why do lemon change color
The Short AnswerLemons change color due to chlorophyll breaking down as they ripen. This reveals the yellow pigments (carotenoids) that were already present. Ethylene gas, a ripening hormone, triggers this process, impacting the fruit's firmness and acidity, too.
The Science Behind It
The color transformation in lemons is primarily due to the degradation of chlorophyll, the pigment responsible for the green color in unripe lemons. As the fruit matures, ethylene, a natural plant hormone, initiates a cascade of biochemical reactions that break down the chlorophyll molecules. This unmasks underlying pigments called carotenoids, which produce the characteristic yellow hue. Simultaneously, the acidity of the lemon decreases as citric acid is converted into other compounds, and the rind becomes softer. These changes collectively signal the lemon's readiness for consumption, enhancing its flavor profile and nutritional value, due to increases in sugars and other antioxidants.
Fun Facts
- Lemons were once so rare in Europe that they were presented as gifts to royalty.
- The average lemon contains about three tablespoons of juice.