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High performance liquid chromatogram of RES and internal standard in rat plasma. (A) Chromatograms of blank plasma; (B) blank plasma containing RES and internal standard; (C) rat plasma was taken 1 h after a single tail vein injection of GL-HSA-RES-NPs (contains 6 mg/kg RES). Peak 1: RES (retention time = 5.5 min); Peak 2: phloretin (retention time = 9.7 min).
