Maya Ellison
Peanut butter is a popular food product with a large global market. It is typically sold in plastic jars, with some brands packaging their product in glass jars. There are concerns about the potential health risks of consuming peanut butter from plastic jars, with some experts claiming that the processing and heating of peanut butter before it is placed in plastic containers can cause plasticisers and other chemical residues to leach into the food, making it toxic.
| Characteristics | Values |
|---|---|
| Plastic in peanut butter | Plasticisers in the plastic jars and lids may leach into the peanut butter |
| Plastic jar safety | Most peanut butter jars are made of Polyethylene terephthalate (PET), which is BPA-free and FDA-approved for food contact |
| Plastic jar concerns | Peanut butter must be heated to flow through machinery for packaging, and the hot oils/fats may help plasticisers leach into the food |
| Plastic jar alternatives | Glass jars, tin cans |
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What You'll Learn
Peanut butter jars are made from Polyethylene Terephthalate (PET)
Peanut butter is commonly sold in plastic jars, specifically those made from Polyethylene Terephthalate (PET). PET is the chemical name for polyester, a type of plastic commonly used for packaging. It is used for beverage containers and the plastic packaging for various food products, including nuts, rice, pasta, beans, and condiments.
PET plastic is derived from crude oil, which is drilled or fracked and then transported to a refinery. At the refinery, fractional distillation separates the crude oil into more usable components, including ethylene glycol—a molecule used to make polyester fibres and antifreeze formulas—and terephthalic acid.
The use of PET jars for peanut butter began with brands like Peter Pan, Jif, and Skippy, which switched from glass jars to plastic ones. This shift was financially and environmentally advantageous for these companies. Peanut butter jars made from PET are extremely durable, lightweight, and easy to label. They also offer high clarity, showcasing the product inside.
Importantly, PET is a safe option for food packaging. It is BPA-free and FDA-approved for food contact. This means consumers don't have to worry about potentially harmful chemicals seeping into their peanut butter. While some plastics, such as polycarbonate plastics, contain bisphenol A (BPA), which can leach into foods, PET is not one of them.
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Plastic jars are heat-sealed for food safety
Plastic jars are often used for peanut butter, with brands like Peter Pan, Jif, and Skippy opting for polyethylene terephthalate (PET) jars. These jars are a popular choice for peanut butter companies due to their environmental and financial benefits. While plastic jars are common, it's important to note that the type of plastic used can impact food safety. Many polycarbonate plastics contain bisphenol A (BPA), a chemical that can seep into food. However, the majority of peanut butter jars are made from PET plastic, which is BPA-free and FDA-approved for food contact.
Heat sealing is a critical process in food packaging, ensuring product integrity and extending shelf life. This technique involves applying heat and pressure to join thermoplastic materials, typically plastic films. The heat-sealing process creates a strong, airtight seal, protecting food from contamination, moisture, and other environmental factors. It also helps maintain the colour, texture, and flavour of the product, enhancing its sensory appeal.
The temperature required for heat sealing depends on the thermo-reactive material used and the thickness of the plastic. Different foods may require variations in temperature, time, and pressure to achieve optimal sealing. Heat sealing machines are designed for high-speed operations, ensuring efficient and consistent sealing that minimises the risk of product damage or contamination.
The process of heat sealing is essential for food safety. It creates a barrier against external elements, safeguarding the product from microorganisms, mould, yeast, and bacteria. Heat sealing is particularly crucial for fresh produce and perishable prepared meals, ensuring their safety, quality, and longevity. Proper processing is vital, as improper sealing can lead to food spoilage and even foodborne illnesses.
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![PB2 Pure Peanut Butter Powder - [2 lb/32 oz Jar] - No Added Sugar, No Added Salt, No Added Preservatives - 100% All Natural Roasted Peanuts - 6g of Plant-Based Protein](https://m.media-amazon.com/images/I/71SWJQIT07L._AC_UL320_.jpg)
Peanut butter must be heated to flow through machinery
Peanut butter is a food paste made from ground, dry-roasted peanuts. It is commonly used as a spread on bread, toast, or crackers and is also used in a variety of recipes, including sandwiches, cookies, and candies. The earliest references to peanut butter can be traced back to the Aztec and Inca civilizations, who ground roasted peanuts into a paste.
Today, peanut butter is typically made through an industrial process that involves dry roasting and grinding peanuts. This process can be done using either the batch or continuous method. In the batch method, peanuts are heated in large quantities in a revolving oven at about 800 °F (430 °C). They are then uniformly held and roasted at 320 °F (160 °C) for 40 to 60 minutes. This method is suitable for peanuts with varying moisture content. In the continuous method, a hot air roaster is used, with peanuts passing through while being rocked to ensure even roasting. After dry roasting, the peanuts are quickly transferred to a blower-cooler cylinder, where they are cooled using suction fans.
During the manufacturing process, peanut butter must be heated to flow through the machinery used for roasting, grinding, and mixing. This heating step is crucial to ensure the product reaches a fluid or semi-fluid state, as described in the earliest patent for peanut butter production, which was obtained by Marcellus Gilmore Edson in 1884. By heating the ground peanuts, they become a spreadable paste with a consistency similar to butter or ointment.
Once the desired consistency is achieved, the peanut butter is sent to the packaging department, where it is packaged and labeled. Most peanut butter is sold in jars made of polyethylene terephthalate (PET), a type of plastic that is BPA-free and FDA-approved for food contact. This shift from glass to plastic jars began in 1988 with brands like Peter Pan, Jif, and Skippy, offering cost-effective and environmentally friendly packaging.
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Plastic jars are cheaper and safer to use
Plastic jars are a much cheaper investment to order in bulk and can significantly save on expenses. The manufacturing of plastic bottles utilises innovative techniques to reduce production costs. Plastic is also extremely light and durable, making it perfect for efficient shipping and transportation. Glass jars, on the other hand, can be a hassle to deal with due to the risk of breakage during transportation.
The production of glass also has a larger environmental impact. For example, the manufacture of a glass jar produces five times more greenhouse gas emissions than the manufacture of a plastic container of the same size. Glass also needs twice the amount of fossil fuels that plastic needs in manufacturing.
Plastic jars are also safer to use in certain cases. For example, peanut butter is often sold in jars made of polyethylene terephthalate (PET), which is BPA-free and FDA-approved for food contact. Many polycarbonate plastics contain bisphenol A (BPA), an industrial chemical that can seep into foods, but this is not the case for PET jars.
However, it is worth noting that plastic is harmful to the environment. There are currently five patches of plastic debris floating in the world's oceans, with the largest being twice the size of Texas. Plastic also has the ability to absorb toxins and pollutants that have spilled into the oceans.
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Peanut butter in plastic jars is potentially toxic
Peanut Butter in Plastic Jars: Potentially Toxic?
Peanut butter is a popular food item, commonly used as a spread on bread, with jelly, honey, or Nutella. It is made from ground, roasted peanuts and is available in various textures, including crunchy, creamy, and natural or organic. While peanut butter is a tasty treat, there are concerns about its packaging, specifically when it comes to plastic jars.
The majority of peanut butter brands package their product in plastic jars, made of polyethylene terephthalate (PET), a type of plastic commonly used for water bottles. This shift from glass to plastic jars began in the late 1980s with brands like Peter Pan, Jif, and Skippy, and was driven by financial and environmental considerations. However, there are growing concerns about the potential toxicity of peanut butter stored in plastic jars.
US expert Tamara Rubin has warned consumers about the dangers of purchasing peanut butter in plastic jars, claiming that it is like "eating plastic" and is among the most toxic foods available. The concern stems from the processing of peanut butter before it is placed in plastic jars. Peanut butter must be heated to flow through the machinery for efficient and consistent pouring into jars. This heating process causes the oils and fats in the peanut butter to reach high temperatures.
When the hot peanut butter is then poured into plastic jars, there is a risk of the plasticizers in the plastic jars and lids leaching into the food. Plasticizers are chemical additives that can bond with the oil in the peanut butter, potentially contaminating it. Additionally, the pesticide and fungicide residues, sugar, and other additives commonly found in peanut butter can further increase the toxicity of the product.
To avoid the potential risks associated with plastic jars, some consumers, including Rubin, opt for peanut butter packaged in glass jars. Glass packaging ensures that the product remains safe from chemical leaching and contamination. It is important for consumers to be aware of the potential risks associated with plastic packaging and to make informed choices when purchasing peanut butter.
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Frequently asked questions
Peanut butter itself does not contain plastic, but some experts have warned against buying peanut butter packaged in plastic jars as they claim that the plasticizers in the plastic jars and lids can leach into the food when heated and sealed, making it toxic.
Peanut butter is sold in plastic jars because it is more economical for transportation and cheaper than glass jars. Peanut butter is filled at room temperature or slightly above, so it can use Polyethylene terephthalate (PET) plastic, which is safer and more economical for filling lines.
Polyethylene terephthalate (PET) plastic is the same material used for water bottles. It is BPA-free and FDA-approved for food contact.
Peanut butter can also be purchased in glass jars or tin cans.
To avoid plastic contamination, you can buy peanut butter in glass jars or grind your own peanuts and store them in a glass jar.
