A differential-pulse polarographic method has been developed for the determination of trimethoprim. The Ep occurs at –1.378 V when the pH of the system is 3.6. Cyclic voltammetry in anhydrous acetonitrile demonstrated that both trimethoprim and sulphamethoxazole could be determined by anodic oxidation at a platinum electrode provided that each was present as a single entity.
L. G. Chatten, B. S. Pons and P. McLeod, Analyst, 1982, 107, 1026 DOI: 10.1039/AN9820701026
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