Tobing JH, Ricky DR, Sari DN. THE ANTIOXIDANT ACTIVITY OF THE EXTRACT OF AFRICAN LEAVES (VERNONIA AMYGDALINA) USING 1,1-DIPHENYL-2- PICRYLHYDRAZYL (DPPH) METHOD. isc [Internet]. 2016Oct.25 [cited 2024Nov.22];4(1):74. Available from: https://jurnal.unai.edu/index.php/isc/article/view/1845