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Easy-Assessment of Levofloxacin and Minocycline in Relevant Biomimetic Media by HPLC-UV Analysis.
Journal of Chromatographic Science 2017 August 2
Simple, economic and environmental friendly high-performance liquid chromatography methods for levofloxacin and minocycline quantification in biomimetic media were developed and validate including their stability at body temperature, an often neglected evaluation parameter. Both methods are similar only differing in the wavelength setting, i.e., for levofloxacin and minocycline quantification the UV detection was set at 284 and at 273 nm, respectively. The separation of both antibiotics was achieved using a reversed-phase column and a mobile phase consisting of acetonitrile and water (15:85) with 0.6% triethylamine, adjusted to pH 3. As an internal standard for levofloxacin quantification, minocycline was used and vice versa. The calibration curves for both methods were linear (r = 0.99) over a concentration range of 0.3-16 μg/mL and 0.5-16 μg/mL for levofloxacin and minocycline, respectively, with precision, accuracy and recovery in agreement with international guidelines requirement. Levofloxacin revealed stability in all media and conditions, including at 37°C, with exception to freeze-thaw cycle conditions. Minocycline presented a more accentuated degradation profile over prolonged time courses, when compared to levofloxacin. Reported data is of utmost interest for pharma and biomaterials fields regarding the research and development of new local drug-delivery-systems containing either of these two antibiotics, namely when monitoring the in vitro release studies of those systems.
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