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. OPTIMAL [Internet]. 2026 Oct. 30 [cited 2026 Nov. 5];4(1). Available from: https://proceedings.nuansafajarcemerlang.com/index.php/ico/article/view/235