Abstract
In vitro diagnostic technologies, used to evaluate disease status at the point-of-care (POC), are of urgent importance to improve diagnostic capabilities in bladder cancer. However, currently available approaches have a limitation because of their lack of detection for early-staged cancer. Herein, we developed an electrochemical immunosensor for the POC diagnosis of bladder cancer in which the enzyme alkaline phosphatase (ALP) and its metabolite, ascorbic acid 2-phosphate (AAP), are employed as the electrochemical label and redox signaling unit. The indium tin oxide (ITO) electrode exhibits no redox activity toward the AAP substrate, whereas its metabolic add of ascorbic acid (AA) produces strong oxidation current under the voltammetric measurement. The ITO electrode and the ALP enzyme are revealed as an excellent combination for the development of the electrochemical immunosensors in both direct- and sandwich-type immunoassay approach. Determination of apolipoprotein-A4 and metallopeptidase-9, two representative bladder cancer markers, were used to evaluate our approach, and excellent quantification with standard deviation 10 % was achieved. Overall, our results showed that our method offers an opportunity for the development of a variety of new forms of portable POC diagnostic devices with low cost and excellent performance.
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This work was financially supported by the Bio & Medical Technology Development Program of the National Research Foundation (grant no. NRF-2015M3A9E2028480), and by the research funds (grant no. 10077648) of the Ministry of trade, Industry and Energy, Korea.
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Song, S., Kim, Y.J., Shin, IS. et al. Electrochemical Immunoassay Based on Indium Tin Oxide Activity Toward a Alkaline Phosphatase. BioChip J 13, 387–393 (2019). https://doi.org/10.1007/s13206-019-3410-5
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DOI: https://doi.org/10.1007/s13206-019-3410-5