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Related Concept Videos

Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

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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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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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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 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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Updated: May 8, 2025

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow
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Categorizing Concentration Confidence: A Framework for Reporting Concentration Measures from Mass Spectrometry-Based

Lauren M Petrick1,2, David Achaintre1,2, Amith Maroli1,2

  • 1Department of Environmental Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA.

Environmental Health Perspectives
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Summary

A new 5-level scheme helps report analyte concentrations from mass spectrometry assays. This framework clarifies measurement uncertainty, improving data interpretation and cross-study comparisons for targeted, untargeted, and hybrid assays.

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Area of Science:

  • Analytical Chemistry
  • Biomarker Discovery
  • Metabolomics

Background:

  • Mass spectrometry innovations blur lines between targeted (quantitative) and untargeted (discovery) biospecimen assays.
  • Both assay types generate data, but only concentration values allow inter-study comparisons and threshold development.
  • Hybrid assays offer discovery and quantitation but with potentially higher uncertainty and no standard reporting guidelines.

Purpose of the Study:

  • To propose a unified scheme for reporting analyte measurement assurance across quantitative, untargeted, and hybrid assays.
  • To enable consistent reporting of concentration confidence levels for improved data interpretation and comparability.

Main Methods:

  • A 5-level reporting scheme is proposed for analyte concentrations.
  • Level 1 represents confirmed concentrations from fully quantitative assays.
  • Level 5 represents tentative intensity values from untargeted assays.

Main Results:

  • The proposed scheme provides a simple framework for reporting concentrations with varying degrees of uncertainty.
  • This facilitates clear communication of measurement confidence across different assay types.
  • The framework supports cross-validation, meta-analysis, and extrapolation of data from diverse studies.

Conclusions:

  • The 5-level scheme enhances clarity and conciseness in reporting bioassay concentrations.
  • It aids in the interpretation of data from targeted, untargeted, and hybrid mass spectrometry assays.
  • This standardized approach supports analytical advancement and reliable risk assessment.