Method for producing antioxidant and prevention of cancer

A process for producing resveratol in the form of dried white crystals from peanut oil residue and/or from peanut stems comprising:

• (a) extracting a ground dried powder of the peanut oil residue and/or the peanut stems with 95% ethanol to obtain a crude extract;
• (b) mixing and filtering the crude extract to obtain a filtercake and filtrate;
• (c) refluxing the filtercake twice with 95% ethanol in a steam bath to obtain a refluxed extract;
• (d) concentrating the filtrate obtained in step (b) and the refluxed extract obtained in step (c) under reduced pressure, and recovering the ethanol and still residue therefrom;
• (e) extracting the still residue with a mixture of water and ethyl ether;
• (f) separating and recovering the ethyl ether and still residue from step (e);
• (g) adding hot water to the still residue obtained in step (f) in a steam bath to form a suspension;
• (h) cooling and filtering the suspension to obtain a filtrate;
• (i) adding active carbon to the filtrate obtained in step (h) in a steam bath with agitation;
• (j) removing the active carbon by filtration to obtain a filtrate;
• (k) concentrating the filtrate obtained in step (j) under reduced pressure, and cooling the concentrated filtrate;
• (l) crystallizing the concentrated filtrate by adding ethyl ether to the concentrated filtrate to obtain crystals;
• (m) collecting the crystals by filtration;
• (n) dissolving the crystals in 30% NaOH to form a solution;
• (o) decolorizing the solution by contacting the solution with active carbon;
• (p) concentrating the decolorized solution under reduced pressure to obtain white crystals;
• (q) collecting the white crystals by filtration;
• and
• (r) drying the white crystals under vacuum.