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Large-scale Top-down Proteomics Using Capillary Zone Electrophoresis Tandem Mass Spectrometry

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Chiral electrokinetic chromatography-electrospray ionization-mass spectrometry using a double junction interface.

Sih-Hua Hung¹, Wen-Shuo Cheng, Ju-Li Huang

¹Department of Chemistry, National Taiwan University, Taipei, Taiwan, R.O.C.

Electrophoresis

|March 28, 2012

Summary

A novel double junction interface enhances electrokinetic chromatography-mass spectrometry by preventing ion suppression from sulfated β-cyclodextrin (S-β-CD). This improves chiral separation sensitivity for analytes like dihydroxyphenylalanine enantiomers.

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Area of Science:

Analytical Chemistry
Separation Science

Background:

Electrokinetic chromatography-electrospray ionization-mass spectrometry (EKC-ESI-MS) is powerful for chiral analysis.
Sulfated β-cyclodextrin (S-β-CD) is a common chiral selector but can cause ion suppression.
Maintaining separation efficiency and sensitivity with S-β-CD requires specialized interfaces.

Purpose of the Study:

To develop and validate a double junction interface for EKC-ESI-MS.
To mitigate ion suppression caused by S-β-CD in chiral EKC-ESI-MS.
To improve the sensitivity and efficiency of chiral separations using S-β-CD.

Main Methods:

A double junction interface was designed to separate the S-β-CD from the analyte stream before MS detection.
Chiral EKC-ESI-MS was performed on dihydroxyphenylalanine and methyldihydroxyphenylalanine enantiomers.
Two modes were tested: counter-migration (low S-β-CD concentration) and carrier (high S-β-CD concentration).

Main Results:

The double junction interface effectively preserved separation efficiency in both counter-migration and carrier modes.
Ion suppression from S-β-CD was significantly alleviated, especially in the high-concentration carrier mode.
Analyte sensitivity was substantially improved due to the reduction in ion suppression.

Conclusions:

The double junction interface is a robust solution for overcoming S-β-CD-induced ion suppression in EKC-ESI-MS.
This method enhances the utility of S-β-CD for sensitive chiral analysis.
The interface design offers improved performance for complex separation challenges.