Q-tof Mass Spectrometry
Q-tof Mass Spectrometry - Related Videos
07:27
MALDI-TOF Mass Spectrometry
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2023
Matrix-assisted laser desorption ionization (MALDI) is a mass spectrometry ion source ideal for the analysis of biomolecules. Instead of ionizing compounds in the gaseous state, samples are embedded in a matrix, which is struck by a laser. The matrix absorbs the majority of the energy; some of this energy is then transferred to the sample, which ionizes as a result. Sample ions can then be identified using a time-of-flight analyzer (TOF). This video covers principles of MALDI-TOF, including...
01:19
MALDI-TOF Mass Spectrometry
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2025
Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
11:25
Whole-cell MALDI-TOF Mass Spectrometry is an Accurate and Rapid Method to Analyze Different Modes of Macrophage Activation
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Cited by 11 •
2013
This protocol describes the use of whole-cell MALDI-TOF mass spectrometry on eukaryotic cells. Here, we illustrate the accuracy of this technique by analyzing the multiple activation states of macrophages in response to their microenvironment.
13:45
Introduction to Mass Spectrometry
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2023
Source: Laboratory of Dr. Khuloud Al-Jamal - King's College London Mass spectrometry is an analytical chemistry technique that enables the identification of unknown compounds within a sample, the quantification of known materials, the determination of the structure, and chemical properties of different molecules. A mass spectrometer is composed of an ionization source, an analyzer, and a detector. The process involves the ionization of chemical compounds to generate ions. When using...
07:15
Amide Hydrogen/Deuterium Exchange & MALDI-TOF Mass Spectrometry Analysis of Pak2 Activation
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Cited by 2 •
2011
MALDI-TOF mass spectrometry was successfully utilized to monitor the amide hydrogen/deuterium exchange in protein kinase Pak2 activation.
FAQs
The quadrupole manages ion transmission by filtering or selecting ions before they enter the time-of-flight analyzer. This stage helps control which portions of a complex ion population proceed to measurement. By narrowing or directing the ions examined, the instrument can support targeted mass analysis as well as characterization of components within biologically complex samples.
After ions pass through the quadrupole, the time-of-flight analyzer measures how long they require to reach the detector. These flight times are used to determine their mass-to-charge ratios. The resulting measurements provide accurate-mass information, which supports molecular identification and helps distinguish analytes present in complex biological mixtures.
Fragmentation adds structural information beyond the mass-to-charge measurement of an intact ion. In tandem mass spectrometry, selected ions are broken into product ions whose measurements can help characterize the original molecule. This capability is particularly useful when researchers need to investigate molecular identity or structure rather than only detect a mass signal.
High-resolution measurement provides accurate mass-to-charge values for ions in samples containing many molecular components. That precision supports molecular identification when several analytes contribute signals to the same biological sample. Consequently, Q-TOF mass spectrometry can characterize complex mixtures in applications where a simple detection of molecular presence would provide insufficient information.
A biological sample is introduced for ion measurement, the quadrupole filters or selects ions for transmission, and the time-of-flight analyzer records their arrival times at the detector. The instrument converts these measurements into mass-to-charge information. If structural characterization is needed, fragmentation and tandem analysis add information from the resulting product ions.
Q-TOF mass spectrometry supports several major areas of biology, including proteomics, metabolomics, lipid analysis, and biomarker research. In these settings, researchers can use accurate-mass measurements to identify molecules and characterize complex mixtures. Fragmentation further supports structural investigation, making the approach useful when biological studies require more than a basic molecular signal.
The technique can provide accurate mass-to-charge measurements for molecular identification, while tandem mass spectrometry can contribute structural information through fragmentation. Together, these outcomes help researchers characterize molecules in complex biological samples. The information is relevant to studies that compare or investigate proteins, metabolites, lipids, or potential biomarkers within biological systems.