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Label-Free Protein Detection by Micro-Acoustic Biosensor Coupled with Electrical Field Sorting. Theoretical Study in
Nikolay Mukhin1,2, Georgii Konoplev3, Aleksandr Oseev4
1Institute for Micro and Sensor Systems, Otto-von-Guericke-University Magdeburg, 39106 Magdeburg, Germany.
Sensors (Basel, Switzerland)
|April 30, 2021
Summary
This study introduces a novel microfluidic sensor for point-of-care urinalysis, enabling selective detection of different proteins and their forms. The technology uses electric fields to manipulate protein concentration, improving diagnostic accuracy for various conditions.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Microfluidics
Background:
- Point-of-care (POC) urinalysis is crucial for diagnosing various pathological conditions.
- Current laboratory-based assays face limitations in speed and accessibility.
- Selective detection of urine proteins, including different oligomeric forms, is a significant challenge.
Purpose of the Study:
- To develop a novel microfluidic sensor for selective protein detection in urinalysis.
- To address the challenge of distinguishing proteins with similar biochemical properties but different physical characteristics, such as oligomeric forms of uromodulin.
- To enhance the sensitivity and accuracy of POC urine analysis.
Main Methods:
- Utilizing a shear bulk acoustic resonator sensor with an additional electrode for electric field manipulation of proteins.
- Modulating protein concentration in the near-surface region of the sensor to exploit differences in diffusion coefficients and zeta-potentials.
- Employing a structured sensor interface to improve sensitivity to density variations.
Main Results:
- Numerical studies demonstrated the feasibility of selectively detecting albumin, immunoglobulin, and oligomeric forms of uromodulin in model urine solutions.
- The proposed method allows differentiation of proteins based on their physical properties, overcoming limitations of biochemical affinity.
- The approach shows potential for enhanced sensitivity and specificity in urinalysis.
Conclusions:
- The proposed shear bulk acoustic resonator sensor with electric field manipulation offers a promising approach for advanced POC urinalysis.
- This technology can enable the selective detection of various urine proteins and their specific forms, improving diagnostic capabilities.
- Further development could lead to more accurate and accessible diagnostic devices for a range of kidney and urinary tract conditions.
