Towards reproducible measurement of nanoparticle size using dynamic light scattering: Important controls and considerations

Abstract

The characterization of nanoparticles in dispersions, in particular measuring their size and size distribution, is a prerequisite before they can be used in toxicological testing. Such characterization requires reliable methods with good reproducibility. The aim of this study was to evaluate the reproducibility, and thus the potential of Dynamic Light Scattering (DLS) for nanoparticle size determination. DLS is easy to use and well established in most nanotoxicology laboratories. However, reproducibility and in particular variability between measurements done using different instrumental setups have not been addressed systematically before. Here we performed initial experiments with rather monodisperse dispersions of spherical particles in water. Significant discrepancies in the measured distributions were obtained with different DLS instruments, especially when fitting the data using mathematical inversion methods. Significant errors can be made due to different settings being used for fitting the data. These were even more prominent when working with dilute dispersions of very small particles. Our study has identified several important points to be taken into consideration in order to overcome possible issues in measurement and analysis of nanoparticles using DLS.In practice, however, nanoparticles may have significant polydispersities and/or can be non-spherical. We extend the comparative work on spherical particles, to show how to characterize polydisperse and/or high aspect ratio particles using DLS instruments.

Modified Desolvation Method Enables Simple One-Step Synthesis of Gelatin Nanoparticles from Different Gelatin Types with Any Bloom Values

“…DLS results were different even between technical replicates: for some samples, one or two of three measurements indicated the presence of aggregates or increase of average diameter, whereas other measurements showed narrow distribution. This feature of the DLS method was previously well illustrated by Langevin and co-authors [ 71 ]. They put TiO 2 nanoparticles in a buffer with high ionic strength and measured the diameter of nanoparticles by DLS and differential centrifugal sedimentation, which is much less sensitive to the presence of aggregates than DLS.…”

Acoustic characterisation of pH dependant reversible micellar casein aggregation

“…However, both measurement techniques have limitations. DLS requires particles to be within a certain size range (0.3 nm-10 m) and polydisperse particles can be difficult to measure as larger particles are generally overestimated at the expense of smaller particles [41][42][43]. Turbidity measurements are limited by cost, measurement repeatability and the fragility of sensors [44][45][46].…”

Modified desolvation method enables simple one-step synthesis of gelatin nanoparticles from different gelatin types with any bloom values

“…DLS results were different even between technical replicates: for some samples, one or two of three measurements indicated the presence of aggregates or increase of average diameter, whereas other measurements showed narrow distribution. This feature of the DLS method was previously well illustrated by Langevin and co-authors (Langevin, 2018). They put TiO2 nanoparticles in a buffer with high ionic strength and measured the diameter of nanoparticles by DLS and differential centrifugal sedimentation, which is much less sensitive to the presence of aggregates than DLS.…”