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Related Concept Videos

Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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Mass Analyzers: Overview01:13

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Mass Spectrometry: Overview01:19

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Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass.  One common type of ionization, known as electrospray ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave...
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Related Experiment Video

Updated: Sep 22, 2025

Sample Preparation for Probe Electrospray Ionization Mass Spectrometry
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Surface Modified Nano-Electrospray Needles Improve Sensitivity for Native Mass Spectrometry.

Marius M Kostelic1, Chih-Chieh Hsieh1, Henry M Sanders1

  • 1Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States.

Journal of the American Society for Mass Spectrometry
|May 19, 2022
PubMed
Summary

Surface-modified nanoelectrospray ionization needles enhance sensitivity for native mass spectrometry (MS) and charge detection-mass spectrometry (CD-MS). This simple method improves data quality for analyzing proteins and viral capsids.

Keywords:
charge detection mass spectrometryelectrospray ionizationnative mass spectrometrysilane chemistry

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Biophysics

Background:

  • Native mass spectrometry (MS) and charge detection-mass spectrometry (CD-MS) are powerful techniques for analyzing large biomolecules.
  • Non-specific adsorption of analytes to glass nanoelectrospray ionization (nESI) needles can reduce sensitivity and data quality.
  • Improving nESI efficiency is crucial for characterizing challenging proteins and macromolecular complexes.

Purpose of the Study:

  • To enhance the sensitivity of native MS and CD-MS for analyzing proteins and viral capsids.
  • To investigate the impact of surface modification on nESI needle performance.
  • To provide a simple and cost-effective method for improving MS data acquisition.

Main Methods:

  • Surface modification of pulled borosilicate nESI needles using inert materials like polyethylene-glycol.
  • Analysis of proteins and adeno-associated viral capsids using native MS and CD-MS with modified and unmodified needles.
  • Comparison of signal intensity and data quality between modified and unmodified nESI needles.

Main Results:

  • Surface modification of nESI needles significantly improved signal intensity for both native MS of proteins and CD-MS of viral capsids.
  • The enhancement in signal intensity is hypothesized to be primarily due to increased flow rate from coated needles.
  • The modified needles offer a straightforward approach to boost sensitivity for difficult-to-analyze samples.

Conclusions:

  • Surface-modified nESI needles are an effective strategy for enhancing the sensitivity of native MS and CD-MS.
  • This technique provides a simple, inexpensive method to improve data quality for challenging biomolecular analyses.
  • Further investigation into the mechanistic basis of signal enhancement may reveal additional optimization strategies.