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Fully Automated Centrifugal Microfluidic Device for Ultrasensitive Protein Detection from Whole Blood
Published on: April 16, 2016
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Improving sensitivity and linear dynamic range of intact protein analysis using a robust and easy to use microfluidic
Gregory T Roman1, James P Murphy1
1Waters Corporation, Milford, MA 010757, USA. Gregory_Roman@waters.com.
The Analyst
|March 3, 2017
Summary
This study introduces a microfluidic liquid chromatography (LC) device coupled with mass spectrometry (MS) that significantly enhances sensitivity and linearity for intact protein analysis. The new method improves detection limits by 15x for antibodies, offering a powerful tool for biopharmaceutical research.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Mass Spectrometry
Background:
- Intact protein analysis using LC-MS is crucial for biopharmaceutical characterization.
- Conventional methods often face limitations in sensitivity and quantitative range.
- Optimizing charge state distributions (CSD) is key to improving MS signal intensity.
Purpose of the Study:
- To develop an integrated microfluidic LC-QTOF system for enhanced intact protein analysis.
- To improve sensitivity, linearity, and charge state resolution for antibody characterization.
- To demonstrate the utility of microflow electrospray ionization (ESI) and post-column modifications.
Main Methods:
- Integration of a microfluidic LC device with a QTOF mass spectrometer.
- Utilizing microflow ESI to tune charge state distributions (CSD).
- Employing post-column supercharging (glycerol) and decharging (imidazole) techniques.
Main Results:
- Achieved a 15x improvement in sensitivity for intact antibodies compared to high-flow ESI.
- Demonstrated a 1.5 orders of magnitude increase in linear dynamic range.
- Observed an 89% sensitivity increase with glycerol supercharging and a 51% increase in charge state resolution with imidazole decharging.
- Established a limit of detection of 0.1 ng for IgG antibodies.
Conclusions:
- The developed microfluidic LC-QTOF system offers superior sensitivity and quantitative linear dynamic range for intact protein analysis.
- Microflow ESI and post-column modifications effectively enhance MS performance for complex biologics.
- This technique provides a versatile and user-friendly platform for advanced protein characterization.
