“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”. Journal Pharmasci (Journal of Pharmacy and Science), vol. 9, no. 1, June 2024, pp. 29-33, https://doi.org/10.53342/pharmasci.v9i1.388.