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The non-stick coating of the rice cooker has peeled off after long use. Is it harmful to use it?
Anyone who uses a rice cooker may encounter a problem with the pot being scratched, along with the concern of whether it is still safe?
The core of a conventional rice cooker is made of metal (mainly aluminum), which has good heat conduction. The surface of the aluminum core is often coated with a non-stick layer to prevent rice from sticking to the pot after cooking, called teflon.
Teflon is an inert substance that does not react with the rice in the pot when cooking. The teflon layer will begin to deteriorate when heated from 230 to 260 degrees Celsius and decompose when it reaches above 350 degrees Celsius.
A study by the University of Newcastle and Flinders University (Australia) showed that just a small scratch on the non-stick layer can release about 9,100 plastic particles during the cooking process. If the non-stick coating is damaged, a few millimeters in size or more, it will release 2.3 million microplastic and nanoplastic particles and can penetrate into food
According to Dr. Vu Thi Tan (Hanoi University of Science and Technology), when the core is scratched, the teflon coating will peel off and mix with the rice. Fortunately, the maximum temperature of a rice cooker is 100 degrees Celsius, above which the pot will automatically turn off or keep warm. This means that when cooking rice (100 degrees Celsius), teflon does not decompose. If accidentally eaten, this inert substance does not react with the body's cells but is excreted.
The most harmful thing is to use it for the wrong purpose. There are families who use the core of the rice cooker to cook, fry at high temperatures, causing the teflon to decompose strongly. It is especially dangerous when using the core to cook sour foods, because acidic foods will easily corrode the metal layer.
Dr. Tan advises that Teflon is like microplastic, once the non-stick coating has peeled off, it should no longer be used to cook rice.
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