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Testing and Results


        In this experiment, we test for No pLDH and 1nM groups (which is the detection limit) during experiment. For all experiments performed throughout the development of the present device, no actual saliva samples, infected or not, were used. Instead, pLDH-containing “samples” are formulated by diluting stock pLDH to desired concentrations with PBS. Potassium ferricyanide is included in the solution at a concentration of 0.5 mM. These formulated samples are kept at 2 mL, which is more than sufficient to cover the IDA wheatstone. The result is shown in the figure on the right.

        As showing in the figure, x-axis is frequency and y-axis is voltage output under different frequency. The result shows that under high frequency ( frequency range from 100 kHz to 5 MHz), the change of pLDH concentration will lead to a linear change of voltage output of the electrode. It could also prove that the capacitance change is linear to pLDH concentration.