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A specific, sensitive and stable high‐performance liquid chromatographic–tandem mass spectrometry (LC‐MS/MS) method was developed and validated for the quantitative determination of methyl 3‐amino‐6‐methoxythieno [2,3‐b]quinoline‐2‐carboxylate (PU‐48), a novel diuretic thienoquinolin urea transporter inhibitor in rat plasma. In this method, the chromatographic separation of PU‐48 was achieved with...
For the first time, an HPLC method was developed and validated for the determination of stemoninine in plasma after oral and intravenous administration of the extract of the roots of Stemona tuberosa to rats. Plasma samples were analyzed on a Waters reversed‐phase C18 column using a gradient mobile‐phase of eluent A (water containing 0.1% formic acid and 0.2% triethylamine, pH 3.68) and eluent B (acetonitrile–water,...
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