Was it stewed in an iron pot or placed in an iron pot? The lotus roots will turn red when cooked in an iron pot

When women are at home, they will cook the blackened lotus roots in an iron pot. At this time, the soup also turned black. Can such lotus roots be eaten? In fact, the blackening of boiled lotus roots is related to the polyphenols chemicals contained in lotus roots. These guys have completely different properties. It can combine with iron ions to form a purple or blue colored complex. Gallic acid, one of the abundant polyphenols in lotus root, combines with iron ions to form a blue-black substance.

The blackening of lotus roots placed in a vegetable basket without contact with any ironware is also the result of this polyphenol substance. The polyphenols in lotus root are oxidized into chemical substances called "quinones" under the action of polyphenol oxidase (PPO). These quinones are then aggregated together to form melanin. In fact, this is the reason why cut apples turn brown and bananas left in the refrigerator turn black.

From this point of view, as long as your lotus roots are fresh, you can eat them even if they turn black