Mass Spectrometry Identification
Mass Spectrometry Identification - Related Videos
07:09
Tandem Mass Spectrometry
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2023
In tandem mass spectrometry a biomolecule of interest is isolated from a biological sample, and then fragmented into multiple subunits in order to help elucidate its composition and sequence. This is accomplished by having mass spectrometers in series. The first spectrometer ionizes a sample and filter ions of a specific mass to charge ratio. Filtered ions are then fragmented and passed to a second mass spectrometer where the fragments are analyzed. This video introduces the principles of...
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...
10:52
Sample Preparation for Mass Spectrometry-based Identification of RNA-binding Regions
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Cited by 1 •
2017
We describe a protocol to identify RNA-binding proteins and map their RNA-binding regions in live cells using UV-mediated photocrosslinking and mass spectrometry.
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...
01:33
Peptide Identification Using Tandem Mass Spectrometry
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2023
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...
FAQs
Ionization converts molecules from the sample into gas-phase ions, making them measurable by the instrument. This step allows the analysis to distinguish molecules according to their mass-to-charge ratios. Because biological samples contain many molecular species, producing detectable ions is essential for examining proteins, peptides, metabolites, lipids, and other biomolecules within complex mixtures.
Mass-to-charge ratios provide the measurements used to separate ionized molecules during analysis. Differences in these ratios help distinguish molecular species that occur together in a biological sample. The resulting measurements supply molecular-level information about sample composition, allowing researchers to examine which biomolecules are present and how that composition may differ between biological conditions.
Fragmentation produces characteristic patterns from selected ionized molecules. These patterns add structural information that a measurement of the intact molecule alone may not provide. Researchers can compare the resulting patterns with reference spectra or databases, strengthening the identification of proteins, peptides, metabolites, lipids, and other molecules in a complex biological sample.
The analysis proceeds by converting compounds into gas-phase ions, separating those ions according to their mass-to-charge ratios, and, when appropriate, fragmenting them to generate characteristic patterns. Researchers then compare the measured patterns with reference spectra or databases. Together, these stages connect the instrument’s measurements with molecular identities and biological interpretation.
Researchers apply the technique when they need molecular-level evidence about the composition of biological samples or changes within them. Its uses include protein characterization, biomarker research, metabolic studies, and investigation of cellular pathways. The approach is especially relevant when several classes of biomolecules, such as proteins, metabolites, and lipids, must be examined.
The method can support identification and characterization of proteins and peptides, as well as analysis of metabolites, lipids, and other biomolecules. By revealing molecular composition and changes in that composition, it contributes to studies of biomarkers, metabolism, and cellular pathways. These outcomes help connect observed biological changes with specific molecular components.