alexa New micromethod for the determination of lamotrigine in human plasma by high-performance liquid chromatography.
Pharmaceutical Sciences

Pharmaceutical Sciences

Pharmaceutica Analytica Acta

Author(s): Londero D, Lo Greco P

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Abstract An extraction procedure and reversed-phase high-performance liquid chromatographic assay is described and validated for the determination of lamotrigine in human plasma. The method involves extraction with chloroform-isopropanol after alkalinization with a carbonate buffer, back-extraction into 0.05\% phosphoric acid and separation by reversed-phase HPLC using a 5-micron Supelco diphenyl column (150 x 4.6 mm I.D.). Quantitation was performed by measurement of the UV absorbance at a wavelength of 265 nm. This method was carried out on 50-200 microliters samples of plasma, depending on whether they were pediatric or adult samples. The lower limit of quantitation was 0.2 microgram/ml using 200 microliters of plasma. A linear response was tested from 0.5 to 20 micrograms/ml. Within- and between-day accuracy and precision were always below 10.0\% at all analysed concentrations. The method selectivity towards the most used antiepileptic drugs has been proven. Satisfactory performances were obtained in the evaluation of samples from epileptic patients.
This article was published in J Chromatogr B Biomed Sci Appl and referenced in Pharmaceutica Analytica Acta

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