Supercritical Fluid Chromatography Oligonucleotide Separation
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Solution Overview
Problem
Conventional liquid chromatography (LC) and high-performance liquid chromatography (HPLC) methods face challenges in effectively separating oligonucleotides with phosphorothioate linkages from their phosphodiester analogues, due to insufficient separation characteristics for molecular differences of one to several tens of atoms in oligonucleotides of several thousand molecular weight.
Innovation Solution
A method using a supercritical fluid chromatograph (SFC) with a mobile phase containing carbon dioxide and a modifier comprising ammonium, alkylamine, or amino alcohol, and an acid, which enhances the separation of oligonucleotides by improving the separation performance of target components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional liquid chromatography (LC) or high-performance liquid chromatography (HPLC) is used to separate oligonucleotides, then the method is simple and widely available, but the separation characteristic is insufficient to distinguish molecular differences of one to several tens of atoms in oligonucleotides of several thousand molecular weight
Solution Approach 1:
The patent changes the physical state parameter of the mobile phase from liquid to supercritical fluid, and adjusts compositional parameters by incorporating specific modifiers (ammonium, alkylamine, or amino alcohol with acid) to achieve sufficient separation of oligonucleotides with minimal molecular differences while maintaining reasonable operational complexity
Solution Approach 2:
The patent uses a composite mobile phase system combining supercritical carbon dioxide with specific organic modifiers, creating a composite material that provides both the solvation power needed for oligonucleotide separation and the molecular discrimination capability to resolve subtle structural differences
2Measurement precision
If a supercritical fluid chromatograph is used to separate oligonucleotides, then the separation performance is improved, but the device complexity increases
Solution Approach 1:
The patent utilizes parameter changes in the mobile phase (transitioning to supercritical state and adding modifiers) to achieve high separation precision, while the device complexity increase is managed by using a standard SFC platform with optimized parameters rather than fundamentally new equipment
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
The method successfully separates oligonucleotides with high accuracy, even when differences are minimal, as demonstrated by chromatogram results showing clear separation of oligonucleotides with distinct base sequences and linkage modifications.
Implementation Method 1
a fluid (supercritical fluid) having a temperature and pressure exceeding a critical point (critical temperature, critical pressure) as a main mobile phase
Implementation Method 2
separating components in the sample during passing through the column
Data Source
AI summary
A method for separating components using a supercritical fluid chromatograph, including: injecting a sample into a mobile phase containing a supercritical fluid and a modifier to introduce the sample into a column; and separating components in the sample during passing through the column; wherein the sample contains an oligonucleotide as a target component; the supercritical fluid contains carbon dioxide; and the modifier contains a solution containing at least one selected from the group consisting of ammonium, an alkylamine, and an amino alcohol, and an acid.