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Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

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Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Surface Tension, Capillary Action, and Viscosity02:57

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Capillary Electrophoresis: Applications01:30

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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Tandem Mass Spectrometry01:21

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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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Mass Spectrometry: Overview01:19

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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 electron 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 behind a...
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In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule; a molecule with an odd number of nitrogen atoms produces a molecular ion with an odd molecular weight. Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit strong molecular ion peaks, but acyclic...
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Sheathless Capillary Electrophoresis–Mass Spectrometry for Metabolic Profiling of Biological Samples
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Spatially Defined Surface Sampling Capillary Electrophoresis Mass Spectrometry.

Kyle D Duncan1, Ingela Lanekoff1

  • 1Department of Chemistry-BMC , Uppsala University , Uppsala 751 24 , Sweden.

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|May 25, 2019
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We developed a new surface sampling capillary electrophoresis mass spectrometry (SS-CE-MS) device for direct metabolite profiling from specific tissue regions. This innovation enables detailed chemical mapping of cellular areas in solid tissues for biological insights.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Molecular Biology

Background:

  • Capillary electrophoresis mass spectrometry (CE-MS) is vital for analyzing metabolites in biological samples.
  • Current CE-MS methods require liquid extracts, limiting spatial chemical information from tissues.
  • Understanding chemical profiles of distinct tissue regions is crucial for health and disease research.

Purpose of the Study:

  • To introduce the first CE-MS device for untargeted metabolite profiling directly from defined morphological regions of solid tissue sections.
  • To enable spatially resolved chemical analysis of endogenous molecules within tissues.

Main Methods:

  • Development of a novel surface sampling capillary electrophoresis mass spectrometry (SS-CE-MS) device.
  • Sampling and detection of endogenous molecules from single, defined tissue locations.
  • Characterization using A. Cepa epidermal layers, brain, spinal cord, and kidney tissues.

Main Results:

  • SS-CE-MS demonstrated reproducible relative migration times and a peak area relative standard deviation of 20% in A. Cepa.
  • Conserved relative migration times for endogenous metabolites across diverse tissues (brain, spinal cord, kidney).
  • Simultaneous analysis of small and large biomolecules, confident metabolite annotation, and identification of isomeric abundances in distinct morphological regions.

Conclusions:

  • SS-CE-MS is a groundbreaking tool for in-depth chemical profiling of distinct cellular regions in solid tissues.
  • This technique overcomes limitations of traditional CE-MS by enabling direct tissue analysis.
  • The technology promises to significantly advance biological understanding through detailed molecular mapping of tissue microenvironments.