Antioxidant Activity of Various Solvent Extracts From Endophytic Bacteria Isolated From Girang (Leea Indica) Leaves

The study found that the BT4 isolate of Bacillus tequilensis from Leea indica leaves exhibited strong antioxidant activity, particularly when extracted with n-butanol, achieving an IC50 of 59.021±0.541 µg/mL. This extract also had high flavonoid and phenolic contents, measuring 4.686±0.476 mgQE/g and 31.406±0.716 mgGAE/g, respectively. The presence of bioactive compounds such as flavonoids, saponins, tannins, terpenoids, and steroids in the BT4 isolate suggests that endophytic bacteria from L. indica leaves could serve as a valuable source of natural antioxidants.