Homogeneous Assay Surface Amplification Layer
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Solution Overview
Problem
Biological and chemical assays, such as diagnostic testing, require multiple steps of incubation and wash cycles, making them time-consuming and difficult to adapt to high throughput and automation, especially when measuring the volume, shape, or detecting analytes in samples.
Innovation Solution
The QMAX device with a surface amplification layer that enhances optical signals based on the label's distance from the surface, enabling pixelated reading, high detection sensitivity, and homogeneous assays without washing steps, allowing for rapid analysis of small sample volumes in minutes using a mobile device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple steps of incubation and wash cycles are used in a typical assay method, then detection accuracy is improved, but assay time increases significantly
Solution Approach 1:
The invention extracts and eliminates the wash cycles from the traditional multi-step assay protocol. By using a single-well format with a solid support structure, unbound reagents and analytes are removed through simple decanting or washing away, replacing complex multi-step wash cycles with a single rapid washing step that maintains detection accuracy while dramatically reducing assay time.
Solution Approach 2:
The assay is segmented into distinct functional zones within a single well: a solid support structure for capturing analytes, a detection zone for signal generation, and a clearance zone for removing unbound materials. This spatial segmentation allows simultaneous occurrence of binding events and simplifies the removal of excess reagents without requiring multiple sequential wash steps.
2Measurement precision
If traditional multi-step assay protocols are used, then detection sensitivity is improved, but device complexity and automation difficulty increase
Solution Approach 1:
The invention merges multiple assay functions into a single integrated well structure. The solid support, capture agents, detection reagents, and sample containment are all combined in one well, eliminating the need for multiple plates, tubes, or complex transfer steps. This merging maintains detection sensitivity while dramatically simplifying the protocol for automation.
Solution Approach 2:
The single-well format serves multiple functions simultaneously: it contains the sample, provides the solid support for analyte capture, holds detection reagents, and facilitates signal detection. This multi-functionality replaces multiple specialized components in traditional assays, reducing device complexity while maintaining or improving detection sensitivity through optimized reagent-analyte interactions.
3Measurement precision
If wash cycles are required in the assay, then signal-to-noise ratio is improved, but assay throughput and speed decrease
Solution Approach 1:
The solid support structure acts as an intermediary that physically separates bound analytes from unbound reagents. By anchoring capture agents to the solid support, the invention creates a natural barrier that allows simple decanting or single-step washing to achieve the same signal-to-noise separation that traditionally required multiple wash cycles, thereby maintaining signal quality while enabling high throughput.
4Reliability
If multiple incubation steps are performed, then binding specificity is improved, but total assay time increases
Solution Approach 1:
The invention enables continuous binding interactions within the single-well format. By maintaining all reagents and analytes in close proximity within one well without requiring transfer or multiple incubation cycles, the assay achieves equivalent or improved binding specificity through sustained molecular interactions, while reducing total incubation time by eliminating idle periods between steps.
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 reduces assay time to less than 60 seconds, enhances sensitivity to 50 fM, and enables non-professionals to perform assays with minimal equipment and steps, improving detection accuracy and efficiency.
Implementation Method 1
a surface amplification layer on the QMAX surface, where the surface amplification layer amplifies an optical signal of a label depending upon the label's distance from the surface amplification: high amplification when the label is on the amplification surface, but weak or no amplification at all when the label is a few microns away from the amplification surface
Data Source
AI summary
A homogeneous assay method that employs a device is provided. In some embodiments, the device contains a pair of plates that can be opened and closed. The sample is placed between two plates. In some embodiments, the thickness of the sample in a closed configuration, the concentration of labels, and amplification factor of the amplification surface are configured to make the label(s) bound on the amplification surface visible without washing away of the unbound labels.