Abstract: Polyphenols from Terminalia fruits were purified by macroporous resin adsorption. AB-8 macroporous resin showed the best adsorption and desorption capacity among 7 resins tested. The best results for the purification of polyphenols from Terminalia fruits with AB-8 macroporous resin were achieved by adsorption at a sample loading flow rate of 3.0 BV/h, pH 6.0 and sample concentrations below 2.0 mg/mL and subsequent desorption with 3.0 BV of 80% ethanol at a flow rate of 2.0 BV/h. Under these conditions, the content of purified Terminalia polyphenols was 78.4%. The antioxidant effects of Terminalia polyphenols alone or in combination with citric acid on lard oil were studied. The results showed that a mixture of Terminalia polyphenols and citric acid at a ratio of 4:1 had the best antioxidant effect at the dose of 0.04%. Thus, the combination of Terminalia polyphenols and citric acid has excellent lipid peroxidation inhibitory effect.

Key words: Terminalia polyphenols, macroporous resin, purification, oil, citric acid, antioxidant activity