Native Hemoglobin Variant Detection via Electron Transfer Dissociation
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Solution Overview
Problem
Current mass spectrometry methods for detecting native hemoglobin variants are complex and time-consuming, requiring denatured hemoglobin and extensive sample preparation, which is not suitable for clinical diagnostics.
Innovation Solution
A method using Electron Transfer Dissociation (ETD) mass spectrometry that ionizes native human hemoglobin, generates fragment ions, and analyzes them to identify variants without the need for denaturation or complex sample preparation, utilizing minimal sample volume and neutral buffers, enabling rapid and precise detection of hemoglobin variants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If denatured hemoglobin is used with complex sample preparation, then measurement precision is improved, but analysis time and device complexity increase
Solution Approach 1:
The patent changes the ionization parameters and mass spectrometry detection parameters to enable direct analysis of native hemoglobin. By using electrospray ionization with optimized voltage parameters and ETD fragmentation conditions, the method achieves variant detection without denaturation, thus eliminating time-consuming sample preparation while maintaining detection accuracy
Solution Approach 2:
The patent extracts only the essential detection function from the complex sample preparation process. By using liquid biopsy samples directly with minimal processing (only buffer exchange if needed), the method removes unnecessary denaturation and extensive purification steps, achieving rapid detection in minutes while maintaining precision through targeted mass spectrometry analysis
2Measurement precision
If denatured hemoglobin is used with complex sample preparation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent enables the hemoglobin sample to serve itself by maintaining its native state throughout analysis. The native hemoglobin structure is preserved and directly analyzed by the mass spectrometer with appropriate ionization parameters, eliminating the need for external denaturation agents and complex preparation devices, thus reducing device complexity while maintaining detection precision
Solution Approach 2:
The patent creates a universal sample preparation protocol that works for both native and variant hemoglobin forms. The same simple liquid biopsy collection and direct injection method applies to all samples, eliminating the need for different preparation procedures for different hemoglobin types, thus simplifying the overall device and protocol complexity
3Loss of time
If native hemoglobin is analyzed directly, then analysis time is reduced, but measurement precision may worsen
Solution Approach 1:
The patent introduces ETD (Electron Transfer Dissociation) as an intermediary mechanism that bridges native hemoglobin structure and variant detection. The ETD process uses electron transfer from reagent ions to fragment the native hemoglobin in a controlled manner that preserves sequence information, enabling precise variant detection without denaturation and maintaining both speed and accuracy
Solution Approach 2:
The patent uses dynamic control of ionization and fragmentation parameters to optimize detection of native hemoglobin. By dynamically adjusting electrospray voltage, ETD electron energy, and mass spectrometry scanning parameters based on the native structure characteristics, the method achieves high precision variant detection from undenatured samples in rapid time
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 allows for a quick, simple, and clinically relevant diagnosis of hemoglobin variants with reduced sample preparation and analysis time, providing precise determination of hemoglobin variants using minimal blood samples and reducing chemical noise in mass spectra.
Implementation Method 1
subjecting the parent or precursor ions to Electron Transfer Dissociation fragmentation so as to generate a plurality of fragment ions
Implementation Method 2
ionising a native human hemoglobin sample to generate parent or precursor ions
Data Source
AI summary
A method of screening or testing a sample is disclosed that comprises ionising a native human hemoglobin sample to generate parent or precursor ions, subjecting the parent or precursor ions to Electron Transfer Dissociation fragmentation so as to generate a plurality of fragment ions, mass analysing the fragment ions and determining whether or not the fragment ions include fragment ions which are indicative of a variant of hemoglobin.