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Sakai, Yusuke; Murakami, Eriko; Kato, Hideo; Ohyama, Kaname; Esaka, Yukihiro; Yamamoto, Takuhei; Hagihara, Mao; Mikamo, Hiroshige; Uno, Bunji
Biological & pharmaceutical bulletin, 05/2019, Letnik: 42, Številka: 5Journal Article
It is important to evaluate the amount of daptomycin (DAP) distributed to skeletal muscles to elucidate the mechanisms related to penetration and side effects, such as myopathies. However, no attempt has been made to measure DAP concentrations in skeletal muscles. The study’s aim to investigate the feasibility of trypsin digestion, as a muscle sample preparation technique for the determination of DAP in murine skeletal muscle, was evaluated in conjunction with a conventional HPLC-UV analysis. Compared with trypsin digestion, DAP was less recovered from spiked skeletal muscle by the conventional extraction, including homogenization, centrifugation, and filtration, because of its incorporation into the muscle protein. On the other hand, a sample preparation technique involving enzymatic digestion employing trypsin fully recovered DAP from the spiked skeletal muscle. Based on the spike recovery assay results, we proposed an efficient muscle sample preparation method involving trypsin digestion. HPLC analysis in conjunction with the sample preparation method has successfully determined DAP concentrations of skeletal muscles collected from mice administrated subcutaneously with DAP. The proposed method is suitable for application to investigations that include animal experiments on drug migration into muscle and mechanism underlying skeletal muscle injury as a side reaction, such as myopathies, of DAP therapy.
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in: SICRIS
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