Raynals, an online tool for the analysis of dynamic light scattering

Dynamic light scattering (DLS) is routinely employed to assess the homogeneity and size distribution profile of samples containing microscopic particles in suspension or solubilised polymers. In this work, we introduce Raynals, an user-friendly software for the analysis of single-angle DLS data that uses the Tikhonov-Phillips regularisation. Performance is evaluated on simulated and experimental data, generated by different DLS instruments, for several proteins and gold nanoparticles. DLS data can be easily misinterpreted and the simulation tools available in Raynals allow understanding of the limitations of the measurement and its resolution. It has been designed as a tool to address quality control of biological samples, during sample preparation and optimisation, and it helps in the detection of aggregates showing the influence of large particles. Last, Raynals provides flexibility in the way the data is presented, allows exporting publication-quality figures, it is free for academic use, and can be accessed online on the eSPC data analysis platform at spc.embl-hamburg.de.