Controlled Freezing Lyophilization
Controlled Freezing Lyophilization - Related Videos
11:14
Mass Spectrometric Approaches to Study Protein Structure and Interactions in Lyophilized Powders
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Cited by 19 •
2015
Here, we present detailed protocols for solid-state amide hydrogen/deuterium exchange mass spectrometry (ssHDX-MS) and solid-state photolytic labeling mass spectrometry (ssPL-MS) for proteins in solid powders. The methods provide high-resolution information on protein conformation and interactions in the amorphous solid-state, which may be useful in formulation design.
02:31
Extracellular Matrix-derived Foam Fabrication via Lyophilization: A Procedure to Generate Biological Scaffolds from ECM of Decellularized Tissues
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2023
This video describes the method for synthesizing pure ECM-derived foams without the need for chemical crosslinking. These ECM-derived foams find applications as advanced 3D in vitro cell culture models or as pro-regenerative bioscaffolds.
11:17
Fundamental Technical Elements of Freeze-fracture/Freeze-etch in Biological Electron Microscopy
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Cited by 6 •
2014
Basic techniques and refinements of freeze-fracture processing of biological specimens and nanomaterials for examination by transmission electron microscopy are described. This technique is a preferred method for revealing ultrastructural features and specializations of biological membranes and for obtaining ultrastructural level dimensional and spatial data in materials sciences and nanotechnology products.
07:27
The Development of Lyophilized Loop-mediated Isothermal Amplification Reagents for the Detection of Coxiella burnetii
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Cited by 7 •
2016
We described here a simple loop-mediated isothermal amplification (LAMP) method using lyophilized reagents for the detection of C. burnetii in patient samples.
03:12
Freezing Point Depression and Boiling Point Elevation
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2020
Boiling Point Elevation The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
FAQs
Controlled cooling establishes the frozen state before water removal begins. The frozen structure then serves as the starting condition for primary drying, when ice sublimes under reduced pressure. Because temperature regulation helps limit structural damage, the cooling stage is important for preserving the structure and activity of sensitive biological materials throughout processing.
Primary drying targets the ice formed during freezing. Under reduced pressure, that ice sublimes, meaning it changes directly from solid to vapor. Secondary drying follows by removing residual bound moisture that remains after ice has been removed. Separating these stages addresses different forms of water and supports preservation of product quality.
Coordinated control of temperature and pressure helps limit structural damage while water is removed. Reduced pressure enables ice sublimation during primary drying, while temperature regulation governs the conditions experienced by the frozen material. Balancing these variables supports formation of a dry product that retains the properties needed for later reconstitution and use.
A typical workflow begins with controlled cooling to freeze the material, followed by primary drying under reduced pressure to remove ice through sublimation. Secondary drying then removes residual bound moisture. These sequential stages convert a frozen biological product into a dry form while maintaining conditions intended to protect its structure and activity.
The approach can support stabilization of proteins, vaccines, cells, biomaterials, and other therapeutics that may degrade in liquid formulations. Its value differs across these products, but the common objective is to preserve properties needed for storage and later use. This makes the process relevant to multiple areas of bioengineering product development.
A successfully processed product may offer improved shelf life and greater transport stability than a liquid formulation. The dry state is useful only if important biological properties remain available for later reconstitution and use. Consequently, evaluation focuses not just on water removal, but also on whether the preserved material retains its required structure and activity.