Comparison Activity Test of Antioxidant of Water Extract Coffee Robusta (Coffea canephora) and Water Extract Coffee Arabica (Coffea arabica) with the Method DPPH (1,1-difenil-2-pikrilhidrazil). ijlsar [Internet]. 2024 Jul. 30 [cited 2025 Apr. 3];3(07):633-7. Available from: https://ijlsar.org/index.php/ijlsar/article/view/325