Learn why sunlight is the enemy of turmeric powder. Discover how UV rays can bleach its vibrant color and degrade its quality.
1 Answer
Turmeric turns pale in sunlight due to the degradation of curcumin, its primary pigment and active compound, by ultraviolet (UV) radiation. This process, known as photodegradation, reduces the intensity of the yellow color.
Detailed Explanation:
Turmeric's vibrant yellow color comes from curcuminoids, mainly curcumin, which is a powerful antioxidant and anti-inflammatory compound. When turmeric is exposed to sunlight, specifically the UV rays, the curcumin molecules absorb this energy. This absorbed energy causes the curcumin molecules to break down and degrade. This degradation process, called photodegradation, leads to a reduction in the concentration of curcumin, and consequently, the turmeric loses its intense yellow color, appearing pale or faded. The rate of color change depends on the intensity and duration of sunlight exposure. Other factors like moisture and temperature can also influence the degradation rate, but sunlight is the primary culprit.
Pro Tip:
To preserve the color and potency of turmeric, store it in an airtight container in a cool, dark place, away from direct sunlight and heat. Opaque containers are preferable to clear ones.