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Related Concept Videos

Electrospray Ionization (ESI) Mass Spectrometry01:12

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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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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
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Matrix-Assisted Laser Desorption Ionization (MALDI)01:08

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Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI spectrometry is widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.
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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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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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Sample Preparation for Probe Electrospray Ionization Mass Spectrometry
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Electroactive Polymer-Based Spray Ionization for Direct Mass Spectrometric Analysis.

Xu Wang1, David D Hebert2, Damilola O Runsewe1

  • 1Materials Science, Engineering and Commercialization Program, Texas State University, San Marcos, Texas 78666, United States.

Journal of the American Society for Mass Spectrometry
|September 23, 2022
PubMed
Summary
This summary is machine-generated.

Electroactive polymer (EAP) films enhance ambient ionization mass spectrometry (MS) analysis. This novel EAP spray ionization (EAPSI) method improves detection limits and requires minimal sample volumes for rapid MS analysis.

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Ambient ionization mass spectrometry (MS) offers rapid analysis but can be limited by sensitivity and sample volume requirements.
  • Electroactive polymers (EAPs) possess tunable properties suitable for developing novel ionization interfaces.
  • Enhancing MS performance with advanced materials is crucial for broader applications.

Purpose of the Study:

  • To investigate electrochemically deposited electroactive polymer (EAP) films for improving ambient ionization mass spectrometry (MS).
  • To evaluate the performance of EAP spray ionization (EAPSI) compared to paper spray ionization (PSI) using various analytes and matrices.
  • To assess the potential of EAPSI for sensitive, rapid MS analysis with small sample volumes.

Main Methods:

  • Electropolymerization of EAPs, including poly[3,4-(2-dodecylethylenedioxy)thiophene] (PEDOT-C12), onto indium tin oxide-coated glass.
  • Application of EAP films in an ambient ionization MS setup, utilizing high voltage (3.5-4.5 kV) for ionization.
  • Analysis of peptides and small molecule pharmaceuticals in different solvents and biological fluid matrices using EAPSI and PSI.

Main Results:

  • EAPSI demonstrated stable and reproducible spray generation with minimal sample consumption (0.1 μL).
  • Limits of detection (LOD) and quantitation (LOQ) for EAPSI were improved by 1-2 orders of magnitude compared to PSI in solvent-based samples.
  • EAPSI showed comparable LOD and LOQ to PSI in complex biological matrices like artificial urine and saliva.

Conclusions:

  • EAP films, particularly PEDOT-C12, effectively enhance ambient ionization MS performance.
  • EAPSI offers a promising technique for rapid MS analysis with high sensitivity, accuracy, and reduced sample requirements.
  • This technology holds potential for miniaturization of MS instruments and broader analytical applications.