THE EFFECT OF VARIATIONS IN CONCENTRATION OF BETEL LEAF ETHANOL EXTRACT IN HAND SANITIZER PREPARATIONS ON THE ANTIBACTERIAL ACTIVITY OF ESCHERICHIA COLI AND STAPHYLOCOCCUS AUREUS. Proceedings OPTIMAL, [S. l.], v. 4, n. 1, 2026. DOI: 10.5281/khncp379. Disponível em: https://proceedings.nuansafajarcemerlang.com/index.php/ico/article/view/235. Acesso em: 5 nov. 2026.