Viral Purity
Viral Purity - Related Videos
12:17
Detection and Isolation of Apoptotic Bodies to High Purity
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Cited by 29 •
2018
A workflow using flow cytometry or differential centrifugation is developed to detect, quantify and isolate apoptotic bodies from an apoptotic sample to high purity.
12:06
Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
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Cited by 6 •
2017
A protocol for the synthesis of high purity nonsymmetric dialkylphosphinic acid extractants is presented, taking (2,3-dimethylbutyl)(2,4,4'-trimethylpentyl)phosphinic acid as an example.
14:04
Viral Nanoparticles for In vivo Tumor Imaging
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Cited by 45 •
2012
Plant viral nanoparticles (VNPs) are promising platforms for applications in biomedicine. Here, we describe the procedures for plant VNP propagation, purification, characterization, and bioconjugation. Finally, we show the application of VNPs for tumor homing and imaging using a mouse xenograft model and fluorescence imaging.
12:45
Preparation of Viral DNA from Nucleocapsids
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Cited by 40 •
2011
We describe the process of isolating high purity herpesvirus nucleocapsid DNA from infected cells. The final DNA captured from solution is of high concentration and purity, making it ideally suited for high-throughput sequencing, high fidelity PCR reactions, and transfections to produce new viral recombinants.
00:57
Viral Recombination
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2019
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment. Viral Recombination Can Create New Diseases Some diseases can infect multiple species. For example, pigs can be infected by some human and...
FAQs
A complete assessment considers several impurity classes rather than a single contaminant. Host-cell proteins and DNA, endotoxins, residual process reagents, aggregates, and unwanted viral or microbial agents can each affect the preparation differently. Measuring these categories helps bioengineers identify process-related variability and evaluate whether the intended virus remains suitable for its planned biological use.
Each purification operation exploits a different physical or chemical property. Filtration addresses size-based separation, ultracentrifugation uses density differences, and chromatography can distinguish components through charge or binding affinity. Clarification removes unwanted material early, while nuclease treatment targets contaminating nucleic acids. Combining these mechanisms broadens impurity removal instead of relying on one separation principle.
Low impurity levels alone do not establish that a preparation will perform as intended. Purity evaluation therefore also confirms that the intended virus remains intact and functional. This distinction matters in bioengineering because processing can yield a cleaner preparation while the viral component is not suitable for consistent vector performance, vaccine quality, or gene-delivery research.
A process may begin with a clarified harvest and then incorporate nuclease treatment, filtration, ultracentrifugation, and chromatography. These operations contribute different separation capabilities: clarification and filtration help remove unwanted material, whereas ultracentrifugation and chromatography further separate components by density, size, charge, or binding affinity. The selected combination is intended to improve purity while preserving the virus.
Measurement combines impurity testing with a functional check. Analysts assess host-cell proteins and DNA, endotoxins, residual process reagents, aggregates, and unwanted viral or microbial agents, then confirm that the intended virus remains intact and functional. Together, these results indicate both how effectively contaminants were reduced and whether the preparation retains the properties needed for use.
It is particularly relevant when viral preparations support viral-vector performance, vaccine quality, or gene-delivery research. Controlling impurities can reduce variability and potential immune or toxic effects, making results and products more consistent. Thus, purity is not only a downstream quality measure; it also helps connect manufacturing control with the reliability and safety of biological applications.