Abstract
An 80-year-old injection solution of ouabain was analyzed using HPLC–MS. A new separation method involving hydrophilic interaction liquid chromatography (HILIC) using an amide-based stationary phase with mass spectrometric detection was developed for the analysis. The optimized mobile phase composition was acetonitrile:water 85:15 (v/v) at the flow rate of 0.2 cm3/min under the isocratic elution. The ouabain content was found reduced to 56% of declared content and probable degradation product with oxidized hydroxy group was established. The ESI-MS2 fragmentation mechanism of ouabain was proposed.
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The financial support by the projects SVV and Progress Q46 of Charles University is gratefully acknowledged.
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Kudláček, K., Nesměrák, K., Štícha, M. et al. Degradation of ouabain in 80-year-old injection solution studied by HILIC–MS. Monatsh Chem 149, 1555–1560 (2018). https://doi.org/10.1007/s00706-018-2216-9
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DOI: https://doi.org/10.1007/s00706-018-2216-9