Cytotoxicity and Biological Activities of Geopopolis Extract from the Stingless bee (Melipona scutellaris) in Isolates of Staphylococcus aureus

Abstract

This work aims to evaluate the biological activities of the EEGP, in order to contribute with a natural therapeutic alternative, to face infections. The EEGP MIC tests showed antibacterial activity against two strains of S. aureus (LPM 63 and LPM 86), both at concentrations of 550 µg/mL. The MBC performed with the inhibition values showed that the EEGP has bacteriostatic activity in both strains. Biofilm inhibition rates exhibited an average value greater than 65% at the highest concentration. The EEGP antioxidant potential test showed good antioxidant activity (IC50) of 11.05 ± 1.55 µg/mL. In the cytotoxicity test against HaCat cells, after 24 hours, EEGP induced cell viability at the three tested concentrations (550 µg/mL: 81.68 ± 3.79%; 1100 µg/mL: 67.10 ± 3.76 % ;2200 µg/mL: 67.40 ± 1.86%). In view of the above, the safe use of EEGP from the brazilian northeast could be proven by the cytotoxicity test, and its use as an antioxidant and antibacterial agent has proven to be effective, as an alternative in combating oxidative stress and microorganisms such as S. aureus, which, through the spread and ongoing evolution of drug resistance, generates an active search for effective solutions.