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Mass Spectrometry: Complex Analysis01:21

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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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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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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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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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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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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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Rapid Profiling and Real-Time Monitoring of Volatile Compounds Using a Low-Pressure Photoionization Source Combined

Hamna Qayyum1, Chunchun Lv1, Yaya Wang1

  • 1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China.

Journal of the American Society for Mass Spectrometry
|April 22, 2026
PubMed
Summary

Low-pressure photoionization coupled with orbitrap mass spectrometry (LPPI-MS) enables rapid analysis of volatile organic compounds (VOCs). This technique effectively profiles diverse samples like garlic, liquor, and apple for food quality and metabolic studies.

Keywords:
low-pressure photoionization mass spectrometrysemi-volatile organic compoundssoft ionizationvolatile organic compounds

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Untargeted Metabolomics from Biological Sources Using Ultraperformance Liquid Chromatography-High Resolution Mass Spectrometry UPLC-HRMS
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Area of Science:

  • Analytical Chemistry
  • Food Science
  • Metabolomics

Background:

  • Volatile organic compounds (VOCs) are crucial indicators of biological processes and food quality.
  • Accurate and rapid profiling of VOCs is essential for applications in food science and metabolic studies.
  • Traditional methods for VOC analysis can be time-consuming or lack sensitivity for complex matrices.

Purpose of the Study:

  • To evaluate the performance of a low-pressure photoionization source combined with an orbitrap mass spectrometer (LPPI-MS) for VOC profiling.
  • To demonstrate the applicability of LPPI-MS across chemically diverse biological samples, including garlic, Chinese liquors, and fresh-cut apples.
  • To showcase the method's capability for real-time aroma analysis in food quality control and metabolic investigations.

Main Methods:

  • Utilized a low-pressure photoionization (LPPI) source interfaced with an orbitrap mass spectrometer (MS).
  • Employed toluene as a dopant to enhance photoionization efficiency for challenging samples.
  • Analyzed diverse matrices: garlic, Chinese liquors, and fresh-cut apple, assessing volatile compound profiles.

Main Results:

  • Successfully detected characteristic sulfur-containing volatiles in garlic, including alk(en)yl sulfides and thiophenes.
  • Identified and differentiated fermentation-derived VOCs (alcohols, esters) in Chinese liquors.
  • Revealed aldehydes, alcohols, esters, and aromatics in fresh-cut apple, linked to tissue disruption pathways.

Conclusions:

  • LPPI-MS provides a robust, sensitive, and broadly applicable method for rapid VOC profiling.
  • The technique is suitable for analyzing complex biological and food matrices, aiding in quality control.
  • Demonstrated the potential of LPPI-MS for real-time metabolic studies and understanding aroma profiles.