Related Experiment Video
Updated: Jun 17, 2025
15:35
Analyzing Large Protein Complexes by Structural Mass Spectrometry
Published on: June 19, 2010
24.2K
Realization of Higher Resolution Charge Detection Mass Spectrometry
David W Reitenbach1, Daniel Y Botamanenko2, Lohra M Miller2
1Chemistry Department, Indiana University, Bloomington, Indiana 47405, United States.
Analytical Chemistry
|August 14, 2024
Summary
Charge detection mass spectrometry (CD-MS) achieved over 14,600 resolving power, a 20-fold improvement. This advancement enables detailed analysis of complex biological molecules like proteins and viral capsids.
Area of Science:
- Analytical Chemistry
- Biophysics
- Mass Spectrometry
Background:
- Conventional mass spectrometry (MS) struggles with heterogeneous samples.
- Charge detection mass spectrometry (CD-MS) measures m/z and charge for individual ions.
- Mass resolution in CD-MS is limited by imprecision in m/z and charge measurements.
Purpose of the Study:
- To significantly enhance the resolving power of CD-MS.
- To optimize electrostatic linear ion trap (ELIT) parameters for improved mass resolution.
- To demonstrate the application of high-resolution CD-MS for complex biological analyses.
Main Methods:
- Utilized trajectory simulations to optimize ELIT geometry and electrostatic potentials.
- Identified and operated at conditions minimizing energy dependence of ion oscillation frequency.
- Employed a beam collimator to achieve maximum resolving power.
Main Results:
- Achieved a CD-MS resolving power exceeding 14,600, a 20-fold increase over previous records.
- Demonstrated resolving power of 7300 without a collimator, still an order of magnitude improvement.
- Successfully resolved isotope distributions for peptides and proteins.
- Applied high-resolution CD-MS to analyze glycans on monoclonal antibodies and hepatitis B virus capsids.
Conclusions:
- Optimized ELIT design dramatically improves CD-MS resolving power.
- High-resolution CD-MS is a powerful tool for analyzing complex biomolecules.
- Adduct removal strategies require refinement for optimal analysis of high-mass species.
More Related Videos
Related Concept Videos
01:13Mass Analyzers: Overview
620
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...
620
01:15High-Resolution Mass Spectrometry (HRMS)
1.3K
The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
1.3K
01:19Mass Analyzers: Common Types
582
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...
582
01:16Mass Spectrometers
5.3K
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:
5.3K
01:21Mass Spectrometry: Complex Analysis
737
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...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
737
01:19Mass Spectrometry: Overview
4.7K
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 electrospray 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...
4.7K