Effect of Gold Nanosphere Surface Chemistry on Protein Adsorption and Cell Uptake In Vitro
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Gold nanoparticles exhibit unique spectral properties that make them ideal for biosensing, imaging, drug delivery, and other therapeutic applications. Interaction of gold nanoparticles within biological environments is dependent on surface characteristics, which may rely on particular capping agents. In this study, gold nanospheres (GNS) synthesized with different capping agents—specifically citric acid (CA) and tannic acid (TA)—were compared for serum protein adsorption and cellular uptake into a lung epithelial cell line (A549). Both GNS samples exhibited noticeable protein adsorption based on surface charge data after exposure to serum proteins. Light scattering measurements revealed that GNS-CA-protein composites were smaller and less dense compared to GNS-TA-protein composites. The cell uptake characteristics of these nanoparticles were also different. GNS-CA formed large clusters and elicited high uptake, while GNS-TA were taken up as discrete particles, possibly through nonendosomal mechanisms. These results indicate that the capping agents used for GNS synthesis result in unique biological interactions.
KeywordsGold nanoparticles Tannic acid Citric acid Surface chemistry Stabilizing agent Cell uptake Protein adsorption
Ms. Mukhopadhyay was supported through the Wright Scholar program. This research was supported in part by an appointment to the Postgraduate Research Participation Program at the US Air Force Research Laboratory administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the US Department of Energy and USAFRL.
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