Dian Fatimatus Salwa, Tatiana Siska Wardani, and Bangkit Riska Permata. 2026. “Antibacterial Activity Test Of Extracts And Fractionsn-Hexane, Ethyl Acetate, And Pineapple Peel Water (Ananas Comosus(L.) Merr.) Against Bacteria Propionibacterium Acnes ATCC 6919”. International Journal of Health Engineering and Technology 4 (6). https://doi.org/10.55227/ijhet.v4i6.655.