Maldi-tof Mass Spectrometry
Maldi-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.
13:29
Rapid Identification of Gram Negative Bacteria from Blood Culture Broth Using MALDI-TOF Mass Spectrometry
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Cited by 1 •
2014
The application of matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry (MS) directly to blood culture broth expedites the identification of bacteria. The presented method is a rapid and reliable method for identification of Gram negative bacteria directly from blood culture broth.
06:16
MALDI-ToF MS Method for the Characterization of Synthetic Polymers with Varying Dispersity and End Groups
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2025
This protocol provides detailed instructions and examples for sample preparation, data acquisition, and data analysis to characterize synthetic polymers with varying dispersity and end-groups using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry.
FAQs
The matrix absorbs the laser light used during analysis and helps the sample become gas-phase ions. This preparation step connects laser exposure with the production of detectable biomolecular ions, allowing proteins, peptides, lipids, and other molecules to enter the measurement process. Matrix-assisted preparation is therefore central to analyzing biological samples with this technique.
The instrument separates ions according to how their mass-to-charge ratios affect travel through the flight tube. Smaller ions, or ions carrying greater charge, reach the detector sooner than larger or less highly charged species. These differences in arrival time create measurements that support characterization of biomolecules in a complex sample.
Laser exposure acts on the light-absorbing matrix and sample mixture, producing ions that can travel through the instrument in the gas phase. The resulting ions are then distinguished by their flight behavior before detection. This sequence enables rapid analysis of biomolecular components without requiring the sample to be examined only in its original form.
MALDI-TOF mass spectrometry supports analysis of proteins, peptides, lipids, and other biomolecules. Examining their characteristic mass patterns enables biomolecular profiling and protein analysis, while also providing a way to study the composition of complex biological samples. The same measurement principle can therefore support several complementary biological research objectives.
A typical workflow mixes the biological sample with a light-absorbing matrix, exposes the mixture to a laser, and generates gas-phase ions. Those ions pass through a flight tube and reach a detector at times related to their mass-to-charge ratios. The resulting measurements can then be used to characterize biomolecules or compare mass patterns.
For microbial identification, the technique produces a characteristic mass pattern from a biological sample. That pattern can be compared with other characteristic patterns to support identification. This application is especially relevant to clinical microbiology, where the method's rapid measurements and ability to profile complex biological material provide useful identification information.
The method is useful when researchers need rapid characterization or profiling of biomolecules in complex biological samples. Applications described for biology include protein analysis, biomolecular profiling, microbial identification, clinical microbiology, and biotechnology. Its speed and sensitivity make it valuable across both research settings and applied biological analysis.