Cryogenic Transmission Electron Microscopy (Cryo-TEM)

Introduction to Cryo-TEM

Cryo-TEM has emerged as a powerful technique for visualizing biological macromolecules and novel high-resolution materials under cryogenic conditions. First created to determine the high-resolution structures of biomolecules in solution, Cryo-TEM has found applications in various fields, including material sciences. Movement is arrested by rapidly cooling samples to cryogenic temperatures, allowing for the observation of biomolecules in their native hydrated states. This technique has revolutionized structural biology and is increasingly adopted in other industries dealing with innovative materials. MaTestLab is one of the leading testing services providers in the USA and Canada. We have an extensive network of testing laboratories in the USA.

Principle and Methodology of Cryo-TEM

The principle behind cryo-TEM involves using a focused, high-energy electron beam transmitted through a thin sample under cryogenic conditions. The sample, typically 50-100 nm thick, is prepared by rapid cooling to cryogenic temperatures using a cryogen such as liquid ethane. This prevents water crystallization, retaining it in an amorphous form known as vitreous water. The sample is then exposed to the high-energy electron beam, and the transmitted electrons are captured to produce highly magnified images on a fluorescent screen or digital imaging system.

Cryo-TEM enables the visualization of sensitive biomolecules in their native states without staining or fixation, thereby preserving their structure and function. The use of cryogenic temperatures also helps prevent radiation damage that may occur due to the high-energy electron beam. In addition to its applications in structural biology, Cryo-TEM is being increasingly utilized in material sciences for studying soft polymers, nano-crystals, and other novel materials.

Cryo-TEM is a valuable research tool in various biological fields, providing insights into the structural organization of biomolecules and their interactions. Moreover, its versatility and applicability to diverse sample types make it an indispensable technique in academic research and industrial applications.

Instrumentation

Cryo-TEM reveals biological samples at the nanoscale level with the help of advanced equipment. It consists of a monitoring system, imaging software, an environmental control system, a sample preparation system, an electron microscope, a cryo-holder, and an environmental control system. A concentrated electron beam is produced by the electron microscope, and the sample is kept at cryogenic temperatures in the cryo-holder. While the imaging software maintains image stability and manages settings, the sample preparation system makes sample administration and freezing easier. 

Common Applications of Cryo-TEM

• Molecular biology, biotechnology, and zoology research
• Investigating and creating next-generation soft polymers
• Investigations into the architecture of proteins
• Investigations of macromolecule complexes, organelles, and cell structure
• Research on nanocrystals

Cryo-TEM in Industrial Applications

• Research and development instruments for next-generation soft polymer materials, biology, and medicine

Benefits of Cryo-TEM

• It is possible to study biomolecules in their naturally hydrated form.
• Reduces radiation damage to delicate materials
• Needs minuscule samples

Cryogenic Transmission Electron Microscopy’s (Cryo-TEM) limitations

• Lack of contrast due to meager signal-to-noise ratio, particularly when studying biological macromolecules
• The process of mounting and preparing samples takes time.

Related Techniques

Cryo-TEM has been supported by several methods for the analysis of biological components, which includes

• Single-Particle Cryo-Electron Microscopy (Cryo-SP-EM)
• Cryo-Electron Tomography (Cryo-ET)