Comparison of phytochemicals and their antioxidant activity in seven date palm varieties grown in Iran

In this study, various fruit compounds including phenolic acid, flavonoid, anthocyanin, tannin, moisture content, carotenoid, soluble, and reducing sugar date varieties were investigated. The results showed that there were differences among varieties of date palm in terms of synthesis of chemical compounds. The maximum and minimum SOD, APX, and CAT activity were detected in the Klote and Khasab variety, respectively. The highest amount of phenolic compounds, flavonoids, and anthocyanins were found in a variety of Klote and the lowest amount were observed in the Khenizi variety. The analysis of tannin's content among different date varieties showed that the highest amount of tannin in the Khenizi variety and the lowest amount in the variety of Klote were observed. There is a positive correlation between phenolic compounds and antioxidant capacity in different date palm varieties. The comparison of antioxidant's capacity of different varieties showed that Klote had the highest amount, while Khenizi had the lowest amount of antioxidant. Also, the highest amount of soluble sugar in the Klote and the lowest amount in Khasab were observed. The amount of reducing sugar in the variety of Klote and Gorbani were higher than other varieties and lower level have been seen in Khenizi. The amount of carotenoids was the highest in the Klote variety and the lowest in the Khenazi and Halili varieties. The highest amount of moisture was in the Mazafati and the lowest amount viewed in the Khenizi.