Total Phenolic and Flavonoid Content and Evaluation of Antioxidant Activity of Roselle (Hibiscus sabdariffa), Lemongrass (Cymbopogon citratus), and Ginger (Zingiber officinale) Combination Extract Based on FRAP Methods. JFM [Internet]. 2026 Oct. 30 [cited 2026 Nov. 1];9(1):293-8. Available from: https://ejournal.medistra.ac.id/index.php/JFM/article/view/3914