Analyze large, complex and flexible structures without crystallization.
Obtain structural information from mere nanocrystals of compound.
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For compatibility with the electron microscope vacuum, and to lock the individual particles in their native state , the solution containing the sample material must be frozen. In order to preserve the macromolecular structures undamaged, freezing has to happen rapidly enough to avoid crystalline ice to occur, forming instead an amorphous solid that does little or no damage to the sample structure. Then the sample has to be kept at liquid nitrogen temperatures at all times to preserve the amorphous nature of the embedding ice layer, and again avoid damage to the biological particles.
This operation produces a frozen hydrated sample, where the individual molecules of the specimen are embedded in a very thin layer of amorphous (vitreous) ice and are well distributed within the ice.
The whole procedure can be simplified using semi-automated plungers such as the Thermo Scientific Vitrobot™. Based on a set of key parameters, such as specimen blotting time, blotting force, relative humidity, and temperature, this allows for reproducible preparation of vitrified specimens at high quality.
Learn more about Sample vitrification in the single particle analysis workflow.
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