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Electrospray Ionization (ESI) Mass Spectrometry

Electrospray Ionization (ESI) Mass Spectrometry

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.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

Atomic Emission Spectroscopy: Overview

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

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Nanoelectrospray emitters: trends and perspective.

Graham T T Gibson¹, Samuel M Mugo, Richard D Oleschuk

¹Department of Chemistry, Queen's University, Kingston, Ontario, Canada K7L 3N6.

Mass Spectrometry Reviews

|May 30, 2009

Summary

Nanoelectrospray ionization enhances sensitivity and minimizes sample use by reducing flow rates. New emitter designs, particularly those creating multiple Taylor cones, further improve performance for mass spectrometry applications.

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Area of Science:

Analytical Chemistry
Mass Spectrometry

Background:

Electrospray ionization (ESI) offers sensitivity, robustness, and simplicity for coupling with mass spectrometry.
Reducing flow rates to the nanoelectrospray regime (<1,000 nL/min) minimizes sample consumption and increases sensitivity.

Purpose of the Study:

To review the evolution of nanoelectrospray emitters.
To highlight emitter designs that leverage multielectrospray for enhanced performance.

Main Methods:

Focus on the architectural evolution of electrospray emitters.
Investigate the impact of emitter geometry and voltage application on droplet formation.

Main Results:

Emitter design is critical for forming small droplets necessary for sensitive detection at low flow rates.
Multielectrospray emitters, producing multiple Taylor cones, demonstrate improved sensitivity and sample utilization.

Conclusions:

Advancements in nanoelectrospray emitter design are crucial for maximizing sensitivity and efficiency.
Multielectrospray emitter architectures represent a significant development in the field.