A fluorescence-based device was developed for immunosuppressants. A measuring chip with ten parallel microchannels allows the simultaneous detection of more than one analyte with replicate measurements. The device is equipped with a microfluidic circuitry, which handles the sample mixing with necessary chemicals using an additional chip and its pumping into the measuring chip, and with integrated thin-film amorphous silicon photodiodes for the fluorescence detection. Submicrometric fluorescent magnetic particles are used to improve the efficiency of the assay. Results on the measurements of mycophenolic acid and cyclosporine A in both spiked solutions and microdialysate samples from patient blood are reported.
A novel therapeutic drug monitoring point of care testing (POCT) optical device for the detection of immunosuppressants in transplanted patients was designed and tested, with the body interface constituted by an intravascular microdialysis catheter (MicroEye®) which provides the dialysate as clinical sample. An optical biochip with 10 microchannels, based on total internal reflection fluorescence (TIRF), enables the frequent measurement of immunosuppressants. Heterogeneous competitive immunoassays for the detection of mycophenolic acid, tacrolimus and cyclosporine A are implemented on the different microchannels, with the derivative of the immunosuppressants immobilised on the bottom part of the micro-channels.
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