When potatoes, eggplant or apples are peeled or cut, certain enzymes are exposed to air. When an enzyme called polyphenol oxidase, also known as tyrosinase is exposed to oxygen, oxidation takes place, which leads to browning of the surfaces of these fruits.19 апр. 2019 г.
What reaction causes the potatoes to change Colour?
Potatoes, along with apples, pears, bananas, and peaches, contain an enzyme that, when exposed to oxygen, reacts to produce discoloration on the surface of the potato or fruit. Potato skins and fruit peels are the natural ways oxygen is blocked from reaching this enzyme. Once they are removed, oxidation begins.
What caused the potato to brown?
Once they have been peeled and cut, raw potatoes will turn brown quickly. This process, which is called oxidation, happens because potatoes are a naturally starchy vegetable. And when exposed to oxygen, starches turn gray, brown, or even black.
What enzyme causes potatoes to brown?
The enzyme responsible for the browning is called polyphenol oxidase (or PPO).
What causes oxidation in potatoes?
Why Do Potatoes Turn Brown? As soon as you leave out peeled or cut potatoes, the oxidation process begins and the potatoes turn brown. Oxidation is a chemical reaction between the starches and sugars in the potato and the air that does not impact the edibility of the potato but does change its color.
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