Fig. 4.
HPLC profiles of (A) a standard sample of 14C-1,25(OH)2D3-3-BE, and (B) organic extract of a sample of human serum, spiked with 14C-1,25(OH)2D3-3-BE. Conditions: C18 column, 5% H2O-MeOH: mobile phase, on-line radioactivity-detection. The experiment was repeated three times and representative data shown.
