Improved Screening Procedure for Diuretics

Abstract
An improved screening procedure for commonly used diuretics in urine samples is described. The diuretics mixture assayed is quickly and satisfactorily resolved using an HP-Hypersil ODS-C18 column and a mobile phase consisting of acetonitrile/phosphate buffer (pH = 3) in gradient elution mode. Alternatively, acetate buffer (pH = 4) is utilized to improve resolution and sensitivity with more acidic compounds such as ethacrynic acid and probenecid.