Liposomes are nowadays frequently used as drug delivery systems, and as such requires that they are well characterized for manufacturing and batch release. This characterization includes their size and size distribution. For these parameters, dynamic light scattering (DLS) is commonly used to characterize size and size distribution and also nanoparticle tracking analysis (NTA) has previously been shown to be useful for measuring liposomes size and concentration.1 This application note will demonstrate how the multi-angle DLS (MADLS®) based particle concentration measurement in the Zetasizer Ultra is capable of measuring the particle concentration as well as size and size distribution of a range of dilutions of a liposome sample. A comparison will be made with NTA measurements of the same samples.

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