| 摘要 |
<p>An amperometric measuring system for measuring the concentration of glucose in solution is disclosed. This system uses the enzyme glucose oxidase immobilized on glass beads to convert a continuously drawn sample to hydrogen peroxide and gluconic acid. A flow-through amperometric cell with a small bore flow path is provided to measure the concentration of hydrogen peroxide. The cell includes a cylindrical measuring electrode which carries the sample through its relatively long narrow bore, a counter electrode and a reference electrode interposed between the measuring and counter electrodes with a differential amplifier for automatically adjusting the current between the measuring and counter electrodes to maintain the potential between the measuring and reference electrode at a predetermined value as fed to one input of the amplifier. The current from the measuring electrode is measured as an indication of the concentration of hydrogen peroxide in the solution and hence the glucose concentration.</p> |
