Electrochemical Microarray Chip for DNA Detection
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Solution Overview
Problem
Current methods for detecting specific binding of single-stranded DNA (ssDNA) and single-stranded RNA (ssRNA) molecules to microarrays lack efficient regulation of binding kinetics and sensitivity, particularly in measuring low concentrations of target sequences.
Innovation Solution
A chip with multiple electrodes and microspots of immobilized probe molecules, utilizing oscillatory potentials and redox ions to enhance and regulate probe-target binding, allowing for differential reflectivity measurements to estimate target concentrations as low as 0.1 femtomolar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used for probe-target binding, then the detection can be performed with simple equipment, but the sensitivity is insufficient for measuring low concentrations of target sequences
Solution Approach 1:
The patent applies parameter changes by utilizing oscillatory potentials of varying frequencies and amplitudes to regulate binding kinetics. By dynamically adjusting electrical parameters (potential amplitude, frequency, waveform) during the binding process, the system enhances sensitivity for low-concentration targets while maintaining manageable device complexity through a relatively simple electrochemical setup.
2Productivity
If binding kinetics are not regulated, then the detection process is simpler, but the binding efficiency and detection accuracy are reduced
Solution Approach 1:
The patent employs periodic action through oscillatory potentials applied to the electrode. The binding process utilizes periodic voltage variations at specific frequencies (e.g., 1-1000 Hz) to enhance mass transport of target molecules to the electrode surface and regulate binding kinetics. This periodic electrical stimulation improves binding efficiency without requiring complex mechanical or chemical control systems.
Solution Approach 2:
The system applies dynamics by transitioning from static potential application to dynamic oscillatory potential control. The potential parameters (amplitude, frequency, waveform) are dynamically adjusted during different stages of the binding process to optimize kinetics at each phase, enabling efficient binding regulation through relatively simple electrochemical control.
3Measurement precision
If high concentrations of target molecules are measured, then the signal strength is sufficient, but the method cannot detect low concentrations as low as 0.1 femtomolar
Solution Approach 1:
The patent applies the principle of mechanical vibration analogously through electrical oscillation. The oscillatory potential creates periodic electrical fields that enhance the mass transport and interaction frequency between target molecules and probes, effectively amplifying the signal from low-concentration targets. This enables detection limits as low as 0.1 fM by increasing the effective collision rate without physically vibrating the system.
Solution Approach 2:
The patent uses redox ions as intermediaries to enhance signal generation. These ions mediate electron transfer reactions that produce amplified electrochemical signals proportional to the target concentration. The intermediary redox species enable sensitive detection of low-concentration targets by converting weak binding events into measurable electrical signals through catalytic or stoichiometric electron transfer processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively regulates binding kinetics, enabling sensitive detection of multiple target sequences with high specificity and sensitivity, allowing for accurate quantification of target concentrations across a wide dynamic range without the need for amplification or fragmentation.
Implementation Method 1
a redox ion is dissolved in the solution where some of the said ions oxidize at the electrode surface
Implementation Method 2
binding the target molecule in the solution to the immobilized probe using oscillatory potential, E′, applied between the electrode and the solution
Implementation Method 3
scanning a laser beam to measure differential reflectivity due to a fast AC potential
Data Source
AI summary
An electrochemical microarray chip to detect specific sequences of single-stranded DNA (ssDNA) or single-stranded RNA (ssRNA) target molecules in solution using a microarray of microspots of probe molecules immobilized on an electrode. The chip pertains to both regulating the immunospecific binding to the array of probes on the electrode and their subsequent detection on the microarray spots on the monolith electrode by electrochemical methods. The device can quantitatively measure the concentration of target molecules of specific sequence at high specificity and high sensitivity.