Critical Evaluation of Nanoparticle Tracking Analysis (NTA) by NanoSight for the Measurement of Nanoparticles and Protein Aggregates

TLDR

Sample visualization and individual particle tracking enable thorough size‑distribution analysis, and live monitoring of heat‑induced protein aggregation provides kinetics and submicron aggregate size information, underscoring NTA’s value for polydisperse nanosized particles and protein aggregates. The study evaluates NTA against DLS and tests its performance in characterizing drug delivery nanoparticles and protein aggregates using standard polystyrene beads from 60 to 1,000 nm and their mixtures. The authors assessed NTA and DLS on standard beads, varied particle‑population ratios, and analyzed drug delivery nanoparticles and protein aggregates to determine detection limits and sizing accuracy. NTA accurately measured size distributions of monodisperse and polydisperse samples, detected broad population ratios and small amounts of large particles without compromising accuracy, and proved suitable for characterizing drug delivery nanoparticles and protein aggregates, complementing DLS.

Abstract

To evaluate the nanoparticle tracking analysis (NTA) technique, compare it with dynamic light scattering (DLS) and test its performance in characterizing drug delivery nanoparticles and protein aggregates.Standard polystyrene beads of sizes ranging from 60 to 1,000 nm and physical mixtures thereof were analyzed with NTA and DLS. The influence of different ratios of particle populations was tested. Drug delivery nanoparticles and protein aggregates were analyzed by NTA and DLS. Live monitoring of heat-induced protein aggregation was performed with NTA.NTA was shown to accurately analyze the size distribution of monodisperse and polydisperse samples. Sample visualization and individual particle tracking are features that enable a thorough size distribution analysis. The presence of small amounts of large (1,000 nm) particles generally does not compromise the accuracy of NTA measurements, and a broad range of population ratios can easily be detected and accurately sized. NTA proved to be suitable to characterize drug delivery nanoparticles and protein aggregates, complementing DLS. Live monitoring of heat-induced protein aggregation provides information about aggregation kinetics and size of submicron aggregates.NTA is a powerful characterization technique that complements DLS and is particularly valuable for analyzing polydisperse nanosized particles and protein aggregates.