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Flow Injection Amperometric Determination of Pharmaceuticals

A new method is proposed for the flow injection determination of nicardipine and OPAP, [N‐(2‐oxo‐1‐pyrrolidinyl)‐acetyl]‐N′‐(3‐phenylprop‐2‐en‐2‐yl)piperazine, with amperometric detection at a fixed potential by oxidation on a glassy carbon electrode. The influence of the injected volume, flow rate, pH and electrolyte composition on the sensitivity is studied. In the proposed method, the effect of the analyte adsorption on the electrode surface is overcome. The response is linear over the range 0.3–50 mg/L for OPAP and 0.2–16 mg/L for nicardipine, their respective detection limits being 0.1 and 0.05 mg/L.