QMAX Card Assay for Rapid Vitamin D Detection
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Solution Overview
Problem
Traditional Vitamin D assays are complex, time-consuming, and require large sample volumes, making them laborious and difficult to perform outside of lab settings, especially for quickly measuring 25-hydroxy-vitamin D levels.
Innovation Solution
A device and method using nanoparticle labels and a QMAX card with movable plates to reduce binding time, allowing for rapid detection of Vitamin D by compressing samples into thin layers for accelerated binding and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional Vitamin D assays are used, then measurement accuracy is maintained, but assay time is extended to 30 minutes to hours and sample volume required is increased to >20 uL
Solution Approach 1:
The device employs movable plates that can transition between open and closed configurations. When closed, the plates compress the sample into a thin layer (thickness reduced to micrometer scale), dynamically changing the sample geometry to accelerate binding. This dynamic compression reduces the diffusion distance for nanoparticles to reach binding agents, cutting binding time from hours to minutes while maintaining measurement accuracy.
Solution Approach 2:
The invention changes the physical parameters of the sample by compressing it into a thin layer between plates, reducing thickness from millimeter to micrometer scale. This parameter change increases the surface area to volume ratio and reduces diffusion paths, thereby accelerating the binding kinetics without compromising the binding affinity or measurement precision.
2Ease of operation
If traditional Vitamin D assays are used, then reliable detection is achieved, but device complexity and operational difficulty are increased requiring lab setups and professional operation
Solution Approach 1:
The device is designed as a self-contained system where the movable plates automatically compress the sample when closed, eliminating the need for external compression devices or complex lab equipment. The assay protocol is simplified to basic steps (add sample, close plates, read result), making it operable by non-professionals without requiring laboratory training or specialized knowledge.
Solution Approach 2:
The device integrates multiple functions into a single platform: sample containment, compression, binding reaction, and detection all occur within the same device. This multi-functionality eliminates the need for separate lab equipment for each step, reducing both device complexity and operational difficulty while maintaining reliable detection capabilities.
3Quantity of substance
If traditional Vitamin D assays are used, then accurate measurement is achieved, but sample volume required is increased to >20 uL and pre-treatment steps are added
Solution Approach 1:
The dynamic compression of the sample into a thin layer concentrates the analyte and binding agents in a reduced volume, enabling accurate measurement with smaller sample volumes (<20 uL). The compression effectively increases the local concentration without requiring additional sample preparation steps, eliminating the need for complex pre-treatment protocols.
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
Enables quick and simple measurement of 25OH Vitamin D levels with reduced sample volume, suitable for non-professional use, significantly decreasing assay time to minutes or less than 60 seconds.
Implementation Method 1
the nanoparticle label is configured to bind to other binding entities (e.g. target analyte and binding agent) and provide a detectable signal that is related to the binding
Implementation Method 2
A device and method using nanoparticle labels and a QMAX card with movable plates to reduce binding time, allowing for rapid detection of Vitamin D by compressing samples into thin layers for accelerated binding and analysis
Data Source
AI summary
The present invention provides, among other things, QMAX card based assays in different forms for various analytes, offering simpler, fast, more sensitive assaying.