The biopharmaceutical industry is experiencing a paradigm shift toward advanced therapeutic modalities including lipid nanoparticles for mRNA delivery, viral vectors for gene therapy, and extracellular vesicles for targeted drug delivery. These complex biological nanoparticles demand sophisticated characterisation techniques that go beyond bulk measurements to provide particle-by-particle analysis. Nanoparticle tracking analysis has emerged as an essential tool for biopharmaceutical development, offering unique capabilities for visualising, sizing, and counting individual nanoparticles in solution.
How Nanoparticle Tracking Analysis Works
Nanoparticle tracking analysis operates by illuminating a thin layer of sample with a laser beam and capturing video of the scattered light from individual particles using a high-sensitivity camera. Advanced image analysis software then tracks the Brownian motion of each particle, calculating its hydrodynamic diameter from the rate of diffusion using the Stokes-Einstein equation. Unlike ensemble techniques that measure average properties, NTA provides individual particle measurements, yielding high-resolution size distributions and direct particle concentration data.
Key Applications in Biopharmaceutical Development
The unique capabilities of NTA make it invaluable across multiple stages of biopharmaceutical development:
- Lipid nanoparticle characterisation β Size distribution and concentration measurement of LNPs for mRNA and siRNA delivery, supporting formulation optimisation and batch-to-batch consistency assessment
- Viral vector analysis β Quantification of adeno-associated virus and lentiviral vector preparations, distinguishing full from empty capsids based on light scattering properties
- Extracellular vesicle research β Size and concentration analysis of exosomes and microvesicles for diagnostic biomarker discovery and therapeutic delivery applications
- Protein aggregation studies β Detection and characterisation of sub-visible protein aggregates that may impact immunogenicity and product safety
- Vaccine development β Characterisation of adjuvant nanoparticles and virus-like particles used in modern vaccine formulations
Fluorescence Mode for Specific Detection
A powerful extension of NTA is its fluorescence mode, which enables specific detection of fluorescently labelled nanoparticles against a complex biological background. This capability is particularly valuable for characterising specific nanoparticle populations in heterogeneous samples such as cell culture supernatants, plasma, and tissue extracts. By selectively detecting fluorescently tagged particles, researchers can differentiate their particles of interest from background debris and biological contaminants.
From Research to Quality Control
As biopharmaceutical products based on nanoparticle delivery systems advance through clinical development toward commercial manufacturing, the need for robust, validated characterisation methods grows. NTA is increasingly being adopted as a quality control tool for nanoparticle-based therapeutics, with several regulatory submissions now incorporating NTA data as part of their analytical characterisation packages.
Our NanoSight platform delivers the measurement performance, data quality, and regulatory compliance features needed to support both research and quality control applications. With automated sample handling, standardised measurement protocols, and comprehensive data analysis capabilities, the NanoSight range enables biopharmaceutical scientists to generate reliable nanoparticle characterisation data that supports informed decision-making throughout the product lifecycle.
Complementary Characterisation Strategies
While NTA provides unique particle-by-particle analysis capabilities, comprehensive nanoparticle characterisation typically requires a multi-technique approach. Combining NTA with dynamic light scattering for ensemble size measurement, electrophoretic light scattering for zeta potential, and multi-angle light scattering for molecular weight determination provides a complete characterisation picture. Malvern Panalytical's integrated portfolio of light scattering instruments enables biopharmaceutical scientists to implement comprehensive characterisation strategies using instruments from a single, trusted supplier.