Abstract
Callistemon citrinus, an evergreen tree or shrub, has been used as an ornamental tree. It also has been utilized in Asian traditional medicine. The pharmacological properties of Callistemon citrinus are widely studied. This study was performed to screen phytochemicals and antioxidant activities of C. citrinus leaf methanolic extract. The results indicated that C. citrinus leaf extracts contain carbohydrates, saponins, tannins, flavonoids, quinones, terpenoids, triterpenoids, phenolics, and steroids; in which total phenolic compounds content is 316.36 mg of GAE/g. As regards antioxidant activities, C. citrinus leaf extracts exhibited a strong DPPH and ABTS scavenging activity, with IC 50 value of 24.50 µg/mL and 46.64 µg/mL, respectively. From the above findings, it can be concluded that C. citrinus leaves have a remarkable bioactivity and could be used as a potential candidate for the development of pharmaceutical and cosmetic purposes.
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