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Inhibition of linoleic acid oxidation by African yam bean seed protein hydrolysate (APH) and its ultrafiltration membrane fractions. Concentrations of APH, peptide fractions, glutathione (GSH) and butylated hydroxyl toluene: A, 1 mg/mL; B, 0.5 mg/mL; C, 0.25 mg/mL.
