Putri YN, Nasution MA, Ridwanto R, Daulay AS. Determination of total phenolic content of ethanol extract, ethyl acetate and n-hexan fraction of robusta coffee leaves (Coffea canephora Pierre ex A. Froehner) using Uv-Vis spectrofotometry method. JPS [Internet]. 2023 Nov. 15 [cited 2024 Nov. 21];6(4):1709-16. Available from: https://journal-jps.com/new/index.php/jps/article/view/301