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UC assistant professor Patrick Guerra's work with silk moths inspired his research into the best masks to address the COVID-19 pandemic. Credit: Joseph Fuqua II/UC Creative
With personal protective equipment still in short supply, researchers at the University of Cincinnati examined what common household fabrics might work best as a face covering.
Next to a single-use N95 respirator or surgical mask, UC found the best alternative could be made by a hungry little caterpillar. Silk face masks are comfortable, breathable and repel moisture, which is a desirable trait in fighting an airborne virus.
Perhaps best of all, silk contains natural antimicrobial, antibacterial and antiviral properties that could help ward off the virus, said Patrick Guerra, assistant professor of biology in UC's College of Arts and Sciences.
Studies have shown that copper, in particular, can kill bacteria and viruses on contact. And that's where the little caterpillars have their own superpower, Guerra said.
"Copper is the big craze now. Silk has copper in it. Domesticated silk moths eat mulberry leaves. They incorporate copper from their diet into the silk," Guerra said.
Many health care providers wear a surgical mask in combination with an N95 respirator. The outer covering helps prolong the life of the N95 respirator by keeping it clean. Guerra, whose wife, Evelyn, is a medical doctor, said silk might be an especially good choice for this outer cover as they perform similarly to surgical masks that are in short supply.
UC postdoctoral researcher Adam Parlin holds up a silk face mask. A UC study found that silk masks might work better at repelling COVID-19 than cotton or synthetic masks. Credit: Joseph Fuqua II/UC Creative
"Cotton traps moisture like a sponge. But silk is breathable. It's thinner than cotton and dries really fast," Guerra said.
With COVID-19 surging in parts of the United States, face masks have become a focal point of prevention.
In the UC biology lab, researchers tested cotton and polyester fabric along with multiple types of silk to see how effective a barrier each is for repelling water, representing respiratory droplets containing the virus. They found that silk worked far better as a moisture barrier than either polyester or cotton, both of which absorb water droplets quickly.
UC's study concluded that silk performs similarly to surgical masks when used in conjunction with respirators but has the added advantages of being washable and repelling water, which would translate to helping to keep a person safer from the airborne virus.
"The ongoing hypothesis is that coronavirus is transmitted through respiratory droplets," Guerra said. "If you wore layers of silk, it would prevent the droplets from penetrating and from being absorbed. Recent work by other researchers also found that increasing layers of silk improves filtration efficiency. This means that silk material can repel and filter droplets. And this function improves with the number of layers."
The study was published this month in the journal PLOS ONE.