High Capacity Solid Phase Biomolecule Coating
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Solution Overview
Problem
Current solid phase bioaffinity assays face challenges in achieving high binding capacity and stability, with existing coatings often resulting in low activity and instability, particularly when using unmodified proteins or native streptavidin on solid supports.
Innovation Solution
A high capacity solid phase is created by coating a solid support with an analyte-specific biomolecule containing an SH-group in the presence of a zwitterionic additive, followed by incubation and drying, which significantly enhances binding properties and stability, allowing for up to 100-fold improvement in biotin binding capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unmodified protein is adsorbed onto solid support, then coating process is simple, but binding capacity is low
Solution Approach 1:
The patent modifies the protein structure by introducing SH-groups through chemical conjugation with agents like glutaraldehyde or succinimidyl esters. This parameter change in protein chemistry enables significantly improved binding capacity (up to 100-fold) while maintaining a relatively simple coating process. The modified protein then binds to the solid support through the introduced functional groups rather than passive adsorption.
Solution Approach 2:
The invention creates a composite system by conjugating protein molecules with crosslinking agents or functionalizing groups (SH-groups) before adsorption. This composite modification allows the protein to achieve both stable attachment to the solid support and high binding capacity, resolving the contradiction between simple coating and high binding capacity.
2Ease of manufacture
If native streptavidin is used on solid support, then coating is straightforward, but stability is poor
Solution Approach 1:
The patent chemically modifies native streptavidin by introducing SH-groups through conjugation with crosslinking agents. This parameter change in the protein's chemical structure dramatically improves stability by reducing protein leakage and enhancing resistance to denaturation, while the coating process remains relatively straightforward using standard adsorption protocols.
Solution Approach 2:
The invention uses crosslinking agents or functionalizing agents as intermediaries that modify the streptavidin protein structure. These intermediaries (such as glutaraldehyde or succinimidyl esters) create stable chemical bonds between the streptavidin and the solid support, thereby improving stability without complicating the overall coating process.
3Quantity of substance
If thiolated streptavidin is coated, then binding capacity improves, but spot morphology consistency deteriorates
Solution Approach 1:
The patent optimizes the coating parameters by controlling the concentration of thiolated streptavidin, the type and amount of crosslinking agent used, and the coating conditions (pH, temperature, incubation time). These parameter changes enable achieving both high binding capacity and consistent spot morphology. For example, using controlled amounts of crosslinking agents like glutaraldehyde or succinimidyl esters maintains spot uniformity while enhancing binding properties.
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
The method provides a high-density solid phase with enhanced adsorption properties and improved spot morphology, ensuring high-capacity binding while maintaining stability, suitable for applications like microarrays and biosensors.
Implementation Method 1
coating a solid support with an analyte-specific biomolecule containing an SH-group in the presence of a zwitterionic additive
Data Source
AI summary
A high capacity solid phase for bioaffinity assays and other solid phase applications prepared by coating a solid support with an analyte-specific biomolecule in the presence of a zwitterionic additive is described. Structures prepared according to the invention provide high capacity solid phases with enhanced binding properties, which are advantageous for any solid phase based assay.