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- W2042078309 abstract "This study reports fluorescence high performance liquid chromatography (HPLC) and UV-Vis HPLC methods for the determination of 7-ethoxyresorufin O-deethylase (EROD) and tolbutamide methylhydroxylase (TMH) activities, respectively, using bovine liver microsomes. The detection limits were 0.022 and 5.5 pmol on the column, respectively; intra-day and inter-day precisions (expressed as relative standard deviation) were <10%. Both methods showed enough sensitivity to allow for an accurate determination of enzyme kinetic parameters according to Michaelis-Menten plots and the results were: K(m)=0.23+/-0.051 microM, V(max)=0.488+/-0.035 nmol/min/mg protein for EROD activity, and K(m)=1010+/-155.7 microM, V(max)=0.089+/-0.006 nmol/min/mg protein for TMH activity. An Eadie-Hofstee plot analysis showed that in bovine liver microsomes, EROD and TMH activities followed a monophasic kinetic pattern. alpha-Naphthoflavone, a cytochrome P450 1A1/2 (CYP1A1/2) inhibitor, and sulfaphenazole, a cytochrome P450 2C9 (CYP2C9) inhibitor, decreased EROD and TMH activities, respectively. The sensitivity of the methods allowed the use of microsomes with low enzyme activity, such as those from veal calf liver. Thus, EROD and TMH activities may be adopted as markers for the evaluation of CYP1A and CYP2C9-like activities in liver microsomes from veal and beef cattle." @default.
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- W2042078309 date "2010-01-01" @default.
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- W2042078309 title "High performance liquid chromatography determination of cytochrome P450 1A and 2C activities in bovine liver microsomes." @default.
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- W2042078309 doi "https://doi.org/10.1016/j.tvjl.2008.08.006" @default.
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