Dynamic light scattering (DLS) is a common laboratory technique routinely used for sizing proteins, nanoparticles, polymers, & colloidal emulsions. By utilizing the improved accuracy and resolution of multi-angle dynamic light scattering (MADLS®), it is now possible to determine the absolute particle concentration distribution using the Zetasizer Ultra. This provides the user with a fast assessment of the concentration of each population of particles present within their dispersion.  In this webinar we will give an overview of the particle concentration analysis on the Zetasizer Ultra and provide some examples for liposomes and virus particles.