Fig. 3From: Polymeric Nanoparticles of Brazilian Red Propolis Extract: Preparation, Characterization, Antioxidant and Leishmanicidal ActivityScanning electron microscopy of NRPE in different freeze-drying conditions. a, b Method A of drying at room temperature in freeze-drying (NRPE A2). c, d Method B of drying in freeze-drying (NRPE A21). e, f Method C of drying in freeze-drying using cryoprotectants: colloidal silicon dioxide e and sodium starch glycolate f of the NRPE A4 compositionBack to article page