Electrical circuit for electrochemical measurement and measurement device
An electrochemical and current measurement technology, which is used in measurement devices, material electrochemical variables, scientific instruments, etc., to achieve the effect of improving measurement accuracy
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no. 1 approach
[0038]
[0039] figure 1 It is a circuit block diagram showing the configuration of a measuring device according to an embodiment (first embodiment) of the present disclosure. The measuring device 1 is a device for electrochemically measuring a solution. The measurement device 1 can also detect and quantify a substance to be measured in a solution. figure 1 The shown measurement device 1 includes an electric circuit 10 , a container 90 for containing a solution, a counter electrode 91 arranged in the container 90 and in contact with a solution 95 during measurement, a reference electrode 92 , and a working electrode 93 . The electric circuit 10 includes a voltage generating circuit (voltage generating unit, voltage generator) 20 , an operational amplifier 30 , a capacitor 40 , and a current measuring circuit (current measuring unit, current measuring device) 50 . A part or all of the voltage generation circuit 20, the operational amplifier 30, the capacitor 40, and the cur...
Embodiment 1
[0074] Here, one embodiment included in the present disclosure will be described. As the counter electrode 91, a platinum electrode having an area of about 4 square millimeters was used. As the working electrode 93, a platinum electrode of about 10 square millimeters was used, and a fructoamino acid oxidation (FAOD) enzyme film for measuring glycated albumin was formed on the surface thereof. As the reference electrode 92, a platinum electrode of about 2 square millimeters was used, and silver silver chloride was arranged on the surface thereof.
[0075] In the state where a voltage of 450 mV was applied between the counter electrode 91 and the working electrode 93, the three electrodes were immersed in a 300 mM trimethylolmethylaminoethanesulfonic acid (TES) solution as a good buffer. status was measured. The noise waveform at this time is as figure 2 , image 3 , Figure 4 shown. figure 2 Noise waveforms measured without implementing the noise countermeasures of th...
Embodiment 2
[0079] In this example, TES not containing glycated albumin was introduced into container 90, immersed in counter electrode 91, reference electrode 92, and working electrode 93, and replaced (replaced) with glycated albumin dissolved at 1 mg / mL. TES. For this solution, the current waveform measured under the same conditions as in Example 1 is as follows: Figure 5 , Figure 6 shown. Figure 5 An example of a current waveform is shown when measures to reduce external noise are taken by shielding or appropriate ground arrangement. Figure 6 A current waveform when a capacitor of 10 μF is arranged as the capacitor 40 is shown.
[0080] Figure 5 , Figure 6 In the respective graphs, the solutions were replaced at 28 seconds and 32 seconds. When the solution was changed, the current value increased sharply (in these figures, the direction below the graph refers to the increase in current due to the relationship of the measurement system). Then, the electric current stabiliz...
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