SLS measurements were performed on a Malvern Mastersizer 3000. Sample was dispersed in water by 10 minutes of ultrasonication and the resultant suspensions were injected into a stirred Hydro SV quartz cell, containing more water, to give a laser obscuration of 5 -12%. Particle sizes were fitted according to Mie theory, using the Malvern 'General Purpose' analysis model, for non-spherical particles. A sample refractive index of 1.59, sample absorbance of 0.1 and solvent refractive index of 1.333 were used for fitting.