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Related Concept Videos

Mass Analyzers: Overview01:13

Mass Analyzers: Overview

2.0K
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 Spectrometry: Overview01:19

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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 electron 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 behind a...
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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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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 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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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 Single Cell Mass Spectrometry Metabolomics Studies: Combined Cell Washing, Quenching, Drying, and Storage
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Power Normalization for Mass Spectrometry Data Analysis and Analytical Method Assessment.

Y Melodie Du1, Ye Hu2, Yu Xia3

  • 1Weldon School of Biomedical Engineering, Purdue University , 206 South Martin Jischke Drive, West Lafayette, Indiana 47907, United States.

Analytical Chemistry
|February 17, 2016
PubMed
Summary
This summary is machine-generated.

Power nomination enhances mass spectrometry data analysis for improved sample classification. This method, combined with support vector machine (SVM), accurately distinguishes between different biological samples in various studies.

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Area of Science:

  • Biochemistry
  • Computational Biology
  • Analytical Chemistry

Background:

  • Mass spectrometry is crucial for biomarker profiling and sample classification in biological research.
  • Effective data analysis is essential for accurate classification based on mass spectrometry data.

Purpose of the Study:

  • To introduce and evaluate "power nomination" as a novel method for mass spectra data analysis.
  • To assess the impact of power nomination on sample classification when combined with support vector machine (SVM).

Main Methods:

  • Power nomination was used to systematically alter peak weights in mass spectra.
  • Support vector machine (SVM) was employed for sample classification.
  • Data from four diverse studies (sugar anomeric configurations, bacteria types, melanoma stages, breast cancer types) were analyzed.

Main Results:

  • The study characterized the impact of power nomination on sample classification across multiple datasets.
  • Normalization using different power normalization index (PNI) values was comprehensively analyzed.
  • Analysis tools like error-PNI plots were developed to assess method potential and optimize classification.

Conclusions:

  • Power nomination, in conjunction with SVM, offers a robust approach for mass spectrometry-based sample classification.
  • The developed analytical tools aid in assessing method performance and identifying optimal classification strategies.
  • This method shows promise for improving accuracy in diverse biological and clinical applications.