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Related Concept Videos

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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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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Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
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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 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 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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Enhancing Sensitivity in Targeted Single-Cell Proteomics by Coupling a Dual Ion Funnel Interface with Triple

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A new dual ion funnel interface significantly boosts sensitivity for single-cell proteomics (SCP) using mass spectrometry. This breakthrough enables reliable quantification of low-abundance proteins, overcoming a major bottleneck in ultrasensitive cellular analysis.

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Cellular Biology

Background:

  • Single-cell proteomics (SCP) offers high-resolution insights into cellular heterogeneity.
  • Limited protein content in single cells challenges mass spectrometry sensitivity.
  • Selected reaction monitoring (SRM) on triple quadrupole (QqQ) instruments has sensitivity limitations for low-abundance proteins in single-cell samples.

Purpose of the Study:

  • To develop and evaluate a novel dual ion funnel interface for enhanced sensitivity in quantitative targeted proteomics.
  • To address the analytical bottleneck in single-cell proteomics by improving ion transmission efficiency.
  • To enable reliable quantification of low-abundance proteins in single-cell equivalent samples.

Main Methods:

  • Development of a dual ion funnel interface (curved S-funnel followed by a conventional ion funnel).
  • Systematic evaluation of the dual ion funnel interface on a TSQ Vantage mass spectrometry platform.
  • Comparison of performance across biological matrices with varying complexity (mouse macrophages, human cells).

Main Results:

  • The dual ion funnel interface achieved up to a 25-fold improvement in sensitivity.
  • Enhanced sensitivity was correlated with increased analytical reproducibility (lower coefficient of variation).
  • Reliable quantification of previously undetectable low-abundance proteins was achieved at single-cell equivalent levels.

Conclusions:

  • The dual ion funnel interface effectively overcomes sensitivity limitations in quantitative targeted proteomics.
  • This technology provides a foundation for ultrasensitive targeted single-cell proteomics.
  • The interface enables robust quantitative performance essential for advanced SCP applications.