Cryoprotection Sucrose
Cryoprotection Sucrose - Related Videos
11:00
Liquid Phase Reactor: Sucrose Inversion
0 Views •
2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Both batch and continuous flow reactors are used in catalytic reactions. Packed beds, which use solid catalysts and a continuous flow, are the most common configuration. In the absence of an extensive recycle stream, such packed bed reactors are typically modeled as "plug flow". The other most common continuous reactor is a stirred tank, which is assumed to be perfectly...
03:36
Purification of Bacteriophages Using a Sucrose Density Gradient
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2026
Source: Rustad, M., et.al. Synthesis of Infectious Bacteriophages in an E. coli-based Cell-free Expression System. J. Vis. Exp. (2017)This video demonstrates the purification of bacteriophages from a suspension containing host bacterial debris using a sucrose density gradient. It shows how the density gradient separates phages by buoyant density, enabling recovery of a visible band for resuspension and further analysis.
12:44
A General Method for Evaluating Incubation of Sucrose Craving in Rats
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Cited by 25 •
2011
Responding for food or drug-paired cues increases over the course of a period of abstinence and this may relate to an increased susceptibility to relapse behaviors. Here we detail a procedure for evaluating this "incubation of craving" in rats that have self-administered sucrose.
03:39
Preparation of Virus-Enriched Suspension Using Stepwise Sucrose Centrifugation
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2026
Source: Vijayraghavan, S. and Kantor, B. A Protocol for the Production of Integrase-deficient Lentiviral Vectors for CRISPR/Cas9-mediated Gene Knockout in Dividing Cells. J. Vis. Exp., (2017)This video demonstrates a two-step ultracentrifugation method using sucrose gradients and cushions to purify and concentrate viral particles from cell culture supernatant. The procedure enables separation based on buoyant density, allowing recovery of intact virus suitable for downstream applications.
08:30
Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
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Cited by 43 •
2011
A method to prepare translationally active, intact synaptoneurosomes (SNs) from mouse brain cortex is described. The method uses a discontinuous Percoll-sucrose density gradient allowing for the quick preparation of active SNs.
FAQs
Sucrose acts outside the cell, where it raises extracellular osmotic pressure and shifts water away from the cellular environment. That reduction in available water helps limit ice-crystal formation during freezing. Because the effect is nonpenetrating, the protective action depends on the surrounding solution rather than sucrose entering the cell.
Concentration determines the osmotic pressure generated around the biological material and therefore influences how much water is drawn away from cells. It also affects the extent of dehydration and the resulting protection against freezing damage. For this reason, sucrose-based formulations must be considered in relation to sample type and the selected cooling and thawing conditions.
During dehydration, sucrose can replace some hydration interactions normally associated with water. This supports the structural stability of membranes and proteins while the sample contains less available water. The mechanism is important because freezing damage is not limited to ice formation; changes in hydration can also affect the integrity of cellular and molecular components.
Sucrose does not act independently of the thermal procedure. The effectiveness of a sucrose-based solution depends on the cooling rate and on controlled thawing conditions, which influence the stresses experienced by cells, tissues, or biomolecules. Consequently, evaluating the solution requires considering both its composition and the way the sample is frozen and subsequently thawed.
A basic workflow places the biological material in a sucrose-based cryoprotective solution, applies an appropriate cooling process, stores the frozen sample, and then uses controlled thawing before analysis or recovery. The specific concentration, cooling rate, and thawing conditions should be matched to the sample because these variables influence the preservation outcome.
The approach can support preservation of cells, tissues, and biomolecules, although the relevant conditions may differ among these sample types. Cells may require protection of membranes, tissues may require preservation throughout their structure, and biomolecules may require maintenance of protein stability. Identifying the material helps guide formulation and handling decisions.
Sucrose-based solutions are useful when biological specimens must remain sufficiently preserved for later microscopy or biochemical analysis. Cryoprotection can be incorporated into sample preparation or storage so that freezing-related damage is reduced before examination. The resulting value depends on maintaining suitable concentration, cooling, and thawing conditions for the specimen being studied.