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UV-Vis absorbance spectra of the folate conjugated HBPH nanoparticles encapsulated with ICG (Fol-ICG-HBPH NPs) and Cyt C (Fol-Cyt C/ICG-HBPH NPs), showing absorbance at 355 nm, 414 nm and at 835 nm for folic acid, encapsulated Cyt C and ICG dye, respectively. Inset: Fluorescence emission spectra of the Fol-ICG-HBPH nanoparticles showing emission maximum at 865 nm. Similar results obtained from the corresponding Cyt C encapsulating HBPH nanoparticles.
