Hydroxycinnamic acids (hydroxycinnamates) are a class of Aromatic acids or phenylpropanoids having a C6–C3 skeleton. These compounds are hydroxy derivatives of cinnamic acid.
In the category of phytochemicals that can be found in food, there are :
α-Cyano-4-hydroxycinnamic acidCaffeic acid – burdock, hawthorn, artichoke, pear, basil, thyme, oregano, appleCichoric acidCinnamic acid – aloeChlorogenic acid – echinacea, strawberries, pineapple, coffee, sunflower, blueberriesDiferulic acidsCoumaric acidCoumarin – citrus fruits, maizeFerulic acid (3-methoxy-4-hydroxycinnamic acid) – oats, rice, artichoke, orange, pineapple, apple, peanutSinapinic acid (3,5-dimethoxy-4-hydroxycinnamic acid or sinapic acid)