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- W2158747438 abstract "A method for the determination of lorazepam in rat brain is described using liquid/liquid and solid-phase extraction, followed by high performance liquid chromatography. After addition of chlordiazepoxide as the internal standard, 100 mg brain tissue was homogenized and incubated with alkaline protease. Lorazepam and chlordiazepoxide were extracted three times with toluene. After treatment through a C 18-Bond Elut column, lorazepam and chlordiazepoxide were analyzed isocratically on a reversed-phase column with a mobile phase consisting of methanol + 0.025 M sodium phosphate buffer (66:34, v/v). The eluted drugs were monitored by their absorption at 240 nm. The sensitivity limit of this method was 10 ng of lorazepam per 100 mg of brain tissue sample. The standard curve was linear over the range of 20 to 200 ng lorazepam. The coefficient of variation for day-to-day precision established by 21 replicate analyses was 4.5 to 13.6%." @default.
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- W2158747438 date "1990-07-01" @default.
- W2158747438 modified "2023-09-24" @default.
- W2158747438 title "Analysis of lorazepam in rat brain using liquid/liquid and solid-phase extraction in combination with high performance liquid chromatography" @default.
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- W2158747438 doi "https://doi.org/10.1002/bmc.1130040412" @default.
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