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Related Concept Videos

Fixation and Sectioning01:03

Fixation and Sectioning

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Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Related Experiment Video

Updated: May 1, 2026

MALDI Sample Preparation: the Ultra Thin Layer Method
05:28

MALDI Sample Preparation: the Ultra Thin Layer Method

Published on: April 29, 2007

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MALDI sample preparation: the ultra thin layer method.

David Fenyo1, Qingjun Wang, Jeffrey A DeGrasse

  • 1Laboratory of Mass Spectrometry and Gaseous Ion Chemistry, Rockefeller University, USA. fenyo@rockefeller.edu

Journal of Visualized Experiments : Jove
|November 4, 2008
PubMed
Summary
This summary is machine-generated.

This study presents an ultra-thin layer method for Matrix-Assisted Laser Desorption Ionization Mass Spectrometry (MALDI-MS) analysis of proteins. This technique offers improved accuracy, resolution, and impurity tolerance for peptide and protein mass determination.

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MALDI Sample Preparation: the Ultra Thin Layer Method
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Sample Preparation for Metabolic Profiling using MALDI Mass Spectrometry Imaging
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Sample Preparation for Metabolic Profiling using MALDI Mass Spectrometry Imaging

Published on: December 22, 2020

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Matrix-Assisted Laser Desorption Ionization Mass Spectrometry (MALDI-MS) is a key technique for analyzing peptides and proteins.
  • Traditional sample preparation methods can be limited by impurities and resolution.
  • Accurate mass determination of proteins, especially membrane proteins, is crucial in biological research.

Purpose of the Study:

  • To demonstrate an optimized ultra-thin layer preparation method for MALDI-MS analysis of proteins.
  • To highlight the advantages of this method over conventional techniques like dried droplet.
  • To showcase its applicability for diverse protein types, including membrane and soluble proteins.

Main Methods:

  • Preparation of an ultra-thin matrix/analyte layer using alpha-cyano-4-hydroxycinnamic acid.
  • Utilizing a substrate layer of matrix crystals as a seeding ground for crystallization.
  • Application of the method to various proteins, including ion channels, transporters, receptors, and large soluble proteins up to 380 kDa.

Main Results:

  • The ultra-thin layer method provides greater tolerance to salts and detergents.
  • Achieved enhanced resolution and higher spatial uniformity in MALDI-MS spectra.
  • Successfully analyzed a wide range of proteins, demonstrating robustness and sensitivity.

Conclusions:

  • The ultra-thin layer method is a superior sample preparation technique for MALDI-MS protein analysis.
  • This protocol is highly effective for accurate mass determination of both membrane and soluble proteins.
  • The method is sensitive, robust, easy to implement, and yields high-quality spectra.