Pratiwi PD, Astuti NT, Perawati S, Sadli NK, Neldi V, Pondawinata M, et al. Method development and validation of Catechin in aqueous medium by using ultraviolet-visible spectrophotometer. PROCA-UNJA [Internet]. 2025 Nov. 30 [cited 2026 Apr. 22];1(2):980-5. Available from: https://www.online-journal.unja.ac.id/PROCA/article/view/50529