Tea-Coated Surfaces

  • Author: Jonathan Faiz
  • Published Date: 07 October 2013
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Tea-Coated Surfaces

Polyphenols, such as tannic acid, are found in plant tissues and have a variety of chemical properties, including radical scavenging. Polyphenol-rich foods and drinks, such as green tea, are also said to have health benefits.


Phillip B. Messersmith and his colleagues at Northwestern University, USA, have come up with a new use for polyphenols: as multifunctional coatings. They observed that when green tea was left in a cup for several hours, a thin polyphenol coating was formed on the vessel. Red wine also behaved similarly. After investigating crude extracts of red wine, cacao beans, and green tea, Messersmith and his team decided to study the properties of pyrogallol and tannic acid as precursors for the deposition of coatings on substrates including gold, titanium oxide, stainless steel, and PTFE.

The polyphenol coatings were found to have a wide range of uses, including killing bacteria, resistance to fouling, and the ability to scavenge radical and nonradical reactive oxygen species (ROS). The coatings could also be used to tune the optical properties of inorganic nanoparticles.


The authors envisage that these "green" coatings derived from polyphenol-rich foods could be used in consumer, industrial, and military applications.


Article Views: 4650

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission and consult our permission guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH