Radiation-synthesized protein-based drug carriers: Size-controlled BSA nanoparticles

Nanotechnology has broadened the options for the delivery of agents of biotechnological and clinical relevance. Currently, attention has been driven towards the development of protein-based nanocarriers due to high the biocompatibility and site-specific delivery. In this work we report radiation-synthesized bovine serum albumin nanoparticles as an attempt to overcome limitations of available albumin particles, as a novel route for the development of crosslinked protein nanocarriers for the administration of chemotherapic agents or radiopharmaceuticals. Albumin containing phosphate buffer solutions were irradiated using γ-irradiation at distinct cosolvent concentrations-ethanol or methanol. Nanoparticle size was followed by DLS and bityrosine crosslinking formation using fluorescence measurements and SDS-PAGE. In addition, computational experiments were performed to elucidate the mechanism and pathways for the nanoparticle formation. The synthesis of BSA nanoparticles using γ-irradiation in the presence of a cosolvent allowed the formation of the nanoparticles from 7 to 70 nm without the use of any chemical crosslinker as confirmed by SDS-PAGE and DLS analysis. The combination of cosolvent and γ-irradiation allowed a fine tuning with regard to protein size.