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PEGylated Nanoceria as Radical Scavenger with Tunable Redox Chemistry

Open access
Karakoti, Ajay S., Singh, Sanjay, Kumar, Amit, Malinska, Maura, Kuchibhatla, Satyanarayana V. N. T., Wozniak, Krzysztof, Self, William T., Seal, Sudipta·2009·Journal of the American Chemical Society

Abstract

We report the direct synthesis of cerium oxide nanoparticles (CNPs) in polyethylene glycol (PEG) based solutions with efficient radical scavenging properties. Synthesis of CNPs in PEG demonstrated a concentration dependent (of PEG) redox activity characterized by UV-visible spectroscopy. PEGylated CNPs acted as efficient radical scavengers, and superoxide dismutase (SOD) activity of CNPs synthesized in various concentration of PEG did not reduce compared to bare nanoceria. In addition to superoxide, PEGylated nanoceria demonstrated quenching of peroxide radicals as well. It was observed that the reaction with hydrogen peroxide leads to the formation of a charge transfer complex governed by the concentration of PEG. The stability of the charge transfer complex provides the tunable oxidation state of CNPs. The stability of this complex influences the regenerative capacity of the active 3+ oxidation state of CNPs. The cell viability as well as SOD activity of PEGylated CNPs is compared to those of bare CNPs, and the differences are outlined.

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Crossref · 10.1021/ja9051087

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Metadata

Authors
Karakoti, A. S., Singh, S., Kumar, A., Malinska, M., Kuchibhatla, S. V. N. T., Wozniak, K., Self, W. T., & Seal, S.
Venue
Journal of the American Chemical Society
Published
2009-09-21
Volume
131
Issue
40
Pages
14144-14145
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2049011008
Cited by
343
References
1
FWCI
7.66
Type
journal article
Language
en
Open access
green

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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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