Viral Particle Precipitation
Viral Particle Precipitation - Related Videos
02:41
Concentration and Purification of Viral Particles
0 Views •
2026
Source: Fricano-Kugler, C. J., et al. Designing, Packaging, and Delivery of High Titer CRISPR Retro and Lentiviruses via Stereotaxic Injection. J. Vis. Exp. (2016).This video demonstrates the step-by-step process for concentrating and purifying lentiviral particles from a mixed suspension containing host cell debris. The procedure utilizes centrifugation, filtration, and PEG-salt precipitation to isolate viral particles while removing soluble impurities. The final product is resuspended in a...
02:36
In Vitro Reconstitution and Purification of Viral Nucleocapsid-Like Particles
0 Views •
2026
Source: Gao, Y., et al. Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus. J. Vis. Exp. (2021)The video demonstrates the in vitro assembly of virus-specific nucleocapsids from a purified RNA-free nucleoprotein–phosphoprotein complex, their purification by size exclusion chromatography, and validation of full-length viral RNA within the assembled particles.
01:55
Generation of Recombinant Viral Particles Using Embryonic Kidney Cells
0 Views •
2026
Source: Vijayraghavan, S., 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 the procedure for generating recombinant viral particles by transfecting embryonic kidney cells with plasmids encoding viral proteins and a gene of interest.
01:16
Precipitate Formation and Particle Size Control
0 Views •
2024
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species. The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
14:59
Method for Measurement of Viral Fusion Kinetics at the Single Particle Level
0 Views •
Cited by 11 •
2009
We present an in vitro, two-color fluorescence assay to visualize the fusion of single virus particles with a fluid target bilayer. By labeling viral particles with fluorophores that differentially stain the viral membrane and its interior, we are able to monitor the kinetics of hemifusion and pore formation.
FAQs
Precipitation occurs when polyethylene glycol, salts, or another precipitating agent reduces particle solubility by changing the solution’s ionic strength and water availability. These altered conditions encourage viral particles to aggregate rather than remain dispersed. Once aggregated, the particles become sufficiently recoverable for separation by centrifugation or filtration, enabling concentration from the original fluid.
Polyethylene glycol and salts promote recovery through related but distinct solution effects. They modify the chemical environment surrounding viral particles, including ionic strength and the availability of water, which reduces solubility and favors aggregation. The selected precipitating agent therefore influences whether particles form a recoverable pellet or remain dispersed, making controlled solution conditions important.
Viral particle precipitation primarily provides an initial concentration and recovery step by reducing solubility and collecting aggregated particles. Chromatography is a higher-resolution purification method used later in the workflow. This distinction allows precipitation to handle relatively large volumes with simple equipment before chromatography separates or refines the concentrated material more selectively.
A typical workflow begins with a biological fluid, followed by addition of polyethylene glycol, salts, or another precipitating agent. The solution is then maintained under controlled conditions so viral particles aggregate. The resulting material is recovered as a pellet through centrifugation or collected by filtration, after which it can proceed to downstream analysis or purification.
The approach can process relatively large volumes while relying on simple equipment, which makes it practical as an early concentration step. Instead of immediately applying a dilute sample to a higher-resolution purification system, researchers first reduce its volume and recover viral material. This preparation can make subsequent purification, recovery, or molecular analysis more manageable.
Concentrated viral particles can support downstream molecular analysis, vaccine development, gene delivery research, and bioprocessing. In each setting, precipitation helps recover virus material from biological fluids before additional processing. Its value lies in providing a concentration step that can feed later purification workflows or supply material for studies involving viral particles and their applications.