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Parsea americana Mill. is a natural resource that has been studied for its antibacterial properties. The pulp, peel, and seed of Parsea americana Mill. have potential as an antibacterial agent. This study aimed to determine the inhibitory activity and phenolic content of Parsea americana Mill. peels extract and fraction against Staphylococcus aureus ATCC 25923. Parsea americana Mill. was macerated with 96% ethanol and then fractionated with n-hexane, ethyl acetate, and methanol solvent. Determination of the fraction that has the greatest antibacterial activity against S. aureus was carried out using the Kirby Bauer method. The total phenolic content in the extract and fraction was calculated as gallic acid equivalent (GAE) using the Folin-Ciocalteu method spectrometrically. Antibacterial activity test of the 96% ethanol extract, ethyl acetate fractions, and methanol fractions at a concentration of 10% w/v showed activity with a measurable inhibition zone. On the other hand, the n-hexane fraction showed no inhibition zone. The highest inhibition zone was the ethyl acetate fraction with approximately 8.33 ± 0.58 mm. The ethyl acetate fraction of Parsea americana Mill. resulted in 536.26 ± 14.29 mg GAE/g fraction. The conclusion was that the ethyl acetate fraction had the highest total phenolic content and was the most active fraction in inhibiting the growth of Staphylococcus aureus.

This study aims to determine the antibacterial activity and TLC-bioautography profile of the active fractions of Muntingia calabura L. leaves against Staphylococcus aureus. Muntingia calabura L. leaves were macerated with ethanol 96% then fractionated with n-hexane, ethyl acetate, and methanol solvent, respectively. The antibacterial activity was tested by the Kirby-Bauer method to determine the most active fraction and the lowest concentration that inhibited the growth of Staphylococcus aureus. TLC-bioautography was tested using chloroform: ethyl acetate (2:8) as the mobile phase and silica gel F254 as the stationary phase. Antibacterial activity test of n-hexane and ethyl acetate fractions at a concentration of 10% w/v showed activities with inhibition zone diameter of 0.330.288 and 9.665.77 mm, respectively. At the same time, the methanol fraction showed no activity. The lowest concentration of ethyl acetate fraction which still showed the inhibition zone was 0.312% w/v. The TLC-bioautography profile showed active spots with an Rf value of 0.82 and had an inhibitory zone diameter of 4.0130.864 mm. It can be concluded that the ethyl acetate fraction was the most active fraction that inhibited the growth of Staphylococcus aureus and had one active spot on the bioautography test.

Roselle (Hibiscus sabdariffa L.) has been known as traditional medicinal plants. It needed to evaluate the safety of roselle extract on long-term oral administration. The research aimed to determine the savety of ethanolic extract of roselle calyx. Subchronic toxicity study of ethanolic extract of roselle calyx had been carried out on 60 Sprague Dawleys (SD) rats for 28 days. The roselle extract was administered orally every day, with doses of 50,100 and 200 mg/kgBW. There are 2 satellite groups, kept for another 14 days after the treatment in order to detect a delayed occurrence of toxic effect. Satellite group was given extract 200 mg/kgBW for 28 days and followed aquadest treatment for 14 days. At the end of experiment the blood was collected for meansuring SGPT, SGOT and ALP activity. The result showed that treatment of roselle calyx extract had no significant changes in SGPT SGOT, ALP activity. The delayed effect was not also observed. The ethanolic extract of roselle calyx didn’t show toxic effects on the liver on subchronic administration.