Fluorescent Nanoparticle Detection Reducing Background Noise
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Solution Overview
Problem
Current immunohistological staining methods using high-luminance fluorescent labeling materials suffer from increased background noise and lack quantitativity, making it difficult to accurately detect specific biological substances like HER2 in breast cancer diagnosis.
Innovation Solution
The use of fluorescent substance-encapsulated nanoparticles as color formers, combined with nanoparticles encapsulating no fluorescent substance as a blocking agent to prevent non-specific adsorption, enhances the signal-to-noise ratio and accuracy of detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-luminance fluorescent labeling materials are used to improve detection sensitivity, then the signal intensity increases, but background noise increases and measurement precision deteriorates
Solution Approach 1:
The invention divides the fluorescent labeling system into two distinct components: fluorescent substance-encapsulated nanoparticles (signal-forming particles) and nanoparticles encapsulating no fluorescent substance (blocking particles). This segmentation allows the signal generation and noise suppression functions to be separated and optimized independently, resolving the contradiction between detection sensitivity and background noise.
Solution Approach 2:
The blocking particles act as an intermediary substance that mediates between the fluorescent signal and the background noise. By competing for non-specific binding sites, these particles suppress background noise without affecting the specific fluorescent signal, thereby improving measurement precision while maintaining detection sensitivity.
2Object-generated harmful factors
If conventional blocking agents are used to reduce non-specific adsorption, then background noise is reduced, but the blocking ability is insufficient compared to nanoparticles
Solution Approach 1:
The invention changes the physical parameter of the blocking agent from conventional small molecules or proteins to nanoparticles. This size parameter change provides two advantages: (1) nanoparticles have larger surface area for blocking non-specific sites, and (2) their size is comparable to the target structures, enabling more effective steric blocking. This parameter change significantly enhances blocking ability and reliability.
3Measurement precision
If fluorescent dyes or semiconductor nanoparticles are incorporated to increase fluorescence quantity, then detection sensitivity improves, but non-specific bonding increases and background noise increases
Solution Approach 1:
The invention segments the fluorescent labeling function from the blocking function into two separate particle types. The fluorescent substance-encapsulated nanoparticles provide signal with controlled non-specific bonding, while the separate blocking particles specifically address the non-specific bonding issue. This segmentation resolves the contradiction by allowing each component to be optimized for its specific function.
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 allows for improved histologically stained images with enhanced diagnostic accuracy by reducing background noise and increasing the precision of HER2 detection in breast cancer diagnosis.
Implementation Method 1
fluorescent substance-encapsulated nanoparticles to whose particle surfaces biological substance-recognizing molecules have been bonded
Implementation Method 2
nanoparticles encapsulating no fluorescent substance are used as a blocking agent for preventing the fluorescent substance-encapsulated nanoparticles from being non-specifically adsorbed
Data Source
AI summary
A detection method for a specific biological substance uses, as a color former, fluorescent substance-encapsulated nanoparticles which have biological substance-recognizing molecules. The biological substance-recognizing molecules specifically recognize a specific biological substance. The biological substance-recognizing molecules are bonded to the surface of the nanoparticles. Nanoparticles encapsulating no fluorescent substance are used as a blocking agent for preventing the fluorescent substance-encapsulated nanoparticles from being non-specifically adsorbed on a biological substance other than the specific biological substance.