Preliminary Chemical, Total Polyphenol, Total Flavonoid Contents and Antioxidant Activity of Eucalyptus camaldulensis Dehnh.

This study aimed to identify phytochemicals and evaluate antioxidant activities of different extractsfrom Eucalyptus camaldulensis, an aromatic plant in the Myrtaceace family. Examined extracts indifferent solvents such as diethyl ether extract (DEE), the ethanolic extract (EE) and the aqueousextract (AE). Total polyphenol and total flavonoid contents were determined via aluminum chloridecolorimetric method. Antioxidant activity was performed via ABTS and DPPH radical scavengingassays. The results showed that a wide variety of pharmacologically active compounds such as alkaloid,oil, flavonoid, triterpenoid, saponin, tannin and polyphenol were present in the leaves of Eucalyptuscamaldulensis. The result of quantitative determination showed that total polyphenol content of thediethyl ether extract, ethanolic extract and aqueous extract achieved 73.47 ± 1.64, 306.48 ± 3.87 and76.47 ± 1.64 mgGAE/g, respectively. Meanwhile, total flavonoid content was 41.74 ± 2.21, 45.98 ±1.79 and 18.05 ± 0.81 mgQE/g, respectively. The ethanolic extract exhibited the highest DPPH (IC50= 10.52 ± 0.14 μg/mL) and ABTS (IC50 = 9.86 ± 0.17 μg/mL). These results indicate that Eucalyptuscamaldulensis leaves can be used in dietary applications with the potential to reduce oxidative stress.