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Characterization of hemoglobin variants by MALDI-TOF MS using a polyurethane membrane as the sample support
M E McComb1, R D Oleschuk, A Chow
1Department of Chemistry, University of Manitoba, Winnipeg, Canada.
Analytical Chemistry
|December 30, 1998
Summary
This study introduces a minimally invasive method for analyzing hemoglobin variants using mass spectrometry on a special membrane. This technique allows for remote sample collection and transport, simplifying hemoglobin variant analysis.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Medical Diagnostics
Background:
- Hemoglobin variants require accurate and accessible diagnostic methods.
- Current blood sampling techniques can be invasive and limit remote analysis.
- Mass spectrometry offers high sensitivity for protein analysis.
Purpose of the Study:
- To develop a novel, minimally invasive method for hemoglobin variant analysis.
- To enable off-site sample collection and transportation for mass spectrometry.
- To characterize hemoglobin variants using a simplified workflow.
Main Methods:
- Utilized a nonporous polyurethane membrane for blood sample collection and transport.
- Employed Matrix-Assisted Laser Desorption/Ionization-Time Of Flight Mass Spectrometry (MALDI-TOF MS) directly on the membrane.
- Performed enzymatic digestion (trypsin) on the membrane for further characterization.
Main Results:
- Successfully demonstrated a minimally invasive blood collection (<1 microL) using a lancet.
- Developed a direct MALDI-TOF MS analysis on the membrane, reducing analysis time and sample loss.
- Characterized the Hb Shepherds Bush hemoglobin variant (b74-(E18)Gly-->Asp).
Conclusions:
- The novel membrane-based method provides a less invasive alternative to traditional blood draws.
- This technique facilitates remote sample analysis, suitable for underserved or remote locations.
- The method simplifies the workflow for hemoglobin variant identification and characterization.