levels of exposure were very low. However, they acknowledged the voluntary action by overseas manufacturers to discontinue BPA in baby bottles.
In 2010, the EPA published a revised action plan for BPA as a "chemical of concern". However, in 2013, the EPA withdrew its 2010 draft BPA rule, stating that it was "no longer necessary" as they were taking a different approach to evaluating chemicals. As of 2014, research and debates continued regarding the potential ban of BPA.
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Frequently asked questions
BPA was first synthesized by chemists in 1891, but its use in plastic containers began in the 1940s and 1950s.
In 2008, major manufacturers and retailers began abandoning BPA in plastics. By 2009, six major baby bottle manufacturers had removed BPA from their products.
Canada, the United States, China, and Japan have all taken steps to regulate or ban BPA in food and beverage containers, especially those intended for children.
BPA is a synthetic estrogen that can interfere with natural hormones in the human body, leading to potential health risks such as early puberty, prostate issues, breast cancer, and behavioral changes.
