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Related Concept Videos

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.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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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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Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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Mass Analyzers: Overview01:13

Mass Analyzers: Overview

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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 Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Sample Preparation for Probe Electrospray Ionization Mass Spectrometry
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Real-time sample analysis using a sampling probe and miniature mass spectrometer.

Chien-Hsun Chen1, Ziqing Lin1, Ran Tian2

  • 1Weldon School of Biomedical Engineering, Purdue University , West Lafayette, Indiana 47907, United States.

Analytical Chemistry
|August 4, 2015
PubMed
Summary
This summary is machine-generated.

A new miniature mass spectrometry system with a long sampling probe enables real-time chemical analysis of surfaces. This portable device is effective for field applications like forensics and medical diagnostics.

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Area of Science:

  • Analytical Chemistry
  • Instrumentation Science

Background:

  • Real-time chemical analysis of complex samples, especially in situ, remains a significant challenge.
  • Existing mass spectrometry (MS) systems often lack portability and require extensive sample preparation, limiting field applicability.

Purpose of the Study:

  • To develop a miniature mass spectrometry (Mini MS) system equipped with a sampling probe for real-time chemical analysis of sample surfaces.
  • To demonstrate the system's capability in analyzing diverse compounds across various matrices.

Main Methods:

  • A novel miniature mass spectrometry system was designed and constructed.
  • A 1.5-meter sampling probe with dual channels (one for spray introduction, one for charged species transfer) was integrated with the Mini MS.
  • The system was tested for real-time analysis of various chemical compounds.

Main Results:

  • The developed Mini MS system successfully performed real-time chemical analysis directly from sample surfaces.
  • The system demonstrated efficacy in analyzing a range of compounds, including inks, agrochemicals, explosives, and animal tissues.
  • The probe's design facilitated efficient sample introduction and ion transfer to the mass spectrometer.

Conclusions:

  • The miniature mass spectrometry system with a sampling probe offers a viable solution for in-field, real-time chemical analysis of three-dimensional objects.
  • Potential applications include portable forensic analysis (e.g., backpack MS) and intrasurgical tissue analysis (e.g., compact MS with an intrasurgical probe).