Size-Exclusion Separation of Free Analytes Without Equilibrium Disruption
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Solution Overview
Problem
Existing methods struggle to accurately separate and quantify non-protein-bound target analytes from biological fluid samples, as they often result in underestimation or loss of free analytes due to non-specific adsorption to surfaces and disrupt the equilibrium between free and protein-bound fractions during sample handling and analysis.
Innovation Solution
A novel size-exclusion chromatography method using organic solvents to elute free target analytes from a size-exclusion chromatography matrix, while maintaining the stability of macromolecular complexes, thereby separating and quantifying free analytes without disturbing the protein-bound fraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional separation methods are used to isolate free analytes, then separation is achieved, but free analytes are lost due to non-specific adsorption to surfaces
Solution Approach 1:
The patent uses size-exclusion chromatography as an intermediary separation technique that physically separates free analytes from protein-bound analytes based on size differences, preventing direct contact between free analytes and adsorptive surfaces. The chromatography matrix acts as a mediator that allows free analytes to pass through while retaining larger protein complexes, thereby eliminating non-specific adsorption losses.
2Measurement precision
If sample handling procedures are performed to separate free and bound fractions, then separation is achieved, but the equilibrium between free and protein-bound fractions is disrupted
Solution Approach 1:
The patent performs preliminary separation using size-exclusion chromatography before any other sample handling steps. This preliminary action separates free analytes from protein-bound analytes based on size, establishing distinct fractions that can be analyzed independently without disrupting the original equilibrium relationships. The separation occurs under controlled conditions that maintain the stability of protein-analyte complexes.
3Measurement precision
If conventional chromatography methods are used, then separation of analytes is achieved, but protein-bound analytes are disrupted
Solution Approach 1:
The patent applies size-exclusion chromatography with specifically selected matrix materials and pore sizes that create different separation conditions for different size ranges. The chromatography system is designed with local quality variations - the matrix structure provides size-selective pores that allow small free analytes to penetrate while excluding larger protein-bound complexes, achieving separation without disrupting the integrity of macromolecular complexes.
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
Accurately determines the concentration of free analytes by preventing adsorption to surfaces and preserving the equilibrium between free and bound states, ensuring precise quantification.
Implementation Method 1
passing the aqueous sample through a size exclusion chromatography matrix with a molecular weight cut off sufficient to allow the free form of the target analyte to permeate into pores of the size exclusion chromatography matrix and exclude the one or more target analyte binding proteins with bound target analyte
Implementation Method 2
eluting the target analyte from the size exclusion chromatography matrix with an organic solvent
Data Source
AI summary
A method of separating free target analyte from protein-bound target analyte is described. Such can include obtaining an aqueous sample containing a target analyte in a free form (free target analyte) and the target analyte in a protein-bound form (protein-bound target analyte), passing the aqueous sample through a size exclusion chromatography matrix with a molecular weight cut off sufficient to allow the free target analyte to permeate into pores of the size exclusion chromatography matrix and exclude the protein-bound target analyte, whereupon the free target analyte adheres to and is immobilized by the size exclusion chromatography matrix and the protein-bound target analyte does not adhere to by the size exclusion chromatography matrix, separating the free target analyte from the protein-bound analyte by removing the protein-bound target analyte from the size exclusion chromatography matrix, and eluting the free target analyte from the size exclusion chromatography matrix with an organic solvent.