An improved procedure to quantify gentamicin in biological fluids is presented. The antibiotic is isolated from plasma and urine by using a silica column, and measured by reversed-phase chromatography. Pre-column derivatization with o-phthalaldehyde to form fluorescent products for detection is used. The method can accurately measure 0.3 mg of gentamicin per liter, and standard curves showed a linear response in plasma and urine at concentrations ranging from 0 to 10 mg/liter. The different processes described in the literature for aminoglycoside isolation are discussed and evaluated with reference to the present results. Moreover, the
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Cabanes et al. (1991) studied this question.
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