**1. Introduction**

Anthocyanins, also known as anthocyanidins, contain acidic and alkaline groups. It belongs to flavonoid compounds with phenolic substances. They exist in various plants in the form of water-soluble natural pigments, and they are the main colorant of plants. Anthocyanins are widely found in flowering plants (angiosperms) of 27 families of 72 species and major 6 anthocyanins, such as *Pelargonium hortorum* pigment, *Centaurea cyanus* L. pigment, *Consolida ajacis* (L.) schur pigment, and other anthocyanins pigment to be found in these plants [1]. In the present, many studies have indicated that anthocyanins are the most effective antioxidants, and their antioxidant property is 50 folds higher than vitamin E and 20 times higher than vitamin C [2]. Anthocyanins, as a natural antioxidant, have

been widely used in the medical treatment, health care, cosmetology, and food supplement and especially in human health and disease prevention.
