The antioxidant properties of some endemic barberry genotypes of Iran

In the present research, the antioxidant property of 15 barberry genotypes was assessed by four various methods namely; DPPH, ferric reducing antioxidant power (FRAP), beta-carotene linoleic acid and total antioxidant activity based on TFPL method in Gorgan University of Agricultural Siences and Natural Resources at 2017. The plant materials were 14 seeded berrbery genotypes and a seedless one that already collected from northeastern provinces of Iran. The results of analysis variance showed that the effect of genotype was significant on phenol, flavonoid, anthocyanin, antioxidant capacity of barberry genotypes measured by DPPH, FRAP, beta-carotene linoleic acid and TFPL methods. In this experiment the highest and lowest levels of phenol (169 and 149 mg/g DW) were obtained in Daregaz1 and seedless Birjand genotypes, respectively. Also, Golestan1 and Shirvan5 genotypes had the highest flavonoid (88.6 mg/g) and anthocyanin (619 μmol/g), respectively. The results also showed that the antioxidant properties of barberry fruits were different in all measurement methods. The measured antioxidant capacity by various methods such as DPPH, FRAP, beta-carotene Linoleic acid were the highest in Shirvan4 (63.7 mg/g), seedless Birjand (54.5 μmol/g) and Dargas2 (78%) respectively. The total antioxidant activity based on TFPL method in Golestan3 genotype (29.9 μg/ml) was higher than other genotypes. The results showed that the total antioxidant activity in different barberry genotypes was directly related to phenolic compounds, and genotypes with the higher phenolic compounds, especially total phenols, had higher antioxidant properties. In this study, results of antioxidant activity comparison in different methods for berbery genotypes showed that it was finally determined that the total antioxidant activity based on TFPL method was a better technique for measuring the antioxidant activity in barberry genotypes due to its greater association with antioxidant compounds such as phenols. Furthermore, Daregaz1 genotype had the thigher phenols and therefore showed a high total antioxidant activity, which may be used in clinical studies.