A new fluorometric method for latamoxef in biological materials using 2,6-diamino-3-nitrosopyridine.
作者:AKIO MATSUURA、TAKAYASU KITAGAWA、EIZO HIRAI
DOI:10.1248/cpb.33.667
日期:——
A novel fluorometric assay method was established for latamoxef (LMOX), a new type of antibiotic. LMOX was converted into 1, 2, 4-dihydroxy-3-[(1-methyltetrazol-5-ylthio) methyl] but-2-enoic acid γ-lactone, in an acid solution. The lactone 1 reacted with 2, 6-diamino-3-nitrosopyridine to give the fluorophore, 3-(5-amino-3H-imidazo [4, 5-b] pyridin-2-yl)-2, 4-dihydroxybut-2-enoic acid γ-lactone. The fluorescence was measured at 460 nm with excitation at 392 nm. In plasma and urine, 1-15 μg/ml and 20-300 μg/ml of LMOX were determined, respectively, with good precision through a simple technique. The sample volume was 100 μl. The reaction mechanism of the fluorescence reaction is discussed.
建立了新型抗生素拉氧头孢(LMOX)的荧光测定方法。LMOX 在酸性溶液中转化为 1, 2, 4-二羟基-3-[(1-甲基四唑-5-基硫基)甲基] 丁-2-烯酸 γ-内酯。内酯 1 与 2,6-二氨基-3-亚硝基吡啶反应生成荧光体 3-(5-氨基-3H-咪唑并[4,5-b] 吡啶-2-基)-2,4-二羟基丁-2-烯酸 γ-内酯。荧光在 460 纳米波长处测量,激发波长为 392 纳米波长。通过简单的技术分别测定了血浆和尿液中 1-15 μg/ml 和 20-300 μg/ml的 LMOX,精确度良好。样品量为 100 μl。讨论了荧光反应的反应机理。