There isn't one specific individual credited with "inventing" the pro-oxidant properties of polyphenols. It's more accurate to say that the understanding of their multifaceted nature, including their pro-oxidant potential, has evolved over time through the work of numerous scientists.

Here's why:

* Polyphenols are complex: Polyphenols are a vast and diverse group of plant compounds with varying structures and biological activities. This makes studying their effects, including both their antioxidant and pro-oxidant properties, complex.

* Understanding has evolved: Early research focused primarily on their antioxidant properties due to their ability to scavenge free radicals. As research progressed, scientists discovered that polyphenols can also act as pro-oxidants under certain conditions. This is influenced by factors like concentration, the presence of metal ions, and the specific polyphenol involved.

* Ongoing research: The study of polyphenol's pro-oxidant effects is ongoing, with scientists investigating the mechanisms and implications of this dual nature.

Instead of attributing the discovery to a single individual, it's more accurate to recognize that:

* Numerous scientists have contributed to understanding the complex nature of polyphenols.

* The field of research is continually evolving, with new discoveries and insights emerging over time.

To learn more, you can search for scientific articles on "polyphenols pro-oxidant effects" or "polyphenol redox properties."