SPR Sensor Surface Chemistry for Low-Noise Signal Amplification
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Solution Overview
Problem
Current SPR and LSPR technologies suffer from non-specific binding signal noise and sensitivity issues, particularly with low molecular weight analytes, leading to low signal-to-noise ratios.
Innovation Solution
The use of novel linker molecules with customizable anchor sites, spacer groups, and ligand attachment sites on a SPR or LSPR sensor, optimized for higher specificity and signal amplification, including polyelectrolyte-functionalized surfaces and gold layers with self-assembled monolayers of peptides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a self-assembled monolayer with hydrophobic alkane chain is used, then the sensor surface provides stable structure, but non-specific binding signal noise increases
Solution Approach 1:
The patent changes the chemical parameter of the surface layer from hydrophobic alkane chain to hydrophilic polymer brush, fundamentally altering the surface properties to reduce non-specific binding while maintaining structural stability
Solution Approach 2:
The patent creates a composite structure combining the stable metal surface with a hydrophilic polymer brush layer, achieving both structural stability and reduced non-specific binding through material composition optimization
2Ease of manufacture
If conventional SPR/LSPR methods are used for low molecular weight analytes, then the detection method is simple, but the signal is too low to be discernible above non-specific binding noise
Solution Approach 1:
The patent changes the surface chemistry parameters to create a hydrophilic environment that reduces non-specific binding noise, thereby improving the signal-to-noise ratio for low molecular weight analytes while keeping the detection method relatively simple
Solution Approach 2:
The hydrophilic polymer brush acts as an intermediary layer between the metal surface and the analyte, reducing non-specific binding interactions and enhancing the detectable signal for low molecular weight molecules
3Object-generated harmful factors
If elaborate methods are used to minimize non-specific binding, then non-specific binding is reduced, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-coating the sensor surface with a hydrophilic polymer brush before analyte introduction, which proactively prevents non-specific binding rather than requiring complex post-processing or correction methods
Solution Approach 2:
The hydrophilic polymer brush provides self-service by inherently resisting non-specific binding through its hydrophilic properties, eliminating the need for elaborate external methods to minimize non-specific binding
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
Enhances signal amplification and reduces noise, resulting in improved signal-to-noise ratios for detecting analytes such as proteins, antibodies, and nucleic acid molecules.
Implementation Method 1
Surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) spectroscopy are used for a variety of analytical methods
Implementation Method 2
the linker may include a self-assembled monolayer of peptides
Implementation Method 3
the anchor site or linker 'head' may include a sulfur containing chemical functional group which binds readily to the surface (e.g. a gold coated surface)
Data Source
AI summary
The present invention is directed to an improved surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) sensors, improved SPR and LSPR sensor surface chemistry, and methods and systems for improved detection of analytes in SPR and LSPR. Use of the SPR and LSPR sensors described herein improves signal amplification, and thus, provides for higher signal-to-noise, in detection of various analytes, such as proteins, antibodies, carbohydrates, and nucleic acid molecules.