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Related Concept Videos

Fixation and Sectioning01:03

Fixation and Sectioning

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...
Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

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...
Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
Bulk or large solid samples are typically reduced in size using grinding, crushing, or milling techniques to increase the...
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...

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Related Experiment Video

Updated: Jun 2, 2026

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

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Metal Organic Layers-Based Sample Preparation Method for Membrane Proteome Analysis.

Jiang Qianqian1,2, Jiang Bo3, Zhang Yukui1

  • 1State Key Laboratory of Medical Proteomics, National Chromatographic R. & A. Center, CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.

Methods in Molecular Biology (Clifton, N.J.)
|April 30, 2025
PubMed
Summary

We developed a novel metal-organic layer (MOL) method for membrane proteome analysis. This approach simplifies the study of membrane proteins, crucial for understanding diseases and developing precision medicine.

Keywords:
EnrichmentMass spectrometryMembrane proteomeMetal organic layersbased identification

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Area of Science:

  • Proteomics
  • Cell Biology
  • Materials Science

Background:

  • Membrane proteome mapping is vital for understanding disease pathophysiology and developing precision medicine.
  • Identifying membrane proteins is challenging due to their hydrophobicity and low abundance.
  • Current mass spectrometry methods face limitations in membrane protein analysis.

Purpose of the Study:

  • To introduce a novel metal-organic layer (MOL)-based sample preparation method for membrane proteome analysis.
  • To provide a robust and specific tool for dissecting the membrane proteome in living cells.
  • To detail the preparation of MOLs and the enrichment workflow for HeLa membrane proteins.

Main Methods:

  • Cell surface engineering using metal-organic layers (MOLs).
  • Exploiting the interaction between MOLs and phospholipid bilayers.
  • Utilizing a biomembrane fusion process for sample preparation.
  • Developing an enrichment workflow for membrane proteins.

Main Results:

  • Demonstrated a simple and robust method for membrane proteome analysis.
  • Achieved high specificity in membrane protein dissection.
  • Successfully applied the method to HeLa membrane proteins.

Conclusions:

  • The MOL-based method offers a significant advancement in membrane proteome analysis.
  • This technique facilitates the study of membrane proteins for disease research and drug discovery.
  • The described workflow provides a valuable tool for researchers in proteomics and cell biology.