Spectrophotofluorometric Assay for Isoniazid and Acetyl Isoniazid in Plasma Adapted to Pediatric Studies

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Abstract
We modified the micro-scale spectrophotofluorometric method of Miceli et al. [Biochem. Med. 12, 348 (1975)] for the assay of "apparent" isoniazid (isoniazid plus acid-labile hydrazones) to improve its clinical application. We also adapted the method for determination of acetyl isoniazid. Data are presented showing how long plasma containing isoniazid may validly be stored. The applicability of the method was demonstrated in studies on children and small animals.

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