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Direct quantification of analyte concentration by resonant acoustic profiling
Benjamin Godber1, Kevin S J Thompson, Marian Rehak
1Akubio Ltd., Cambridge, United Kingdom.
Clinical Chemistry
|August 6, 2005
Summary
Resonant Acoustic Profiling offers a label-free method to detect analytes like proteins and cofactors quickly. This technology enables sensitive, real-time diagnostics with potential in clinical chemistry and in vitro diagnostics.
Area of Science:
- Biotechnology
- Biosensing
- Analytical Chemistry
Background:
- Acoustic sensors utilizing resonating quartz crystals detect analyte-receptor binding.
- Applications span detection of pathogens, nucleic acids, and biomarkers such as myoglobin and IL-1beta.
Purpose of the Study:
- To develop and validate a label-free biosensing method using Resonant Acoustic Profiling.
- To assess the platform's capability for quantifying protein and cofactor concentrations.
Main Methods:
- Resonant Acoustic Profiling integrated with a microfluidic lateral flow device.
- Utilized immobilized receptors on a disposable sensor chip with stable linker chemistry and an internal reference control.
- Analyte concentration determined by measuring the binding rate to specific receptors.
Main Results:
- Successfully determined specificity and affinity of antibody-antigen and enzyme-cofactor interactions without labeling.
- Quantified concentrations of interleukin-1beta (IL-1beta) and myoglobin at lower detection limits of approximately 1 nmol/L.
- Measured the binding constant for NADP+ and glucose dehydrogenase.
Conclusions:
- Resonant Acoustic Profiling provides a rapid (<10 min), label-free assay for analyte detection.
- Potential for real-time immunoassays and biomarker detection.
- Platform suitable for reagent validation and future in vitro diagnostics.