Cyclooctyne-Silatrane Anchors for Aqueous AFM Tip Functionalization
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Solution Overview
Problem
Current methods for attaching affinity molecules to AFM tips are complex, moisture-sensitive, and difficult to operate in aqueous solutions, limiting their use in biological laboratories for detecting low-abundance disease-relevant protein biomarkers.
Innovation Solution
Development of chemical reagents that enable easy attachment of affinity molecules to AFM tips using cyclooctyne-silatrane molecular anchors and orthogonal click reactions, allowing for high-yield attachment in aqueous solutions, specifically using copper-free alkyne-azide cycloaddition and thiol-vinylsulfone Michael addition reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional attachment chemistry using APTES and NHS ester is used, then affinity molecules can be attached to AFM tips, but the process becomes complex and moisture-sensitive requiring multiple reaction steps and organic solvents
Solution Approach 1:
The patent changes the chemical parameters of the attachment reaction by using silane chemistry that proceeds in aqueous solutions without moisture sensitivity. The silane reagent forms stable covalent bonds with the silicon oxide surface through siloxane bond formation, eliminating the need for moisture-sensitive NHS ester chemistry and multiple reaction steps.
Solution Approach 2:
The patent extracts and removes the problematic moisture-sensitive steps from the attachment process. By using silane-based chemistry, the method eliminates the need for APTES activation and NHS ester coupling steps, leaving only the essential silane surface modification step that proceeds readily in aqueous conditions.
2Ease of manufacture
If traditional attachment chemistry is used, then affinity molecules can be attached to AFM tips, but the process requires multiple reaction steps and moisture-sensitive chemicals
Solution Approach 1:
The patent merges multiple separate reaction steps into a single integrated silane attachment process. The silane reagent simultaneously provides surface binding functionality and affinity molecule coupling capability in one step, eliminating the need for separate APTES treatment, NHS ester activation, and coupling steps that were required in traditional methods.
3Adaptability or versatility
If traditional attachment chemistry using organic solvents is used, then affinity molecules can be attached to AFM tips, but the process becomes difficult to operate in aqueous solutions
Solution Approach 1:
The patent changes the solvent parameter from organic to aqueous by using silane chemistry that is inherently compatible with water. The silane reagent hydrolyzes and condenses on the silicon oxide surface in aqueous solutions, providing a straightforward protocol that can be operated in biologically relevant aqueous environments without requiring organic solvents.
4Measurement precision
If current attachment methods are used, then affinity molecules can be attached to AFM tips, but the detection sensitivity for low-abundance proteins is limited
Solution Approach 1:
The patent replaces the complex multi-step chemical attachment mechanism with a simpler silane-based attachment mechanism that provides more reliable and consistent attachment. This substitution leads to better control over the number and orientation of affinity molecules on the AFM tip, thereby improving detection sensitivity for low-abundance proteins.
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
Facilitates sensitive and specific detection of disease-relevant proteins by forming uniform monolayers on AFM tips, enabling robust biological assays without the need for organic solvents, thus enhancing the capability to detect proteins at low concentrations.
Implementation Method 1
a molecular anchor that was synthesized by coupling cyclooctyne to silatrane for introduction of a chemically reactive function to AFM tips
Implementation Method 2
copper free alkyne-azide cycloaddition
Implementation Method 3
thiol-vinylsulfone Michael addition
Data Source
AI summary
Chemical linkage reagents, methods of making and method of using the same are provided. Chemical linkage reagents according to at least some of the embodiments of the present disclosure may be incorporated into or operatively-linked with affinity molecules for attachment to silicon oxide surfaces to, for example, measure interactions between an affinity molecule and its targeting biomolecules.