Figure 6

The experimental results of present MOM biosensor for identification and measurement of digoxin concentrations, (a) the percentage of displacement changes in the red pixel intensity profile versus various digoxin concentrations in the range of \(400\;{\text{pM}}\)–\(10\;{\text{nM}}\) for therapeutic drug monitoring, (b) the percentage of displacement changes in the red pixel intensity profile versus various digoxin concentrations in the range of \(1\;{\text{pM}}\)–\(100\;{\text{pM}}\), (c) the percentage of displacement changes in the red pixel intensity profile versus various digoxin concentrations in the range of \(50\;{\text{fM}}\)–\(5\;{\text{pM}}\) dissolved in the plasma-like buffer sample for determining the detection limit of the BioMEMS biosensor, (d) the percentage of displacement changes in the red pixel intensity profile in the cantilever response to solutions with different impurity, (e) the percentage of displacement changes in the red pixel intensity profile per various digoxin concentrations before and after an elution buffer \(\left( {pH 8.7} \right)\) injection, (f) the biosensor stability study by comparing the first test results for the proposed BioMEMS platform and the results obtained after one month (the percentage of displacement changes in the red pixel intensity profile versus various digoxin concentrations).