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), [S. l.], v. 9, n. 1, p. 29–33, 2024. DOI: 10.53342/pharmasci.v9i1.388. Disponível em: https://ejournal.akfarsurabaya.ac.id/index.php/jps/article/view/388. Acesso em: 26 oct. 2025.