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Microscope images: (a) Scanning electron microscope (SEM) image of HSA-NPs of a size of 196 ± 5 nm and a charge of 15 kV prepared under optimized experimental conditions (scale = 1 µm); and a (b) SEM image of HSA–HU-NPs, size of 288 ± 10 nm and a charge of 15 kV prepared from optimized experimental conditions with 2 mg/mL starting HU concentration (scale = 2 µm).
