Chaotropic Pretreatment for Accurate Oligonucleotide Analysis
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Solution Overview
Problem
Existing methods for detecting and quantifying oligonucleotides in biological matrices face challenges such as low extraction recoveries, long preparation times, sample degradation, and interference from complex matrix components, leading to inaccurate results.
Innovation Solution
A method involving chaotropic agents, proteases, and disulfide-reducing agents is used to pretreat biological samples, disrupting intermolecular interactions and facilitating the extraction of oligonucleotides and cationic lipids, followed by analytical techniques like mass spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional extraction techniques (PPT, LLE, SPE) are used to extract oligonucleotides from biological matrices, then extraction can be performed, but extraction recoveries are low and preparation times are long
Solution Approach 1:
The patent changes the chemical parameters of the extraction system by introducing chaotropic agents (guanidinium thiocyanate, ammonium hydroxide, sodium hydroxide) to alter the solubility and interaction properties of oligonucleotides with biological matrices. This chemical parameter change enables more efficient extraction with higher recoveries and shorter times compared to traditional physical extraction methods.
Solution Approach 2:
The patent uses chaotropic agents as intermediary substances that mediate between the oligonucleotide and the biological matrix. These agents disrupt protein-nucleic acid interactions and facilitate the release of oligonucleotides from cellular structures, enabling more effective extraction without requiring extended processing times.
2Productivity
If traditional extraction techniques are used, then oligonucleotides can be extracted, but sample manipulation leads to oligo degradation
Solution Approach 1:
The patent extracts and removes interfering substances (proteins, lipids, salts) from the biological matrix using chaotropic agents, thereby isolating the oligonucleotide in a cleaner state. This extraction of interferents reduces degradation pathways and maintains oligo integrity throughout the analysis process.
Solution Approach 2:
The patent converts the potentially harmful effect of chaotropic agents (which can denature proteins and disrupt structures) into a beneficial outcome by using this disruption to release and protect oligonucleotides from degradation. The same chemical forces that could harm the oligonucleotide are instead harnessed to protect it from biological interferents.
3Productivity
If traditional extraction techniques are used, then analysis can be performed, but complex biological matrices introduce interferences that affect accuracy
Solution Approach 1:
The patent introduces chaotropic agents as intermediary substances that selectively interact with and disrupt the complex biological matrix components (proteins, lipids, salts), thereby removing these interferents from the analysis pathway. This mediation allows for more accurate oligonucleotide quantification by eliminating background noise and interference from the complex biological environment.
4Productivity
If extraction time is increased to improve recovery, then more oligonucleotides can be extracted, but ex vivo conversion via nuclease activity increases leading to inaccurate data
Solution Approach 1:
The patent performs preliminary action by rapidly disrupting cellular structures and releasing oligonucleotides from biological matrices using chaotropic agents at the beginning of the extraction process. This preliminary disruption prevents nuclease activity from acting on the oligonucleotides during extended extraction times, thereby maintaining data accuracy while achieving high recovery rates through the chemical action rather than prolonged physical extraction.
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 enhances extraction recovery and accuracy, allowing for rapid and robust detection and quantification of oligonucleotides and lipids, compatible with downstream analytical methods.
Implementation Method 1
The compositions of the present disclosure include a chaotropic agent, an optional protease, and/or an optional disulfide-reducing agent
Implementation Method 2
The compositions of the present disclosure include a chaotropic agent, an optional protease, and/or an optional disulfide-reducing agent
Implementation Method 3
The compositions of the present disclosure include a chaotropic agent, an optional protease, and/or an optional disulfide-reducing agent
Implementation Method 4
The most commonly used techniques to facilitate extraction include protein precipitation (PPT), liquid-liquid extraction (LLE), and solid phase extraction (SPE)
Implementation Method 5
The most commonly used techniques to facilitate extraction include protein precipitation (PPT), liquid-liquid extraction (LLE), and solid phase extraction (SPE)
Data Source
AI summary
The present disclosure provides compositions and methods for sample processing, particularly for oligonucleotide analysis e.g. analysis of formulated nucleic acid drugs. A composition for pretreating at least one target nucleic acid in a biological mixture provided herein includes a chaotropic agent selected from a substituted guanidine, a substituted amidine, a substituted quaternary amine, or a combination thereof, an optional protease, and/or an optional disulfide-reducing agent. Methods of analyzing at least one target nucleic acid in a biological mixture is also provided herein. Furthermore, the present disclosure provides methods for quantifying at least one target cationic lipid interacting with a nucleic acid.