Abstract
A method is described for the determination of melanotan-II (MT-II), a synthetic cyclic heptapeptide analog of alpha-melanocyte-stimulating hormone (alpha-MSH), in rat plasma by liquid chromatography/tandem mass spectrometry (LC/MS/MS). The analyte is recovered from plasma by solid-phase extraction (SPE) and subsequently analyzed by LC/MS/MS. A SPE procedure using OASIS 96-well plates is used for extraction of MT-II from rat plasma. Using the described approach a limit of quantitation of 5 ng/mL was achieved in rat plasma. This level of sensitivity allowed the determination of pharmacokinetic parameters, following intravenous administration of MT-II in rat.
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