Abstract
Mature dark red seeds of cowpea (Vigna unguiculata (L.) Walp.) UPL Cp 3, were subjected to several soaking treatments to remove their polyphenols. Soaking in water at room temperature for 8 and 24 h resulted in 17% and 21% loss of assayable polyphenols, respectively. Dilute solutions of alkali (Na2CO3, NaHCO3, NH4OH and KOH) and acid (CH3 COOH, HCl and H2 SO4) were more effective in removing polyphenols up to 88% than higher concentrations of alkali and acid solutions.
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