Determination of Tannin Content in Mangkokan Leaves (Polyscias scutellaria (Burm.f.) Fosberg) and Guava Leaves (Psidium guajava L.) Using UV-Vis Spectrophotometry. JPS [Internet]. 2025 Dec. 30 [cited 2026 Oct. 24];8(4):3048-57. Available from: https://journal-jps.com/new/index.php/jps/article/view/972