Quantitative Endogenous Polyamine Analysis via Capillary Electrophoresis/Mass Spectrometry: Characterization and...

Area of Science:

• Analytical Chemistry
• Biochemistry

Background:

• Traditional polyamine analysis methods like derivatization and liquid chromatography (LC) have limitations.
• Capillary electrophoresis (CE) excels at separating small, highly charged molecules based on electrophoretic mobility.

Purpose of the Study:

• To evaluate the performance of a microfluidic CE-mass spectrometry (mCE-MS) platform for polyamine analysis.
• To assess the potential of mCE-MS to overcome challenges in robustness and reproducibility of traditional CE-MS.

Main Methods:

• Utilized a microfluidic CE-MS platform for polyamine separation and detection.
• Optimized MS acquisition rates and considered isotachophoresis to manage peak characteristics.
• Investigated chip-to-chip variability in the commercial CE-MS interface.

Main Results:

• Achieved a limit of detection (LOD) as low as 0.25 ng/mL for spermidine.
• Successfully detected endogenous spermidine in blood samples.
• Observed significant chip-to-chip variability impacting peak shape and LOD, complicating absolute quantitation.

Conclusions:

• The mCE platform demonstrates strong potential for sensitive polyamine detection, particularly for challenging matrices like blood.
• Interface variability presents a hurdle for robust absolute quantitation, necessitating practical guidance for users.
• mCE-MS offers a promising alternative to conventional techniques for polyamine analysis.