Polyphenols and carotenoids are the two main kinds of antioxidant phytochemicals, and they contribute the most to the antioxidant properties of foods/plants. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6331972/

Check https://pubmed.ncbi.nlm.nih.gov/26501271/

Polyphenols and carotenoids are molecules that have potent antioxidant activity because they sometimes act synergistically in the oxidation system, where polyphenols act as scavengers, while carotenoids act as chelators of free radicals.

Abdur Rauf Manal Hadi Kanaan Chinaza Godswill Awuchi The natural antioxidants from plant materials are mainly polyphenols (phenolic acids, flavonoids, anthocyanins, lignans and stilbenes), carotenoids (xanthophylls and carotenes) and vitamins (vitamin E and C)

Thanks Chinaza Godswill Awuchi, Manal Hadi Kanaan and Kashif Ameer

Rumex vesicarius. Capparis spinosa.

Apiaceous species

Dear Ali F Almehemdi my question is which class of isolated compounds?

mainly polyphenols (phenolic acids, flavonoids, anthocyanins, lignans and stilbenes), carotenoids (xanthophylls and carotenes) and vitamins (vitamin E and C)

Basically, antioxidant potential is more in polyphenols, and vitamins because they act as proton/electron donor which is required reduction of oxidant species.

yes sure agree with Chukwuma Ifeoma

Hello,

antioxidant acitivity is generally extremely high in polyphenolic compounds e.g. condensed and hydrolysable tannins, flavonoids, lignans, anthocyanins etc. Of course the individual structure of the phenolic compound is highly important regarding antioxidant activity.

Kind regards, KPL

Hello, dear Klaus Peter Latté thanks

Polyphenolics especially flavonoids followed by phenolic acids, etc and carotenoids.

Polyphenols and flavonoids are the best antioxidant potential

Broccoli, spinach, carrots and potatoes are all high in antioxidants

On the basis of my past research study and literature review I have suggested that the citrus fruits and phenolic compounds having rich in antioxidant activity

Thnaks Subhash Chandra Kothiyal

Silymarin (milk thistle) or Silybum marianum is rich in flavonoids. Many studies have emphasize its antioxidant potentials.

• Very important topic! Amazing. Here in Brazil, biodiversity is gigantic and we have many antioxidant plants and fruits with other functions, such as soothing, laxative, healing and many other purposes, many of our isolated Indians already use. The pequi oil for example, a Brazilian savanna/cerrado fruit (Caryocar brasilense - Cambess., 1828.

Dear Carlos Ac Vasconcelos thanks

polyphenols, phytoalexins, vitamins etc. the one i read about the most is resveratrol, which is a stillbene antioxidant found in grapes, peanuts, blueberries,etc.