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Determination of terbinafine hydrochloride in cat hair by two chromatographic methods.

Terbinafine hydrochloride (terbHCl) concentration on the site of infection with Microsporum canis is a very important indicator of drug effectiveness. Several chromatographic methods exist that can be used for the determination of terbHCl concentration in biological samples. A high performance liquid chromatographic (HPLC) method and a gas chromatographic (GC) method have been compared and critically evaluated for the determination of a terbHCl levels in cat hair. The sensitivity and the linearity of the previously developed HPLC method were 0.25 ng/mL and 0.25-3000 ng/mL, respectively. The limit of quantification (LOQ) was 0.01 microg/g of terbHCl in cat hair, and reproducibility of 96.6% and recovery of 93.8% were achieved using appropriate sample pre-treatment and optimal chromatographic conditions. The sensitivity of the GC method, 25 ng/mL (LOQ 625 ppb), was much lower than that of the HPLC method. The GC method still enables determination of terbHCl in a range of concentrations in cat hair. The reproducibility of terbHCl for the cat hair samples was 95.3% and the recovery was only 70.0%. Both methods can be used for the evaluation of drug effectiveness in cats and both of them require only basic chromatographic equipment that can be found in most analytical laboratories.