Nucleic Acid Isolation Using Heated Magnetic Silica Binding
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Solution Overview
Problem
Existing methods for nucleic acid isolation, such as those using phenol or chaotropic salts, result in impurities and low yields due to the presence of water-soluble materials, particularly in plant samples, and require time-consuming purification steps.
Innovation Solution
The method involves heating a solution containing nucleic acids in the presence of chaotropic agents and alcohol before binding to magnetic silica particles, which enhances the binding efficiency and yield of RNA and DNA, especially at temperatures between 36°C to 75°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If classical extraction methods using phenol and chloroform are used, then nucleic acids can be separated from proteins, but water-soluble impurities remain in the aqueous phase requiring additional purification steps
Solution Approach 1:
The invention changes the temperature parameter during the binding step, performing it at elevated temperatures (37-65°C, preferably 50-60°C) rather than at room temperature or lower. This temperature parameter change improves the binding efficiency of nucleic acids to silica particles while reducing the solubility of water-soluble impurities, thereby resolving the contradiction between effective separation and impurity removal
2Reliability
If selective adsorption onto silica carriers is used, then nucleic acids can be purified from proteins, but considerable losses in yield occur when samples contain high fractions of spurious secondary materials
Solution Approach 1:
The invention applies temperature parameter changes during the binding step (37-65°C) to optimize the adsorption equilibrium. The elevated temperature enhances the binding affinity of nucleic acids to silica particles even in the presence of spurious materials, thereby maintaining high purification reliability while minimizing yield losses
Solution Approach 2:
The invention performs a preliminary heating step before binding to pre-heat the solution and optimize the binding conditions. This preliminary action ensures that the nucleic acids are in the optimal state for binding to silica particles, reducing losses that would otherwise occur when samples contain high fractions of interfering materials
3Reliability
If multi-stage procedures with different buffer solutions are used, then nucleic acid purity can be improved, but the process time and complexity increase significantly
Solution Approach 1:
The invention simplifies the multi-stage procedure by performing the binding step at elevated temperatures (37-65°C), which enhances binding efficiency and reduces the need for extensive washing and purification steps. This parameter change maintains high purity while significantly reducing the overall process time
Solution Approach 2:
The invention extracts nucleic acids directly onto silica particles in a single binding step at elevated temperature, removing the need for multiple sequential buffer additions and washing steps. This extraction approach maintains purity by effectively separating nucleic acids from impurities in one step while reducing process time
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 improves the yield and purity of nucleic acid isolation, as demonstrated by increased PCR efficiency across various nucleic acid species, including viral RNA and DNA, with minimal impurities and reduced need for extensive purification.
Implementation Method 1
binding to magnetic silica particles
Implementation Method 2
heating a solution containing nucleic acids in the presence of chaotropic agents and alcohol before binding
Data Source
AI summary
The present invention concerns an improved method for the isolation of nucleic acids such as DNA and RNA from bacterial, plant, animal or human cells as well as from cell cultures and virus cultures, wherein the nucleic acid is immobilised on a matrix having a silicon-oxygen compound in the presence of a chaotropic agent and an alkanol, carried out in a temperature range of 36° to 75° C.