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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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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 low-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.
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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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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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SpectraX: A Straightforward Tool for Principal Component Analysis-Based Spectral Analysis.

Jian Yu1, Haidy Metwally1, Jennifer Kolwich1

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

Journal of the American Society for Mass Spectrometry
|January 13, 2024
PubMed
Summary
This summary is machine-generated.

SpectraX is a new MATLAB application that automates mass spectrometry (MS) spectral analysis for natural product screening. It improves throughput and reliability in identifying mass-to-charge (m/z) features from complex data.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Computational Biology

Background:

  • Direct/ambient mass spectrometry (MS) is crucial for natural product screening.
  • Manual spectral screening limits throughput and reliability in large-scale data analysis.
  • Existing methods often lack automated spectral analysis capabilities.

Purpose of the Study:

  • To develop an automated application for analyzing complex mass spectrometry spectra.
  • To enhance the efficiency and accuracy of natural product screening.
  • To provide a tool for quick identification of mass-to-charge (m/z) features.

Main Methods:

  • Development of SpectraX, a MATLAB-based application.
  • Utilizing Principal Component Analysis (PCA) for data set analysis.
  • Algorithm designed to identify m/z features for natural product identification.

Main Results:

  • SpectraX enables rapid analysis of mass spectrometry spectra.
  • The application effectively locates m/z features within complex data.
  • PCA scoring plots aid in data clustering and interpretation.

Conclusions:

  • SpectraX offers an automated solution for spectral screening in MS.
  • The tool significantly improves throughput and reliability for natural product discovery.
  • Automated analysis using SpectraX facilitates faster research in metabolomics and proteomics.