Pop those ‘BPA-free’ drinking bottles into the dishwasher before using them

As part of a laboratory experiment, Rebecca Holmes examined water bottles that had been acquired from abroad expecting to find bisphenol A (BPA), a human-made component commonly found in polycarbonate plastics used to make consumer products.

What she found, however, was that those water bottles were just fine, yet some control bottles purchased in the United States and supposedly BPA-free actually contained traces of the chemical now thought to negatively impact heart health.

“Water bottles are ubiquitous on college campuses,” says Wang. “While most of the bottles we tested were indeed BPA-free our study showed that there is a possibility that some may have BPA contamination. If you are concerned about the possibility that the BPA-free bottles are contaminated, washing the bottles after purchase is a good idea.  Dishwashing is an effective way of removing the contamination in the specific kind of bottle we tested.”

Wang says it is also a good idea to follow a manufacturer's wash instructions on water bottles or other containers.

Researchers washed the Tritan bottles that showed release of BPA up to six times, and at that point there was no longer any detectable release of BPA. A past study by a different group of researchers shows rinsing was effective in removing BPA release from the Tritan bottles they tested, so effectiveness of washing methods likely depends on the specific bottle. 

The bioactivity of the leached BPA from the bottles in the UC study was confirmed by examining the cardiovascular systems of transparent blackworms and the heart tissue of mice exposed to water in these containers over a seven-day period.

“BPA is an endocrine disruptor, and it acts like estrogen and it can affect the cardiovascular system along with other systems,” says Holmes. “It can contribute to  irregular heart rhythms.”

Wang explains that as part of the team’s project Holmes visited a plastics manufacturing factory to get a better understanding of how BPA might have gotten onto BPA-free containers.

 “I wanted to go to a plant to see how plastic products are made,” says Holmes. “I was able to tour the facility and none of the products in this facility were for consumer purposes. It was to see how the process works. What I found is that similar products with different types of plastic were being made closely together.”

Syam Andra, PhD, associate professor of environmental medicine and public health at Icahn School of Medicine at Mount Sinai, New York City, was also a co-author on the research study. 

The study was supported by the National Institutes of Health R01ES027855, University of Cincinnati Center for Environmental Genetics through the NIEHS award P30ES006096, and NIH/NIEHS funding from NIH/NIEHS U2C ES026561 and P30ES023515.

Featured image at top: Jianyong Ma, PhD, Hong-Sheng Wang, PhD, and Rebecca Holmes work in a UC College of Medicine lab. Photo/Colleen Kelley/UC Creative + Brand