Evaluation of total polyphenol content, total flavonoid content, and antioxidant activity of <i>Plectranthus amboinicus</i> leaves

Plectranthus amboinicus (Lour.) Spreng is a valuable medicinal plant that has been used for a long time in Vietnam. Previous studies have shown that Plectranthus amboinicus exhibited several useful pharmacological effects. This study evaluated total polyphenol, flavonoid contents and anti-oxidant potential of the leaf extract of Plectranthus amboinicus. The phenolic content and flavonoid content achieved 26,84 ±0.91 μg GAE/mg and 12,14 ± 0,42 μg QE/mg, respectively. Ethanol extract (IC50 = 48,23 μg/ml) showed potent antioxidant activity. According to the results of the present investigation, the plant showed significant antioxidant activity that is applicable for the treatment of various diseases.