Viral Particle Isolation
Viral Particle Isolation - 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
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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
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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.
14:59
Method for Measurement of Viral Fusion Kinetics at the Single Particle Level
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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.
05:51
Intracerebroventricular and Intravascular Injection of Viral Particles and Fluorescent Microbeads into the Neonatal Brain
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Cited by 18 •
2016
Here, we describe a simple method of intracerebroventricular and intravascular injection of viral particles or fluorescent microbeads into the neonatal mouse brain. The localization pattern of the virus and nanoparticles could be detected by microscopic evaluation or by in situ hybridization.
FAQs
Clarification and filtration remove cells, cellular debris, and other large contaminants before concentration. This preliminary cleanup reduces sample complexity and helps subsequent centrifugation, chromatography, or precipitation act on a more suitable mixture. By limiting unwanted material early, the workflow supports more reliable examination of particle structure, infectivity, genome content, and antigen expression.
Each method exploits a different physical or chemical property. Differential centrifugation separates components according to sedimentation behavior, while density-gradient centrifugation uses differences in density. Chromatography can separate particles through surface properties, and precipitation relies on solubility. Choosing among these approaches allows the workflow to match the characteristics of the sample and the desired particle preparation.
Buffer conditions, temperature, and handling practices all influence whether particles remain intact and biologically active. Careful control is important because structural damage or loss of activity can compromise downstream measurements. Maintaining suitable conditions throughout processing improves the reliability of analyses focused on virion structure, infectivity, genome content, or antigen expression.
A typical workflow begins by clarifying the sample and filtering it to remove cells and debris. The partially cleaned material is then concentrated using differential or density-gradient centrifugation, chromatography, or precipitation. The selected separation step depends on particle size, density, surface properties, or solubility, followed by controlled handling for downstream analysis.
Prepared particles can be examined for structural features, infectivity, genome content, and antigen expression. These measurements connect the physical properties of virions with their biological activity and immune visibility. The resulting information helps researchers investigate host-pathogen interactions, evaluate immune recognition, and assess how particle characteristics relate to infection studies.
In immunology, isolated particles provide material for studying antigen expression and immune recognition. In infection research, assessing infectivity and genome content helps characterize the biological properties of the virus. The same preparation step also supports vaccine development and antiviral testing, where consistent particle quality is important for interpreting experimental outcomes.