Porous Capillary Membrane for RCA Product Quantification
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Solution Overview
Problem
Quantifying rolling-circle amplification (RCA) products in maternal blood samples is challenging due to low molar concentrations, leading to inefficiencies in detection methods that rely on diffusion onto glass slides, which are time-consuming and non-reproducible.
Innovation Solution
Using a porous capillary membrane to filter and concentrate RCA products, allowing for the distinction and quantification of labeled populations, thereby increasing precision, sensitivity, and reproducibility, and reducing background noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If labeled RCA products are deposited onto a glass slide and incubated for extended periods to allow diffusion and attachment, then the number of detected products increases, but the time required for the assay increases significantly
Solution Approach 1:
A porous support membrane is introduced as an intermediary between the liquid sample containing RCA products and the detection system. The membrane captures RCA products through filtration and concentration, enabling rapid detection without requiring extended diffusion and incubation periods on glass slides. This intermediary structure facilitates efficient product recovery while maintaining detection sensitivity.
2Measurement precision
If RCA products are allowed to diffuse onto a glass slide surface, then products can be counted, but background noise from unbound labeled molecules increases
Solution Approach 1:
The detection process is separated into two distinct stages: (1) filtration and concentration of RCA products on the porous membrane, and (2) washing to remove unbound labeled molecules, followed by detection. This extraction of the concentration step from the detection step allows for effective background reduction while maintaining product recovery efficiency.
3Reliability
If a large volume of liquid sample is used to ensure sufficient RCA products are present, then statistical robustness improves, but the complexity of handling and processing the sample increases
Solution Approach 1:
A porous support membrane with controlled pore structure is used to filter and concentrate RCA products from liquid samples. The porous structure enables efficient capture of RCA products while allowing liquid to pass through, facilitating simple processing of large sample volumes without requiring complex centrifugation or filtration apparatus. The membrane concentration effect provides statistical robustness while maintaining operational simplicity.
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 method enables fast, precise, and reproducible quantification of RCA products, significantly increasing the number of counted products within minutes, compared to hours, and improving accuracy in low-concentration samples, particularly in non-invasive prenatal testing.
Implementation Method 1
filtering a liquid sample containing rolling circle amplification (RCA) products using a porous capillary membrane
Data Source
AI summary
A method of sample analysis is provided. In certain embodiments, the method may comprise: (a) filtering a liquid sample containing rolling circle amplification (RCA) products using a porous capillary membrane, thereby producing an array of the RCA products on the membrane; wherein the sample contains at least a first population of RCA products and a second population of RCA products, wherein the first and second populations of labeled RCA products are distinguishably labeled; and (b) determining the amount of the first labeled population of RCA products and the amount of the second labeled population of RCA products in an area of the membrane.