2024. 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). 9, 1 (Jun. 2024), 29–33. DOI:https://doi.org/10.53342/pharmasci.v9i1.388.