Biosensor Array Using Electrical Signature Beads for Multi-Analyte Detection
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Solution Overview
Problem
Current biosensor technologies face challenges in efficiently detecting multiple analytes simultaneously due to the complexity of functionalizing small sensing electrodes and the weakness of single molecule detection signals, which requires precise spotting techniques and long acquisition times.
Innovation Solution
A method involving a random distribution of biomolecule receptor molecules on sensing electrodes, using beads with distinct electrical signatures to detect analytes without prior knowledge of receptor location, allowing for simultaneous detection of multiple analytes through changes in electrical signatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precise spotting techniques are used to functionalize sensing electrodes, then manufacturing precision is improved, but device complexity and acquisition time increase
Solution Approach 1:
The sensing electrodes perform self-identification through their inherent electrical signatures, eliminating the need for external spotting techniques. The system automatically identifies which electrodes contain which receptor molecules based on their electrical characteristics, making the functionalization process self-sufficient and simplifying the overall device complexity.
Solution Approach 2:
The mechanical spotting process is replaced by an electrical identification system. Instead of physically placing receptor molecules on specific electrodes using spotting techniques, the system uses electrical signatures to identify and associate receptor molecules with their respective electrodes automatically, reducing mechanical complexity.
2Measurement precision
If single molecule detection is attempted, then measurement precision is improved, but signal strength becomes too weak for reliable detection
Solution Approach 1:
An intermediary amplification mechanism is introduced between the single molecule binding event and the detection signal. The system uses electrical signature changes as an intermediary that amplifies the weak single-molecule events into measurable signals, allowing precise detection without requiring extremely strong individual signals.
Solution Approach 2:
The detection approach changes from measuring direct signal strength to measuring electrical parameter changes (electrical signatures). By detecting changes in electrical characteristics rather than relying on signal amplitude, the system can detect single molecule events that would otherwise be too weak to measure directly.
3Productivity
If multiple analytes are detected simultaneously, then productivity is improved, but device complexity increases due to need for precise receptor placement
Solution Approach 1:
Each sensing electrode in the array performs self-identification through its unique electrical signature, allowing the system to automatically determine which electrode contains which receptor molecule. This self-identification enables simultaneous detection of multiple analytes without requiring complex external functionalization processes or precise manual placement techniques.
Solution Approach 2:
The sensing electrode array serves multiple functions simultaneously: it detects multiple analytes, identifies its own functionalization state through electrical signatures, and performs self-characterization. This multi-functionality eliminates the need for separate precise spotting processes for each analyte, reducing overall device complexity while maintaining high productivity.
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
This approach simplifies the functionalization process, reduces detection time, and enhances signal strength by eliminating the need for precise spotting and enabling parallel detection of multiple analytes on small-scale biosensor arrays.
Implementation Method 1
a first sensing electrode comprising at its surface a first receptor for selectively binding to a first analyte of interest and a second sensing electrode comprising at its surface a second receptor for selectively binding to a second analyte of interest
Implementation Method 2
using beads with distinct electrical signatures to detect analytes without prior knowledge of receptor location, allowing for simultaneous detection of multiple analytes through changes in electrical signatures
Implementation Method 3
a capture molecule forms an insulating layer of a capacitor, with the plates or sensing electrodes of the capacitor formed by a conductive sensing surface and a fluid sample respectively
Implementation Method 4
A capture event causes a change in the dielectric constant of the insulating layer including the volume directly above the sensor surface in which a capture event takes place, which affects the capacity of the capacitor
Implementation Method 5
When such hybridization or sensor events occur at the sensor surface, this may change the electrical properties of the surface and the volume directly above the surface which can be detected as the sensor event
Data Source
AI summary
A method for providing an integrated circuit such that first and second sensing electrodes respectively have at their surfaces first and second receptor molecules for selectively binding to first and second analytes of interest; exposing the integrated circuit to a sample potentially comprising at least one of the first and second analytes, providing a first bead having a first electrical signature attached to a first molecule having a conformation/affinity for binding to the first sensing electrode dependent on the presence of the first analyte; providing a second bead having a second electrical signature attached to a second molecule having a conformation/affinity for binding to the second sensing electrode dependent on the presence of the second analyte; and determining the presence of the electrical signature of the first and/or second bead(s) on the first and second sensing electrodes respectively. An IC for implementing this method.