Immunoassay Sensitivity via High Salt Buffer Conditions
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Solution Overview
Problem
Current diagnostic assays for immunosuppressant drugs like tacrolimus and cyclosporine face challenges in accurately measuring blood concentration levels, leading to insufficient or excessive drug levels, which can result in graft rejection or toxic side effects.
Innovation Solution
The method involves contacting a test sample with an antibody specific to the immunosuppressant drug under high salt conditions, typically above 0.4 M, to enhance assay sensitivity, using a salt concentration of up to 4.0 M, often with a monovalent anion like chloride, and including glycols and alcohols in the assay mixture to improve drug-antibody interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional diagnostic assays are used for immunosuppressant drugs, then the assay can be performed with standard conditions, but the sensitivity and accuracy of drug level detection is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the salt concentration parameter in the assay buffer from conventional low salt conditions to high salt conditions (greater than 0.4 M, preferably greater than 1.0 M). This parameter change enhances the binding affinity between the antibody and the immunosuppressant drug, thereby improving assay sensitivity and accuracy without requiring complex additional equipment or procedures.
2Measurement precision
If high salt conditions are used to enhance assay sensitivity, then detection accuracy improves, but the complexity of assay conditions increases
Solution Approach 1:
The invention modifies the salt concentration parameter in the assay buffer to high salt conditions (greater than 0.4 M), which enhances the binding affinity between the antibody and immunosuppressant drug, thereby improving measurement precision. This parameter change is implemented straightforwardly by adjusting buffer composition, maintaining ease of operation while achieving improved precision.
3Measurement precision
If standard antibody binding conditions are used, then the assay procedure remains simple, but non-specific binding occurs reducing measurement accuracy
Solution Approach 1:
The patent changes the salt concentration parameter from standard to high salt conditions (greater than 0.4 M), which reduces non-specific binding between the antibody and other substances in the sample. This parameter change enhances the specificity of drug-antibody binding by strengthening the interaction between the antibody and its target drug, thereby improving measurement precision without requiring complex additional buffer components.
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 significantly enhances the sensitivity of the immunoassay, allowing for more accurate detection of immunosuppressant drug levels, reducing non-specific binding, and improving the precision of drug concentration measurements.
Implementation Method 1
contacting a test sample or test sample extract with an antibody specific for an immunosuppressant drug under conditions suitable for binding of the antibody to the immunosuppressant drug, if present, to form an assay mixture. Such conditions include a salt concentration of greater than about 0.4 M
Implementation Method 2
The assay mixture can additionally includes a glycol, such as ethylene glycol, propylene glycol, or an analog thereof, and at least one alcohol having five or fewer carbons
Data Source
AI summary
The invention provides immunoassays for immunosuppressant drugs, wherein the assay is carried out under high salt conditions to achieve improved sensitivity. The invention also provides kits that are useful for performing the methods of the invention.