Nucleic Acid Purification via Silica Binding in Phenol Lysates
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Solution Overview
Problem
Current nucleic acid purification methods require separation of organic and aqueous phases and often involve centrifugation, which is time-consuming and can lead to loss of nucleic acid, especially when phenol contamination inhibits downstream processes.
Innovation Solution
A method involving a silica substrate and a binding agent comprising chaotropic salts or alcohols allows direct binding of nucleic acids from phenol-containing samples without phase separation, using denaturing solvents like phenol, and eliminates the need for centrifugation by binding nucleic acids to silica substrates directly from an organic suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phenol-based reagents are used to solubilize proteins and lipids, then separation of nucleic acids from cellular matrices is improved, but phenol contamination interferes with downstream processes and requires careful removal
Solution Approach 1:
The invention extracts and removes phenol from the sample through a series of wash steps using ethanol-containing buffers. The phenol is selectively removed from the silica-bound nucleic acid preparation, allowing the nucleic acid to remain bound while the harmful phenol contaminant is washed away in the flow-through fractions.
Solution Approach 2:
Ethanol serves as an intermediary substance that facilitates the removal of phenol from the silica-bound nucleic acid. The ethanol-containing wash buffers act as a mediator that selectively solubilizes and removes phenol while maintaining nucleic acid binding to the silica matrix.
2Reliability
If phase separation and centrifugation steps are performed, then organic and aqueous phases are separated, but the process becomes time-consuming and may lead to loss of nucleic acid
Solution Approach 1:
The invention extracts and removes the organic phase (phenol) through sequential ethanol wash steps without requiring centrifugation or manual phase separation. The phenol is selectively removed in the flow-through while nucleic acids remain bound to the silica matrix, eliminating time-consuming separation steps.
Solution Approach 2:
The washing steps are performed in a continuous manner through the silica column or with magnetic beads, maintaining nucleic acid binding while continuously removing phenol. This continuous process eliminates the need for discrete centrifugation and phase separation steps, reducing overall processing time.
3Ease of operation
If nucleic acids are precipitated prior to binding, then phase separation is facilitated, but nucleic acid loss increases and processing complexity increases
Solution Approach 1:
The invention performs preliminary binding of nucleic acids to the silica matrix directly from the phenol-containing lysate without prior precipitation. The silica substrate is prepared in advance, and nucleic acids are bound in a single step, eliminating the need for precipitation and subsequent washing steps that cause nucleic acid loss.
Solution Approach 2:
The invention combines the binding and phenol removal steps into a single integrated process. Nucleic acids are bound to silica and phenol is removed through washing in one continuous operation, rather than performing separate precipitation, binding, and washing steps that increase complexity and nucleic acid loss.
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, reduces phenol contamination, minimizes nuclease exposure, and is suitable for high-throughput protocols by eliminating the need for phase separation and centrifugation, ensuring high-quality RNA and DNA isolation.
Implementation Method 1
contacting the sample to a silica substrate in the presence of a binding agent comprising a chaotropic salt, an alcohol or a combination thereof, thereby binding the nucleic acid molecule to the silica substrate
Implementation Method 2
contacting the sample to a silica substrate in the presence of a binding agent comprising a chaotropic salt, an alcohol or a combination thereof, thereby binding the nucleic acid molecule to the silica substrate
Data Source
AI summary
Methods and composition for nucleic acid isolation are provided. In one embodiment, a method is provided for nucleic acid purification from biological samples, such as whole blood 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 of small RNAs (e.g., siRNAs or miRNAs) purification and are amenable to automation.