Figure 3

HPLC chromatograms of mono-iodorhein or ¹³¹I-rhein.

(a) ultraviolet-chromatogram of mono-iodorhein; (b) radiochemical purity of ¹³¹I-rhein in injection preparation; (c) in vitro stability of ¹³¹I-rhein after 24 h incubation in rat serum at 37 °C.