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An estimation of 7,8-dihydro-6-hydroxylumazine in urinary samples of mice by high performance liquid chromatography on reversed phase material is presented. Urinary samples are diluted with water and oxidized by iodine. Chromatographic elution is done isocratically using aqueous buffer containing methanol. Effluent 6-hydroxylumazine is monitored by its fluorescence (382 nm excitation, 449 nm emission). The described method can be performed rapidly with satisfactory accuracy and precision. The electrochemical detection of 7,8-dihydro-6-hydroxylumazine was studied additionally. Total values of daily excreted 7,8-dihydro-6-hydroxylumazine of healthy and of Ehrlich ascites tumour-bearing mice were measured.

Measurement of Urinary 7,8-Dihydro-6-hydroxylumazine in Healthy and in Ehrlich Ascites Tumour-Bearing Mice