Non-flavonoids
Phenolic acidsPhenolic acids, also called phenolcarboxylic acids, are a group of natural phenolics pervasive in different parts of plants viz. exocarp of fruits, seeds, leaves, and plant petiole. These compounds have been divided into hydroxycinnamic acids and hydroxybenzoic acids (Kumar and Goel 2019, Cosme et al. 2020). Typical sources of hydroxycinnamic acid include red wine, wheat, coffee and fruits such as cherries and kiwis. Phenolic acids are rarely found in free form