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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.
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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.
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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 mass spectrometry sensitivity for single-cell proteomics (SCP). This breakthrough enables reliable quantification of low-abundance proteins, overcoming a key analytical bottleneck in ultrasensitive SCP applications.

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    Area of Science:

    • Proteomics and Mass Spectrometry
    • Cellular Biology and Heterogeneity
    • Analytical Chemistry and Instrumentation

    Background:

    • Single-cell proteomics (SCP) offers high-resolution insights into cellular heterogeneity but faces sensitivity limitations due to extremely low protein content.
    • Targeted quantification using selected reaction monitoring (SRM) on triple quadrupole (QqQ) instruments is sensitive but struggles with low-abundance proteins in single-cell samples.
    • Current mass spectrometry instrumentation requires enhanced sensitivity to analyze the femtogram to picogram levels of protein in individual cells.

    Purpose of the Study:

    • To develop and evaluate a novel dual ion funnel interface to enhance ion transmission efficiency in commercial QqQ mass spectrometers.
    • To address the critical analytical bottleneck in quantitative targeted single-cell proteomics.
    • To improve sensitivity and reproducibility for analyzing low-abundance proteins in single-cell samples.

    Main Methods:

    • Development of a dual ion funnel interface comprising a curved S-funnel and a conventional ion funnel.
    • Systematic performance comparison of the dual ion funnel interface against a standard interface on a TSQ Vantage mass spectrometry platform.
    • Evaluation across biological samples of varying complexity, including mouse macrophages and human cells.

    Main Results:

    • The dual ion funnel interface achieved up to a 25-fold improvement in sensitivity across diverse protein concentrations and biological matrices.
    • Enhanced sensitivity was correlated with increased analytical reproducibility, evidenced by lower coefficients of variation.
    • Reliable quantification of previously undetectable low-abundance proteins was enabled, extending analysis to single-cell equivalent amounts.

    Conclusions:

    • The dual ion funnel interface effectively overcomes the sensitivity limitations in quantitative targeted proteomics for single-cell analysis.
    • This technological advancement provides a foundation for ultrasensitive targeted single-cell proteomics requiring high sensitivity and robust quantitative performance.
    • The developed interface significantly enhances ion transmission and reduces chemical noise, paving the way for deeper biological insights from single cells.