Korelasi Kadar Fenol dan Flavonoid terhadap Indeks Aktivitas Antioksidan Ekstrak Batang Vernonia amygdalina: Correlation of Phenol and Flavonoid Content with Antioxidant Activity Index of Vernonia amygdalina Stem Extracts. J. Sains. Kes. 2024;5(5):652-658. doi:10.30872/jsk.v5i5.561