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Tips on Making Tiny Tips: Secrets to Submicron Nanoelectrospray Emitters.

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Nanoelectrospray ionization emitters with submicron tips improve native mass spectrometry by resolving protein charge states and preventing aggregation in high-salt buffers. This study details factors affecting emitter tip morphology for reproducible results.

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Area of Science:

  • Analytical Chemistry
  • Biophysics

Background:

  • Nanoelectrospray ionization (nESI) emitters are crucial for native mass spectrometry (MS).
  • Submicron tip diameters offer advantages in resolving charge states and preventing aggregation.
  • Challenges exist in producing and utilizing these emitters with complex biological samples.

Purpose of the Study:

  • To investigate factors influencing nanoelectrospray ionization emitter tip morphology.
  • To provide a protocol for reproducible submicron emitter fabrication.
  • To offer guidelines for using these emitters in native MS with high-salt buffers.

Main Methods:

  • Fabrication of nanoelectrospray ionization emitters using a Sutter Instrument P-87 tip puller.
  • Systematic variation of pulling parameters (Pull, Velocity, Pressure, Heat, Time).
  • Morphological analysis of emitter tips.

Main Results:

  • The 'Pull' parameter significantly impacts tip diameter and morphology.
  • 'Velocity' influences the taper region, while 'Time' has minimal effect above a threshold.
  • Reproducible submicron emitters can be fabricated by optimizing pulling parameters.

Conclusions:

  • Optimized fabrication protocols enable the production of submicron emitters for native MS.
  • These emitters facilitate analysis of proteins and complexes in challenging high-salt buffer conditions.
  • The findings aim to broaden the application of nESI-MS in biomolecular analysis.