Test Strip Analyte Transfer Reagent for Drug Detection
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Solution Overview
Problem
Current rapid drug tests face challenges in sensitivity, specificity, and ease of use, particularly in detecting drugs from small sample volumes and requiring complex handling or expensive equipment, leading to unreliable results and high false-positive rates.
Innovation Solution
A method involving a test element with specific regions for sample application, binding partners, and optical detection, combined with an analyte transfer reagent, allows direct contact between the analyte and binding partner for enhanced sensitivity and specificity, reducing sample volume requirements and eliminating the need for additional technical aids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chromatography is started by immersing the test strip in an aqueous solution, then the analyte can be detected by antibodies bound to drug molecules forming a colored line, but the sample volume required is large and the handling is complex
Solution Approach 1:
The test strip is pre-soaked with binding partners (antibodies) before use, and the sampling element is pre-wetted with buffer solution. This preliminary preparation eliminates the need for complex handling during the test, as users simply need to bring the sampling element into contact with the test strip. The binding partners are already in optimal positions to capture analytes immediately upon contact.
Solution Approach 2:
The sampling element is integrated within or combined with the test strip structure, forming a compact nested design. The sampling element can be a swab, cotton tip, or porous material housed within the test strip body, allowing the entire device to be held and operated as a single unit, significantly simplifying handling compared to separate components.
2Measurement precision
If direct contact between analyte and binding partner is achieved before chromatography, then sensitivity and specificity are enhanced, but the test format becomes more complex
Solution Approach 1:
The sampling element contact region and the chromatography start region are merged into a single integrated zone on the test strip. When the sampling element is pressed against the test strip, the buffer-wetted sampling element directly contacts the binding partners immobilized on the test strip, enabling immediate analyte-binding complex formation. This merged design achieves direct contact without requiring separate incubation chambers or complex multi-step procedures.
Solution Approach 2:
A buffer solution is used as an intermediary medium that facilitates direct contact between the analyte and binding partner. The sampling element is pre-wetted with buffer, which acts as a mediator to enable the analyte to diffuse directly from the sampling element onto the test strip and bind to the binding partners, eliminating the need for complex washing or transfer steps.
3Measurement precision
If multiple binding partners are used to detect different drugs, then specificity increases, but false-positive rates increase due to cross-reactivity
Solution Approach 1:
Different binding partners (antibodies specific to different drugs) are immobilized at distinct, spatially separated locations on the test strip. Each binding partner is positioned in its own localized region, ensuring that analytes bind only to their specific counterparts. This spatial segregation prevents cross-reactivity between different drug analytes and their respective binding partners, eliminating false positives while maintaining high specificity for multiple drug detections.
4Speed
If the test strip is pre-soaked with binding partners, then the analyte can be captured immediately upon contact, but the storage conditions become more stringent
Solution Approach 1:
The binding partners are immobilized on a solid support (test strip or sampling element) rather than remaining in solution. This parameter change from liquid to solid phase dramatically improves storage stability, as immobilized antibodies are less susceptible to degradation, aggregation, or loss of activity during storage. The solid support provides a stable matrix that protects the binding partners while still allowing rapid analyte binding when the test is performed.
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 achieves high sensitivity and specificity for drug detection with minimal sample volume, providing reliable results without complex equipment, and is suitable for field use.
Implementation Method 1
promotes transfer of the analyte from a wiping element to the test element and/or promotes release of the analyte from the wiping element
Implementation Method 2
the analyte and an analyte-specific binding partner are incubated so that a complex of the analyte and the analyte-specific binding partner is formed
Implementation Method 3
bringing the first region of the incubated test element into contact with an eluent, and determining the presence and/or the amount of the analyte
Data Source
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AI summary
The present invention relates to a method for determining analytes as well as a device which is suitable herefor, comprising: (a) a test element (for example a test strip), comprising (i) a first zone which is designed to take up eluent, (ii) a second zone which is designed for the application of a sample containing the analyte and which comprises a binding partner with specificity for the analyte, (iii) a third zone which is designed for the optical detection of the analyte, (iv) a fourth zone which is designed for taking up excess eluent, and (v) optionally a housing, and (b) a wiping element which is designed to take up a sample of the analyte, where the test element and/or the wiping element comprises an analyte transfer reagent which contains at least one analyte-unspecific substance selected from the group consisting of a protein, a protein mixture, a carbohydrate and a sugar alcohol. KEY: FIG. 2: Markierte Analyt-Bindepartner Labelled analyte binding partner Testlinie Test line Kontrolllinie Control line