The adoption of GBMs in commercial products requires their scalable and reproducible production . Currently there are numerous strategies to produce GBMs with a variety of physicochemical properties, which raises the call for standardisation. Standardisation has been applied to the classification of GBMs , which resulted in the recent terminology standard ISO/TS 80004-13 . Nevertheless, this initial effort needs to be followed by the establishment of suitable techniques to probe the physicochemical properties of GBMs, so they can be correctly classified . This is even more paramount in biomedicine , where quality control requirements are more stringent.