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논문 기본 정보

자료유형
학술저널
저자정보
Ren, Shan (National Research Laboratory for Bioavailability Control, College of Pharmacy, Kangwon National University) Park, Mi-Jin (National Research Laboratory for Bioavailability Control, College of Pharmacy, Kangwon National University) Kim, Ae-Ra (National Research Laboratory for Bioavailability Control, College of Pharmacy, Kangwon National University) Lee, Beom-Jin (National Research Laboratory for Bioavailability Control, College of Pharmacy, Kangwon National University)
저널정보
대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제31권 제3호
발행연도
2008.1
수록면
406 - 413 (8page)

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A reliable method to assess in vitro metabolic stability of rabeprazole and its modulation by Generally Recognized As Safe (GRAS)-listed pharmaceutical excipients was established in human liver microsomes. The metabolic stability of rabeprazole decreased as a function of incubation time, resulting in the formation of thioether rabeprazole via nonenzymatic degradation and enzymatic metabolism, Buffer type was also a determining factor for the degree of both nonenzymatic degradation and enzymatic and enzymatic metabolism. The net extent of enzymatic drug metabolism, obtained by calculating the difference in drug degradation between a microsome-present reaction System and a microsome-free solution, was about $9.20\;{\pm}\; 0.67$% in phosphate buffer and $2.27{\pm}1.76$% in Tris buffer, respectively. Rabeprazole exhibited first-order kinetics in Microsome-free solution but showed non-linear kinetics in the microsome-present reaction system. The maximal velocity, $V_{max}$ in phosphate buffer was 5.07 ${\mu}g\;mL^{-1}\;h^{-1}$ and the michaelis-Menten constant, $K_m$, was 10.39 ${\mu}g\;mL^{-1}$ by computer-fitting to the classical Michaelis-Menten equation for pattern of time-dependent change in the substrate concentration. The intact drug and its thioether form were well resolved and successfully identified by HPLC chromatography and liquid chromatography mass spectroscopy (LC/MS). The metabolic stability of rabeprazole was also modulated by the presence of pharmaceutical excipients. Among the five pharmaceutical excipients tested, poloxamer 188 and Gelucire 44/14 had potentially inhibitory effects on rabeprazole metabolism in human liver microsomes (p < 0.05). A greater understanding of metabolic stability and its modulation by pharmaceutical excipients would be useful for optimizing the bioavailability of rabeprazole at the early formulation stages.

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