Received: Jun 12, 2023 / Published: Dec 30, 2023
This study examined the phytochemical composition and algicidal effectiveness of Ludwigia octovalvis. The powder samples were extracted by ultrasound-assisted extraction with polar solvents (water-diluted ethanol, acetone, methanol, and water). The preliminary phytochemical analyses used standard procedures following Sofowora and Harborne. Total phenolic contents in extracts were determined by the Folin-Ciocalteu method using a calibration curve of gallic acid. The results showed that this plant contains polyphenols, flavonoids, anthraquinones, glycosides, and saponins. The best conditions for the extraction of polyphenol compounds with a total polyphenol content of 149.22 ± 0.96 mg GAE g-1 were acetone/water 70:30 (v/v) and a solvent-to-material ratio of 20 mL g-1. The inhibitory effect of the extracts against M. aeruginosa growth increased from 40.71 to 81.56% on day 7 when exposed to concentrations of the extract from 50-200 μg mL-1 according to the cell counting method. The L. octovalvis extract was identified as an effective inhibitor of the growth of M. aeruginosa.
