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Specimen handling and high-performance liquid chromatographic determination of furosemide

, : Specimen handling and high-performance liquid chromatographic determination of furosemide. Journal of Chromatography 229(1): 129-139

A simple high-performance liquid chromatographic method to measure furosemide in plasma and urine is described. Furosemide fluoresces best, but is unstable, at acidic pH and is subject to photochemical degradation. These factors were analysed and the results prompted changes in previously described methods. All specimens were very carefully protected from light; extraction and acidification were done with acetic acid instead of hydrochloric acid. With these precautions no 4-chloro-5-sulphamoylanthranilic acid was found in biological specimens. The main metabolite was furosemide glucuronide (20% of furosemide excretion). Sensitivity was 0.1 and 0.5 microgram/ml for plasma and urine, respectively. The applicability of our method for furosemide studies is demonstrated.

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Accession: 044374971

PMID: 7085820

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