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High-performance liquid chromatography (HPLC) of the aqueous extract of Hibiscus sabdariffa. (a) Coelution of H. sabdariffa extract, RT = 15.74 min 254 nm, (b) coinjection of standard rutin, RT = 15.78 min 254 nm and (c) rutin, RT = 15.74 min 360 nm.
