Abstract
Since the discovery of HP (Helicobacter pylori) and its close association with gastritis and peptic ulceration, it has been important to establish a practical method for conveniently testing HP infection. Because of the strong urease activity of HP, the urea administered orally is broken down into NH3 and CO2 by the HP urease in the patient's stomach. Then the NH3 is absorbed by the blood and excreted in the urine. The HP infection can be detected with15N — tracing method,15NH 4 + excretion test, using15N — urea as a tracer compound. Performing on the detection with a optical spectrometer made by us for measuring the15N — abundance in the urine is reported.
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