FIGURE 2. (A) Automated apparatus for 18F-FECh synthesis. Reaction vessel is shown close up. Purification module is out of view. (B) Preparative HPLC of 18F-FECh in automated apparatus for 18F-FECh synthesis. Column used was ODS-silica gel column, 250 x 10 mm; solvent, 50 mmol/L phosphoric acid + 1 mmol/L 2-naphthalenesulfonic acid; flow rate, 5 mL/min. Radioactivity "halfway down the column" is reading of detector (detector 1) placed on side of column to watch approach of 18F-FECh. Radioactivity of effluent from column was monitored by another detector (detector 2).
