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Updated: Feb 3, 2026

Label-free Single Molecule Detection Using Microtoroid Optical Resonators
Published on: December 29, 2015
Label-free optical detection of cyclosporine in biological fluids
Marcin Marzejon1, Monika Kosowska1, Daria Majchrowicz1
1Faculty of Electronics, Telecommunications and Informatics, Department of Metrology and Optoelectronics, Gdańsk University of Technology, Gdańsk, Poland.
Abstract:
In this paper, a spectroscopic method for determination of cyclosporine concentrations in biological fluids is presented. Blood plasma and hemoglobin solutions are chosen for the experiment. For various cyclosporine concentrations in blood plasma and hemoglobin, absorbance measurements in spectra range from 600 to 1100 nm are performed. The measurement results are analyzed by the use of a dedicated algorithm. The obtained data are characterized by a high coefficient of correlation R2 , which is equal to 0.9461 and 0.9808 for blood plasma and hemoglobin, respectively. The proposed method enables the selective detection of cyclosporine level and could be applied in medicine and laboratory diagnostics. The obtained result can be the base to build the point-of-care CsA level detection optical sensor.
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