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dc.contributor.authorChen, Allen L.
Jackson, Meredith A.
Lin, Adam Y.
Figueroa, Elizabeth R.
Hu, Ying S.
Evans, Emily R.
Asthana, Vishwaratn
Young, Joseph K.
Drezek, Rebekah A.
dc.date.accessioned 2017-05-04T19:43:55Z
dc.date.available 2017-05-04T19:43:55Z
dc.date.issued 2016
dc.identifier.citation Chen, Allen L., Jackson, Meredith A., Lin, Adam Y., et al.. "Changes in Optical Properties of Plasmonic Nanoparticles in Cellular Environments are Modulated by Nanoparticle PEGylation and Serum Conditions." Nanoscale Research Letters, 11, (2016) Springer: http://dx.doi.org/10.1186/s11671-016-1524-4.
dc.identifier.urihttps://hdl.handle.net/1911/94184
dc.description.abstract When plasmonic nanoparticles (NPs) are internalized by cells and agglomerate within intracellular vesicles, their optical spectra can shift and broaden as a result of plasmonic coupling of NPs in close proximity to one another. For such optical changes to be accounted for in the design of plasmonic NPs for light-based biomedical applications, quantitative design relationships between designable factors and spectral shifts need to be established. Here we begin building such a framework by investigating how functionalization of gold NPs (AuNPs) with biocompatible poly(ethylene) glycol (PEG), and the serum conditions in which the NPs are introduced to cells impact the optical changes exhibited by NPs in a cellular context. Utilizing darkfield hyperspectral imaging, we find that PEGylation decreases the spectral shifting and spectral broadening experienced by 100 nm AuNPs following uptake by Sk-Br-3 cells, but up to a 33 ± 12 nm shift in the spectral peak wavelength can still occur. The serum protein-containing biological medium also modulates the spectral changes experienced by cell-exposed NPs through the formation of a protein corona on the surface of NPs that mediates NP interactions with cells: PEGylated AuNPs exposed to cells in serum-free conditions experience greater spectral shifts than in serum-containing environments. Moreover, increased concentrations of serum (10, 25, or 50 %) result in the formation of smaller intracellular NP clusters and correspondingly reduced spectral shifts after 5 and 10 h NP-cell exposure. However, after 24 h, NP cluster size and spectral shifts are comparable and become independent of serum concentration. By elucidating the impact of PEGylation and serum concentration on the spectral changes experienced by plasmonic NPs in cells, this study provides a foundation for the optical engineering of plasmonic NPs for use in biomedical environments.
dc.language.iso eng
dc.publisher Springer
dc.rights This article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.title Changes in Optical Properties of Plasmonic Nanoparticles in Cellular Environments are Modulated by Nanoparticle PEGylation and Serum Conditions
dc.type Journal article
dc.citation.journalTitle Nanoscale Research Letters
dc.subject.keywordCells
Gold nanoparticles
Hyperspectral imaging
Nano-bio interactions
Nanomedicine
Plasmonics
Poly(ethylene glycol)
Protein corona
Serum
Spectral shifting
dc.citation.volumeNumber 11
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1186/s11671-016-1524-4
dc.identifier.pmcid PMC4912538
dc.identifier.pmid 27316744
dc.type.publication publisher version
dc.citation.articleNumber 303


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