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Preparation and evaluation of enrofloxacin microspheres and tissue distribution in rats
Fan Yang,Jijun Kang,Fang Yang,Zhensheng Zhao,Tao Kong,Zhenling Zeng 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.2
New enrofloxacin microspheres were formulated, and their physical properties, lung-targeting ability, and tissue distribution in rats were examined. The microspheres had a regular and round shape. The mean diameter was 10.06 μm, and the diameter of 89.93% of all microspheres ranged from 7.0 μm to 30.0 μm. Tissue distribution of the microspheres was evaluated along with a conventional enrofloxacin preparation after a single intravenous injection (7.5 mg of enrofloxacin/kg bw). The results showed that the elimination half-life (t1/2β) of enrofloxacin from lung was prolonged from 7.94 h for the conventional enrofloxacin to 13.28 h for the microspheres. Area under the lung concentration versus time curve from 0 h to ∞ (AUC0-∞) was increased from 11.66 h·μg/g to 508.00 h·μg/g. The peak concentration (Cmax) in lung was increased from 5.95 μg/g to 93.36 μg/g. Three lung-targeting parameters were further assessed and showed that the microspheres had remarkable lung-targeting capabilities.
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