What pigment causes the deep violet hue in purple string beans?

Answer

Anthocyanins

The captivating, deep violet coloration seen in purple string beans is directly attributed to high concentrations of a specific class of compounds known as anthocyanins. These pigments are powerful antioxidants responsible for imparting rich blue, red, or purple shades to various fruits and vegetables, such as blueberries and red cabbage. In the context of these vegetables, anthocyanins are celebrated for their biological role in combating harmful free radicals within the body, which is fundamentally important for maintaining cellular health. Their presence in the purple variety specifically introduces an enhanced dimension of antioxidant potential compared to standard green beans, linking them to support for cardiovascular and cognitive functions.

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