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[A microbiological test system for determining dioxidine levels in biological fluids].

A microbiological procedure for determining dioxidine concentrations in biological fluids with using E. coli AB 2472 rec A 16, a reparation deficient strain as a test organism is described. Cell suspension of the strain 24-hour culture is added to 1.2 per cent agar with Hottinger digest (140 mg per cent of amine nitrogen), 3 g/l of disubstituted sodium phosphate and 0.4 per cent of glucose cooled to 50 degrees C. 10 ml of the medium are added to every Petri dish with metallic cylinders put on the agar. After the medium solidification the cylinders are removed and 0.1 ml of the solution being tested is added to every well. The dishes are incubated for 24 hours under anaerobic conditions. The test system sensitivity is 0.2 microgram/ml of dioxidine. The relationship between the growth inhibition zone and the drug concentration is linear within dioxidine concentrations of 0.2 to 3.2 micrograms/ml.