Polyphenol oxidase (PPO) is an enzyme found in various ... Maximum Velocity (V max): The maximum rate of reaction achieved by an enzyme at saturating substrate concentrations.

Acid has been proven to slow down the reaction between polyphenol oxidase and oxygen, and acidic lemon or lime juice easily does the trick. As Diana Manalang points out, a squeeze of citrus also ...

It's a process called oxidation, and it happens when the oxygen reacts with compounds called polyphenols with the help of enzymes called polyphenol oxidase. This damages the tissue of the flesh ...