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Sample Preparation for Probe Electrospray Ionization Mass Spectrometry
Published on: February 19, 2020
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A new mass spectrometry electrospray tip obtained via precise mechanical micromachining
Yan-Zin Chang1, Mu-Wen Yang, Gou-Jen Wang
1Institute of Medical and Molecular Toxicology, Chung-Shan Medical University, Taichung 402, Taiwan.
Analytical and Bioanalytical Chemistry
|August 11, 2005
Summary
A novel beveled electrospray tip enhances analytical sensitivity in plastic electrophoresis chip/electrospray mass spectrometry. This durable, low-cost design improves fluid stability and reduces moisture accumulation for better performance.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry
- Microfluidics
Background:
- Conventional tapered capillary tips in electrophoresis chip/electrospray mass spectrometry can suffer from limitations in durability and cost.
- Moisture accumulation at the spray tip outlet can negatively impact analytical sensitivity and fluid stability.
Purpose of the Study:
- To design and evaluate a novel electrospray tip with a beveled edge for plastic electrophoresis chip/electrospray mass spectrometry.
- To improve analytical sensitivity, ruggedness, durability, and cost-effectiveness compared to existing designs.
Main Methods:
- Theoretical hydrodynamic analysis was performed to model the impact of spray tip geometry on analytical sensitivity.
- A new electrospray tip was fabricated using a hydrophobic polymer, surpassing glass in moisture resistance.
- Experimental results were compared against a standard flat-head tip and conventional tapered tips.
Main Results:
- The beveled electrospray tip demonstrated superior analytical sensitivity compared to the flat-head tip.
- The proposed design offers comparable sensitivity to tapered tips but with enhanced ruggedness and durability.
- The use of a hydrophobic polymer effectively restricted moisture accumulation at the tip outlet.
- The fabricated tip is significantly more cost-effective than conventional spray tips.
Conclusions:
- The beveled electrospray tip represents a significant advancement for plastic electrophoresis chip/electrospray mass spectrometry.
- The design offers a practical, high-performance, and economical alternative to existing spray tip technologies.
- Further optimization of the sample wall geometry can potentially enhance fluid stability and analytical performance.
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