Anthocyanin is a water-soluble pigment, which can change color with the pH of cell fluid. Light can increase anthocyanin content; High temperature will degrade anthocyanins. Anthocyanin plays an important role in plant physiology. The colors of petals and fruits are common in the tissues of flowers and fruits, as well as epidermal cells and lower epidermis of stems and leaves. The market price of some fruits is determined by the depth of color.

Procyanidins are bioflavonoids with special molecular structure. It is an efficient auxiliary factor, a natural antioxidant with the strongest activity internationally recognized, a substance for scavenging free radicals and its anti-aging effect.