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Related Concept Videos

Mass Spectrometers01:16

Mass Spectrometers

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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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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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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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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 is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
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Ionization Energy

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The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
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IR Spectrometers01:25

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Updated: Jan 22, 2026

Sample Preparation for Probe Electrospray Ionization Mass Spectrometry
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High-Throughput and Direct Sample Screening Using a Laser Spray Ionization Miniature Mass Spectrometer.

Chuangui Zhou1,2, Hanyan Wu2,3, Xiaohua Zhang4

  • 1ATR Key Laboratory of National Defense Technology, Guangdong Key Laboratory of Intelligent Information Processing, College of Electronics and Information Science , Shenzhen University , Shenzhen 518060 , China.

Analytical Chemistry
|July 3, 2019
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Summary

Miniature mass spectrometry (MS) systems are advancing with a new laser spray ionization (LSI) source and 2D platform. This enables high-throughput analysis of complex samples, identifying nanogram levels of analytes in seconds.

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Area of Science:

  • Analytical Chemistry
  • Instrument Development
  • Mass Spectrometry

Background:

  • Significant progress in mass spectrometer (MS) miniaturization over the last two decades.
  • Miniature MS systems are nearing practical application due to improved analytical performance.
  • High-throughput analysis and minimal sample preparation are crucial for real-world MS applications.

Purpose of the Study:

  • To develop a miniaturized mass spectrometry system.
  • To integrate a 2D moving platform and a laser spray ionization (LSI) source.
  • To optimize a patterned sample holder for automated, high-throughput sample analysis.

Main Methods:

  • Development of a miniature mass spectrometry system.
  • Incorporation of a 2D moving platform for sample positioning.
  • Utilization of a laser spray ionization (LSI) source for direct analysis of analytes in complex matrices.
  • Design and optimization of a patterned sample holder for automated sample handling.

Main Results:

  • Demonstrated direct mass analysis of analytes within complex matrices using LSI.
  • Achieved high-throughput analysis of diverse samples enabled by the 2D moving platform.
  • Established good linearity for quantitative analysis across multiple samples.
  • Identified nanogram quantities of drugs, peptides, and vitamin B in diluted whole blood.
  • Attained an average scan time of 10 seconds per sample.

Conclusions:

  • The developed miniature MS system with LSI and a 2D platform facilitates high-throughput analysis.
  • The system allows for direct analysis of analytes in complex samples with minimal preparation.
  • The technology shows promise for rapid identification and quantification of various substances in biological samples.