Fig. 7From: Process development and quality attributes for the freeze-drying process in pharmaceuticals, biopharmaceuticals and nanomedicine delivery: a state-of-the-art reviewScanning electron microscope (SEM) images for the surface (a) and inner structure (c) of the chitosomes freeze-dried tablets and marketed drug product (b and d), respectively [Reproduced from Ahmed et al. [82] with kind permission of the copyright holder, Elsevier, Amsterdam]Back to article page