Green tea and salt helped to create a transparent antibacterial coating




polyphenol -antibacterial -coating

Researchers at Northwestern University have found new ways to use the natural properties of polyphenols contained in green tea, red wine and dark chocolate. As it turned out, when dissolved in water polyphenol powder with a small amount of salt is formed non-toxic clear coating with antibacterial and antioxidant properties. High adhesion of polyphenols and low cost materials extends the application of the new coating.

Polyphenol-based coating applied to virtually any surface, including the Teflon, is used as a non-stick surface coating cookware. Polyphenol coating thickness is only 20-100 nanometers, making it ideal for general use.

Adhesive properties of polyphenolic compounds have helped us to find a method for coating a variety of surfaces. This is a simple dip coating process with maintaining antibacterial and antioxidant properties. Take, for example, the implant is made of stainless steel and apply a coating, it will kill the bacteria and block the reactive oxygen species such as free radicals, – professor of biomedical engineering Phillip Messersmith, guiding the research.

Polyphenols are found in the form of molecules in many flowering and fruit-bearing plants are good antioxidants that protect the living body from oxidative stress, and thus slow down the process of aging.

Experimenting with medical and industrial polymers, metals, ceramics and inorganic substrates were immersed in a solution of salt and pyrogallol or tannic acid, a team of scientists led by Messersmita got similar results. In one experiment, they were able to add additional properties of the coating without prejudice to the other properties, in particular, to protect it from fouling. This makes the coating ideal protection against fouling on the pacemaker cells.

Such a coating is useful for human health properties. This can help extend the lifespan of medical devices, reduce inflammation in a patient and prevent bacterial infections, – said other participants.

In fact, the area of ​​possible application of the new coating is wide enough from the food industry and ending with purified water.

The full study was published in the journal Angewandte Chemie.

Wyss Institute at Harvard in the meantime created a transparent superslippery coating with high durability.
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