DPPH Antioxidant Activity of 70% Ethanol Extract of Roselle (H. sabdariffa L.) Calyces
Oxidative stress results from an imbalance between reactive species and antioxidant defenses. Roselle (Hibiscus sabdariffa L.) calyces contain phenolic and flavonoid compounds that may contribute to radical-scavenging activity. This study evaluated the phytochemical profile and DPPH radical-scavenging activity of a 70%...