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Determination of Total Phenolic Content and Antioxidant Activity of Roselle (Hibiscus sabdariffa L.) Calyx and Epicalyx Ethanolic (Alcoholic) Extract.
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ISSN 1810-5386. Available at: <http://journals.uofg.edu.sd/index.php/gjhs/article/view/337>. Date accessed: 21 july 2026.