Quantification of Total Phenol Concentration in Ethanol Extracts of Red and Black Betel Leaves Using UV-Vis Spectrophotometric Method: Penentuan Kandungan Total Fenol Dalam Ekstrak Etanol Daun Sirih Merah dan Hitam Dengan Memanfaatkan Teknik Spektrofotometri. (2024). Journal Pharmasci (Journal of Pharmacy and Science), 9(1), 29-33. https://doi.org/10.53342/pharmasci.v9i1.388