Flavonoid Concentration and Tyrosinase Inhibition Activity of Ethanol Extract of Piper crocatum (Piper crocatum var. Ruiz & Pav) from Various Regions in Indonesia and Their Correlations. Valensi [Internet]. 2023 May 31 [cited 2025 Nov. 21];9(1):42-5. Available from: https://journal.uinjkt.ac.id/valensi/article/view/31426