What happens for these enzymes when the potatoes frying?

When potatoes are fried, enzymes such as polyphenol oxidase and peroxidase can become inactivated due to the high temperatures involved in the frying process. This inactivation prevents enzymatic browning, which can occur in raw potatoes, and helps maintain the desired color and texture of the fried product. Additionally, the heat denatures proteins, further altering the enzymes' structure and rendering them nonfunctional. Ultimately, frying significantly reduces enzyme activity, contributing to the final flavor and appearance of the fried potatoes.