Nucleic Acid Purification via Direct Silica Binding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current nucleic acid purification methods involving phenol-based reagents face challenges in efficiently separating nucleic acids from proteins and lipids without contaminating downstream processes, as phenol is toxic and requires labor-intensive phase separation and centrifugation steps.
Innovation Solution
A method involving binding nucleic acid molecules to a silica substrate using chaotropic salts and alcohols, allowing direct binding from an organic suspension without separating phases or centrifugation, utilizing denaturing solvents like phenol and chaotropic agents to facilitate purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phenol-based reagents are used to separate nucleic acids from proteins and lipids, then nucleic acid purification is achieved, but phenol contamination interferes with downstream processes and requires labor-intensive phase separation and centrifugation steps
Solution Approach 1:
The patent extracts and removes the harmful phenol component from the purification process while retaining its useful function of denaturing proteins and solubilizing lipids. By using alternative binding agents that do not require phenol removal, the method eliminates the need for complex phase separation and centrifugation steps, directly addressing the contradiction between purification efficiency and process complexity
Solution Approach 2:
The patent introduces alternative binding agents as intermediaries between the nucleic acid and the silica substrate. These binding agents facilitate direct binding without requiring phenol-based reagents, thereby eliminating the need for subsequent phenol removal steps and simplifying the overall purification process
2Ease of manufacture
If phenol-based reagents are used for nucleic acid purification, then proteins and lipids are solubilized, but phenol is toxic and requires careful removal to avoid interfering with downstream processes
Solution Approach 1:
The patent converts the harmful phenol component into a beneficial denaturing solvent by using alternative binding agents that achieve the same protein denaturation and lipid solubilization effects without phenol toxicity. The method maintains the useful functions while eliminating the harmful effects, allowing direct binding without phenol removal
Solution Approach 2:
The patent changes the chemical parameters of the binding agent composition to eliminate phenol while maintaining effective nucleic acid binding. By adjusting the chemical composition and properties of the binding agent, the method achieves the same purification outcomes without the toxic effects of phenol, enabling direct binding from organic suspensions
3Reliability
If traditional phenol-based purification methods are used, then nucleic acids are separated from contaminants, but labor-intensive steps are required and throughput is limited
Solution Approach 1:
The patent merges multiple separation steps into a single direct binding operation. By combining the denaturation, solubilization, and binding functions into one step using alternative binding agents, the method eliminates the need for separate phase separation and centrifugation steps, thereby increasing throughput while maintaining separation reliability
Solution Approach 2:
The patent replaces the mechanical separation system (centrifugation and phase separation) with a chemical binding system. By using alternative binding agents that enable direct binding to silica substrates, the method substitutes mechanical separation operations with chemical interactions, eliminating labor-intensive steps and increasing productivity
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 efficiently purifies nucleic acids by reducing labor and minimizing phenol contamination, enabling high-throughput nucleic acid purification with reduced exposure to nuclease activity and contamination, suitable for both DNA and RNA purification.
Implementation Method 1
a binding agent comprising a chaotropic salt, an alcohol or a combination thereof
Implementation Method 2
contacting the sample to a silica substrate... thereby binding the nucleic acid molecule to the silica substrate
Implementation Method 3
organic solvents, such phenol, have been widely used to solubilize proteins and lipids associated with nucleic acids into an organic phase
Implementation Method 4
Once denatured, proteins are typically highly hydrophobic, while nucleic acids remain hydrophilic
Data Source
AI summary
Methods and composition for nucleic acid isolation are provided. In one embodiment, the invention provides a method for nucleic acid purification from biological samples extracted with phenol-based denaturing solvents, which does not require phase separation or nucleic acid precipitation. Methods according to the invention may also be used for differential isolation of RNA and DNA.