Many manufactured products such as dyes and oils, among others, have in their composition phenolic compounds that are of natural origin . They are present in vegetables in free form or linked to sugars (glycosides) and proteins . These compounds also lead to the polymerization of natural polyphenols such as lignin and melanin, besides forming an important class of antioxidants, which inhibit the oxidative degradation of organic or bio-organic molecules . The antioxidant activity of phenols against free radicals comes from their elimination role, which is related to their ability to react with radicals much more quickly than other organic substrates. For example, tocopherol (vitamin E) is mentioned as an efficient capture agent that can eliminate harmful peroxide radicals in the blood plasma .