Label-Free Protein Behavior Detection in Complex Liquids
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Solution Overview
Problem
Existing methods for characterizing the behavior of therapeutic proteins in complex liquids like blood are limited by the need for labeling, which can alter the protein's behavior and provide unreliable results, and require pre-treatment that introduces artifacts.
Innovation Solution
A label-free method combining field flow fractionation (FFF) with selective detection techniques like ELISA or SPR, allowing characterization of proteins without labeling and pre-treatment, to study their interactions and aggregation in complex fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If labeling methods are used to detect component behavior in complex liquids, then detection sensitivity is improved, but the component's natural behavior is altered and reliability deteriorates
Solution Approach 1:
The patent extracts the detection function from the component itself by using a separate detection system (mass spectrometry) that can identify the component through its intrinsic properties without requiring any labels or modifications to the component. This allows detection while maintaining the component's natural state and behavior.
Solution Approach 2:
The patent introduces an intermediary detection system (mass spectrometry with selective ionization) that mediates between the component and the detection process. This intermediary can selectively detect and identify the component based on its mass-to-charge ratio without physically interacting with or modifying the component, thus maintaining reliability while achieving detection.
2Measurement precision
If pre-treatment methods are applied to complex liquid samples, then measurement precision is improved, but artifacts are introduced and reliability deteriorates
Solution Approach 1:
The patent performs preliminary separation of components by size using field-flow fractionation before detection, which allows accurate identification of aggregates without requiring post-sample preparation or treatment that could introduce artifacts. The separation occurs in a gentle, non-denaturing environment that preserves sample integrity.
Solution Approach 2:
The patent replaces traditional mechanical pre-treatment methods (centrifugation, filtration, precipitation) with a field-based separation method (field-flow fractionation) that uses controlled fields to separate components based on size. This substitution eliminates mechanical stress and chemical additives that could introduce artifacts while maintaining measurement precision.
3Weight of moving object
If SEC methods are used for aggregate analysis, then separation capability is improved, but measurement accuracy deteriorates due to erroneous estimates
Solution Approach 1:
The patent introduces mass spectrometry as an intermediary detection method that directly measures the mass-to-charge ratio of separated components. This provides accurate identification and quantification of aggregates without relying on indirect estimates from chromatographic elution profiles, thereby improving measurement precision while maintaining separation capability.
Solution Approach 2:
The patent uses mass spectrometric detection which provides distinct mass-to-charge ratio signatures for different aggregate sizes and compositions. This allows direct identification and quantification of aggregates based on their inherent mass properties rather than indirect chromatographic behavior, improving measurement accuracy.
4Difficulty of detecting and measuring
If fluorescent labeling is applied to study protein behavior in serum, then detection capability is improved, but chemical properties are altered and reliability deteriorates
Solution Approach 1:
The patent extracts the detection function from the protein by using a separate mass spectrometry system that can identify and quantify the protein based on its intrinsic mass-to-charge ratio. This eliminates the need for fluorescent labels and their associated chemical modifications, preserving the protein's natural composition and stability.
Solution Approach 2:
The patent creates a mass spectrum copy or fingerprint of the protein that can be used for identification and quantification without physically modifying the protein. The mass-to-charge ratio serves as a unique identifier that can be detected remotely, allowing study of protein behavior without altering its chemical properties.
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
Enables accurate characterization of protein behavior and aggregation in complex liquids without altering the proteins, providing insights into their interactions and stability in vivo.
Implementation Method 1
applying a field flow fractionation (FFF) to the sample
Implementation Method 2
applying to the fractions a label-free detection method selective for the first component
Implementation Method 3
applying to the fractions a label-free detection method selective for the first component
Data Source
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AI summary
The present disclosure relates to a method and system for label-free characterization of the behavior of a component in a complex liquid sample, which does not require pretreatment of either the complex liquid sample or the first component.