Tracking Aggregation of Virus-Like Particles Using Dynamic Light Scattering
JoVE Encyclopedia of Experiments
Microbiology
0 views • 2:14 min • July 31st, 2026
Start with a cuvette containing a purified, monodisperse suspension of virus-like particles in a buffer.
These particles contain the capsid, the protein shell of a virus, but they lack genetic material, making them non-infectious.
Place the cuvette in a dynamic light scattering (DLS) instrument that has been preheated to a target temperature.
Allow the sample to equilibrate briefly, then begin the measurements.
Heating causes the capsid proteins to denature. This structural change exposes hydrophobic regions that promote particle clustering and aggregation.
DLS directs a laser beam through the suspension and measures fluctuations in the scattered light caused by particle motion.
Smaller particles move faster and produce rapid fluctuations in the scattered light, while larger aggregates move more slowly and cause slower fluctuations.
DLS analyzes these fluctuations at regular intervals to track the particle aggregation in real time.
Create a new size standard operating procedure in the DLS instrument software as detailed in the text protocol. Select the run arrow within the software to open and name a new sample and allow the instrument to reach the temperature equilibrium.
Transfer the VLP suspension to a small volume quartz cuvette, avoid bubbles, and pipette slowly against the wall of the cuvette. After the instrument has reached temperature equilibrium, insert the cuvette into the sample chamber. After waiting 10 seconds for the sample temperature to equilibrate, start the run and simultaneously start a timer.
Stop the timer at the end of the first measurement. Take this time as the first time point. Obtain subsequent time points from the measurement times recorded by the software.
Overview
This article presents an in vitro protocol for assessing the structural integrity of viral capsids by monitoring heat-induced aggregation of virus-like particles (VLPs) using dynamic light scattering (DLS). The method enables real-time tracking of particle aggregation as a result of protein denaturation, providing insights into capsid stability under thermal stress.
Key Study Components
Area of Science
- Virology
- Biophysics
- Protein Chemistry
Background
- Viral capsids are protein shells that protect viral genetic material.
- Virus-like particles (VLPs) mimic the structure of viruses but lack genetic material, making them non-infectious.
- Capsid stability is crucial for vaccine development and viral vector applications.
- Dynamic light scattering (DLS) is a technique used to measure particle size and aggregation in solution.
Purpose of Study
- To provide an alternative in vitro method for determining viral capsid structural integrity.
- To monitor heat-induced aggregation of VLPs as a proxy for capsid stability.
- To demonstrate the use of DLS for real-time tracking of particle aggregation.
Methods Used
- Preparation of a purified, monodisperse suspension of VLPs in buffer.
- Loading the sample into a preheated DLS instrument and allowing temperature equilibration.
- Measurement of particle size changes over time as the sample is heated.
- Analysis of light scattering fluctuations to detect aggregation events.
Main Results
- Heating causes capsid proteins to denature, exposing hydrophobic regions and promoting aggregation.
- DLS detects increases in particle size corresponding to aggregation events.
- Real-time data collection allows for precise tracking of aggregation kinetics.
- The protocol provides reproducible time points for aggregation onset and progression.
Conclusions
- DLS is an effective tool for monitoring viral capsid structural integrity in vitro.
- The method enables rapid, real-time assessment of capsid stability under thermal stress.
- This approach can be applied to quality control and formulation studies for VLP-based products.
Frequently Asked Questions
Executive Industry Relevance
Dynamic light scattering (DLS) enables real-time, quantitative assessment of virus-like particle (VLP) aggregation, directly informing capsid stability and formulation robustness in early biopharma R&D. This approach supports predictive confidence in the structural integrity of VLP-based therapeutics and vaccines, reducing risk at critical discovery and preclinical inflection points. Integrating DLS-based aggregation tracking enhances portfolio decision-making by providing actionable data on candidate stability under stress conditions.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables direct interrogation of VLP capsid stability under defined thermal stress.
- Supports mechanistic de-risking by quantifying aggregation kinetics linked to protein denaturation.
- Provides functional validation of capsid integrity, informing target selection and triage.
Screening & Assay Development
- Facilitates preparation and validation of monodisperse VLP suspensions for downstream workflows.
- Delivers reproducible, quantitative aggregation measurements for assay standardization.
- Enables screening of formulation conditions to optimize VLP stability profiles.
Translational & Preclinical Research
- Aligns aggregation data with disease-relevant stability requirements for VLP-based therapeutics.
- Supports continuity from discovery through preclinical formulation and stress testing.
- Provides risk-adjusted data for advancing candidates with robust structural profiles.
Pipeline & Workflow Integration
DLS-based aggregation tracking fits within the discovery-to-preclinical continuum, bridging early capsid validation and formulation optimization for VLP-based products.
- Discovery Biology: Quantifies capsid integrity and aggregation onset, supporting hypothesis testing and biological de-risking.
- Screening: Provides standardized, quantitative readouts for formulation and stability screening.
- Analytics: Enables real-time measurement of particle size changes, supporting comparative analysis across conditions.
- Translational Research: Informs preclinical candidate selection based on aggregation resistance under stress.
- Enterprise Reuse: Establishes a reusable platform for VLP and nanoparticle stability assessment across programs.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence in VLP stability and reduces mechanistic ambiguity.
- Operational Value: Standardizes aggregation measurement and supports reproducible, scalable workflows.
- Strategic Value: Improves go/no-go decisions and reduces late-stage risk by providing early stability data.
- Portfolio Impact: Enables risk-adjusted prioritization of VLP candidates based on quantitative aggregation profiles.
Implementation Considerations
- Requires expertise in DLS instrumentation and data interpretation.
- Needs access to temperature-controlled DLS systems and validated sample handling protocols.
- Demands cross-team standardization of aggregation measurement procedures.
- May require adaptation for different VLP types or buffer systems.
- Limited to aggregation events detectable by DLS sensitivity and sample clarity.
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Last updated: 22 August 2026