Label-Free Biomolecule Detection via Metal Complex Aggregation
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Solution Overview
Problem
Current methods for detecting and characterizing biomolecules with multiple charges are often expensive, technically complex, and require labeling, making them time-consuming and unsuitable for efficient biomedical research and clinical diagnosis.
Innovation Solution
A label-free assay method using charged d8 or d10 metal complexes that bind to biomolecules via electrostatic interactions, inducing aggregation and self-assembly, which results in observable changes in UV/vis, emission, and CD intensities, allowing for the detection and characterization of multiple-charged biomolecules without the need for labeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If labeling methods are used for biomolecule detection, then detection sensitivity is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts and eliminates the labeling step from the detection process. By using label-free optical sensing based on surface plasmon resonance, the method removes the need for fluorescent or radioactive labels while maintaining detection capability through direct measurement of biomolecule binding events.
Solution Approach 2:
The invention introduces a specific binding protein as an intermediary between the target biomolecule and the detection system. This binding protein immobilized on the sensor surface enables specific recognition and binding of the target, providing detection sensitivity without requiring labels on the target molecule itself.
2Measurement precision
If sophisticated analytical techniques are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The invention replaces complex mechanical and chemical manipulation systems with an optical detection system. Instead of using sophisticated analytical instrumentation for separation and detection, the method uses surface plasmon resonance to directly monitor binding events in real-time, simplifying the operational workflow while maintaining characterization accuracy.
3Reliability
If labeling procedures are implemented, then detection reliability is improved, but loss of time increases
Solution Approach 1:
The invention performs preliminary immobilization of the binding protein on the sensor surface before sample introduction. This pre-prepared sensor surface enables immediate detection upon sample addition, eliminating the time required for labeling procedures while maintaining detection reliability through the established binding interaction.
Solution Approach 2:
The invention enables continuous real-time monitoring of binding events without interruption for labeling steps. The optical detection system continuously measures changes in the sensor surface as biomolecules bind, providing uninterrupted data collection that reduces total assay time while maintaining reliable detection through continuous observation.
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 method provides a cost-effective and straightforward means to detect and characterize multiple-charged biomolecules, enabling the study of their secondary structure and conformation changes, facilitating biomedical research and clinical diagnostics.
Implementation Method 1
Electrostatic binding of the charged metal complex to the oppositely charged biomolecule induces aggregation and self-assembly of the metal complex
Implementation Method 2
aggregation and self-assembly of the metal complex via metal-metal interactions and/or π-π stacking interactions of a corresponding coordinating ligand
Implementation Method 3
aggregation and self-assembly of the metal complex via metal-metal interactions and/or π-π stacking interactions of a corresponding coordinating ligand
Implementation Method 4
creates remarkable optical property changes, such as UV/vis, emission, and CD intensity changes
Implementation Method 5
creates remarkable optical property changes, such as UV/vis, emission, and CD intensity changes
Implementation Method 6
creates remarkable optical property changes, such as UV/vis, emission, and CD intensity changes
Data Source
AI summary
The present invention provides a composition for detecting and/or characterizing a multiple-charged biomolecule comprising a charged d8 or d10 metal complex, wherein the metal complex electrostatically binds to the multiple-charged biomolecule to induce aggregation and self-assembly of the metal complex through metal . . . metal interactions, π . . . π interactions, or a combination of both interactions. The present invention further provides assay methods and kits for label-free optical detection and/or characterization of biomolecules carrying multiple charges, e.g., single-stranded nucleic acids, polyaspartate, polyglutamate, using a composition comprising a charged d8 or d10 metal complex.