Correlation of the free radical and antioxidant activities of Eriobotrya Japonica Lindl. with phenolic and flavonoid contents

Abstract This study was conducted to compare the correlations between antioxidant activity and free radicals. Total Polyphenol and Flavonoid contents were the highest 31.97 ± 1.29 mg TAE/g and 96.1 ± 0.31 mg CE/g in hot water extract, respectively. FRAP activity was highest at 559.17 ± 2.69 mg TE/g in 60% EtOH extract. The RC50 values of DPPH and ABTS radical scavenging activity were lowest at 61.96 ± 5.01 μg/mL in 80% EtOH, 73.81 ± 0.16 μg/mL in 60% EtOH, respectively. The RC50 values of hydrogen peroxide scavenging activity and NO radical scavenging activity were lowest at 265.33 ± 3.88 μg/mL in 60% EtOH and 52.51 ± 8.54 μg/mL in hot water extract, respectively. The total polyphenol and flavonoid contents had significant correlation with the free radical scavenging ability and electron donating ability. On the other hand, there was confirmed significant correlation of free radical and antioxidant activities.