why do carrots turn brown
The Short AnswerCarrots turn brown due to oxidation. When cut, enzymes inside the carrot are exposed to oxygen which results in enzymatic browning. This discoloration doesn't affect the carrot's safety for eating, but it does impact its aesthetic appeal.
The Science Behind It
Carrots, like many fruits and vegetables, contain enzymes called polyphenol oxidases (PPO). These enzymes, normally sequestered within the plant’s cells, come into contact with phenolic compounds when the carrot is cut or damaged. The presence of oxygen in the air then triggers a chemical reaction, oxidizing the phenolic compounds and producing melanins. These melanins are responsible for the brown pigment we observe. This enzymatic browning is a natural defense mechanism in plants but is perceived as spoilage in food, even though the carrot remains perfectly safe to eat. Storing carrots properly—in water or an airtight container—can slow down this process by limiting oxygen exposure and temperature.
Fun Facts
- Lemon juice can prevent browning since its citric acid inhibits the browning enzyme.
- Enzymatic browning is also responsible for the color in tea and coffee.