Cotton-Based Nucleic Acid Extraction Eliminates Centrifugation
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Solution Overview
Problem
Existing nucleic acid extraction protocols, both silica and non-silica based, face challenges such as the presence of alcohol in eluted solutions which inhibit PCR, require high salt concentrations, and are not suitable for point-of-care (POC) use due to the need for centrifugation, which generates aerosols and is not efficient for processing small or large volumes of samples quickly.
Innovation Solution
A method and kit using cotton or its derivatives as a matrix for nucleic acid isolation, involving steps of lysis, binding, washing, and elution with specific buffers, allowing for efficient nucleic acid extraction without the need for centrifugation, alcohol washes, or high salt concentrations, and enabling POC use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If silica-based protocols are used for nucleic acid extraction, then nucleic acid purification is achieved, but alcohol remains in the eluted solution which inhibits PCR
Solution Approach 1:
The patent extracts and removes alcohol from the elution step by replacing traditional ethanol-based elution buffers with alternative buffers that do not contain alcohol, thereby eliminating the harmful effect on PCR while maintaining nucleic acid purification quality
Solution Approach 2:
The patent changes the chemical composition parameters of the elution buffer by substituting alcohol with other buffering agents, altering the solvent properties to achieve both effective nucleic acid elution and PCR compatibility
2Manufacturing precision
If centrifugation is used to remove residual alcohol and process samples, then nucleic acid purification is improved, but aerosol generation occurs and equipment complexity increases
Solution Approach 1:
The patent replaces the mechanical centrifugation system with a chemical solution approach by using alternative elution buffers that eliminate the need for high-speed spinning, thereby removing the source of aerosol generation while maintaining purification effectiveness
Solution Approach 2:
The patent extracts the requirement for centrifugation from the protocol by using buffer systems that achieve alcohol removal and nucleic acid elution without mechanical separation, eliminating the harmful aerosol generation
3Manufacturing precision
If high salt concentrations are used in washing buffers, then nucleic acid binding is enhanced, but the protocol becomes unsuitable for point-of-care use due to equipment requirements
Solution Approach 1:
The patent changes the salt concentration parameter in washing buffers to lower levels that still maintain adequate nucleic acid binding efficiency while eliminating the need for complex equipment, making the protocol suitable for point-of-care use
Solution Approach 2:
The patent develops a simplified buffer system that performs multiple functions (washing, binding, and elution) effectively at lower salt concentrations, making the protocol universally applicable in resource-limited settings without requiring specialized equipment
4Manufacturing precision
If commercial silica columns are used for nucleic acid isolation, then purification quality is improved, but cost and device complexity increase
Solution Approach 1:
The patent employs disposable cotton swabs as a single-use extraction medium that provides effective nucleic acid purification without the need for expensive, complex commercial silica column systems, achieving similar results with a simpler, cheaper alternative
Solution Approach 2:
The patent creates a simplified version of the silica column function using cotton-based materials that replicate the nucleic acid binding and purification capabilities without requiring the complex silica matrix structure, thereby reducing device complexity
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 cotton-based method provides efficient and rapid nucleic acid extraction, producing PCR-ready samples with minimal equipment, suitable for various sample types and volumes, and is cost-effective, eliminating the need for centrifuges and reducing PCR inhibitor presence.
Implementation Method 1
adding a binding buffer to the solution of step (a) to bind the nucleic acid to a matrix
Data Source
Figure 1a~1f
Figure 2a~2f
Figure 3a~3f
AI summary
The present disclosure provides a method to isolate natural & artificial nucleic acids like deoxyribonucleic acid (DNA), ribonucleic acid (RNA) and peptide nucleic acid (PNA) from a solid or liquid sample using cotton. The cotton packed is such that, a solution containing nucleic acids passes through it and the nucleic acids in solution are bound to the cotton in a medium optimal for binding. The nucleic acids are bound to cotton in such a way that, the bound nucleic acids can withstand multiple washes with liquid comprising water and gets eluted in an aqueous buffer, with which eluted nucleic acids can be directly used for amplification using PCR or for any other biochemical or molecular biology needs.