Biosensor Magnetic Nanoparticle Washing Background Interference
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Solution Overview
Problem
Point-of-care biosensors face challenges in maintaining detection accuracy and sensitivity due to background interference, as they rely on capillary forces without external forces for sample movement and reaction, making it difficult to remove unnecessary reactants effectively.
Innovation Solution
A biosensor design incorporating a magnetic nanoparticle complex with a reaction part and electrodes, where the magnetic nanoparticle complex includes a capturing substance and a reaction substance capable of oxidation or reduction reactions, and a control unit applies voltage steps to stabilize the detection signal and wash out background interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If capillary force is used for sample movement and reaction, then device complexity is reduced, but background interference increases and detection accuracy degrades
Solution Approach 1:
The patent applies dynamics by making the magnetic nanoparticle complex movable through external magnetic field control. The magnetic nanoparticle complex can be dynamically positioned between the reaction part and the electrode, allowing it to move to the reaction part for detection and then to the electrode for signal measurement, enabling washing steps without adding complex mechanical structures
Solution Approach 2:
The patent replaces mechanical washing structures with magnetic field-based control. Instead of using mechanical pumps or valves to wash the reaction part, an external magnetic field is applied to move the magnetic nanoparticle complex, which carries unnecessary reactants away from the reaction part, achieving washing function without mechanical complexity
2Measurement precision
If magnetic nanoparticle complex is used for capturing target substance, then detection sensitivity is improved, but background interference from unnecessary reactants increases
Solution Approach 1:
The magnetic nanoparticle complex is made dynamically movable through magnetic field control, allowing it to be positioned at the reaction part for capturing target substances and then moved to the electrode for signal measurement. This dynamic positioning enables selective interaction with the sample while separating from the electrode during washing, reducing background interference
Solution Approach 2:
The magnetic nanoparticle complex acts as an intermediary carrier that brings capturing substances to the reaction part and facilitates target substance capture. It can be selectively moved by magnetic field to the electrode for signal transduction, separating the capturing function from the detection function and reducing background interference
3Difficulty of detecting and measuring
If voltage is applied to detect current changes, then detection capability is enabled, but signal stability is poor due to background noise
Solution Approach 1:
The patent applies preliminary action by moving the magnetic nanoparticle complex to the electrode before applying detection voltage. This preliminary positioning ensures that the capturing substances are in place to generate stable signals, and the complex can be subsequently moved away during washing, allowing for stable signal measurement free from background noise
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 design enhances detection sensitivity by stabilizing the signal and improving accuracy by effectively removing background interference through controlled environmental changes in the reaction part.
Implementation Method 1
the magnetic nanoparticle complex is magnetic in the reaction part, and has a property that mobility can be changed according to a change in a condition of the reaction part
Implementation Method 2
a reaction substance that performs at least one of an oxidation reaction and a reduction reaction
Implementation Method 3
a reaction substance that performs at least one of an oxidation reaction and a reduction reaction
Implementation Method 4
a first capturing substance for capturing a first target substance
Data Source
AI summary
A biosensor includes a reaction part including a magnetic nanoparticle complex, a first electrode, and a second electrode; and a sample introduction part forming a passage so that a sample can be introduced into the reaction part from an outside of the biosensor. The magnetic nanoparticle complex includes a first capturing substance for capturing a first target substance, a magnetic nanoparticle, and a reaction substance that performs at least one of an oxidation reaction and a reduction reaction.