Electroelution of DNA from Dried Biological Samples
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Solution Overview
Problem
Current methods for extracting genetic material from solid media, such as Whatman FTA substrates, require labor-intensive processes involving detergents or high temperatures, which can interfere with analysis and fragment the genetic material.
Innovation Solution
A method for electroeluting genetic material directly from chemically treated cellulose-based solid media, using chemicals that lyse the biological sample and preserve the genetic material, allowing for direct extraction without detergents and high temperatures, and including steps for DNA repair and removal of chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If detergents or high temperatures are used for DNA extraction from solid media, then extraction efficiency is improved, but genetic material fragmentation increases and labor intensity increases
Solution Approach 1:
The patent changes the physical parameters of the extraction process by using electroelution with controlled electric fields and low temperatures instead of chemical detergents and high temperatures. This parameter change maintains extraction efficiency while preventing DNA fragmentation that occurs with traditional methods.
Solution Approach 2:
The patent replaces the chemical-mechanical extraction system (detergents and manual processing) with an electrodynamic system. Electric fields are used to drive DNA migration from the solid medium into the elution buffer, substituting chemical action with electrical action to reduce fragmentation.
2Productivity
If detergents or high temperatures are used for DNA extraction from solid media, then extraction efficiency is improved, but labor intensity increases
Solution Approach 1:
The electroelution system is designed to perform extraction automatically once set up. The electric field automatically drives DNA migration from the solid medium into the buffer without requiring manual manipulation or complex chemical protocol steps, reducing labor intensity while maintaining efficiency.
3Quantity of substance
If traditional extraction methods are used, then genetic material can be extracted, but additional processing steps are required to remove detergents
Solution Approach 1:
The patent extracts only the essential component (DNA) directly into a clean buffer system through electroelution, leaving behind the solid medium and avoiding the need to extract or remove detergents. This selective extraction simplifies the overall process by eliminating detergent removal 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 method reduces the labor required for DNA extraction while minimizing fragmentation, enabling high molecular weight DNA extraction with minimal processing, suitable for both fixed and non-fixed samples, and facilitating subsequent analyses like PCR.
Implementation Method 1
electroeluting the genetic material directly from the solid medium to a subsequent medium
Data Source
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AI summary
In accordance with the present disclosure, a method for extracting genetic material from a biological sample stored on a solid medium is provided. The method includes obtaining the solid medium, wherein the biological sample is applied on the solid medium, and the solid medium includes chemicals that lysed the biological sample and preserved the genetic material. The method also includes electroeluting the genetic material directly from the solid medium to a subsequent medium.