Journal
MOLECULES
Volume 24, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/molecules24010152
Keywords
carbon nanodots; functional groups; antioxidation; radical scavenging; electro-chemistry; charge transfer
Funding
- US National Science Foundation [1832134]
- North Carolina State fund through the Joint School of Nanoscience and Nanoengineering (JSNN)
- National Science Foundation [ECCS-1542174]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1832134] Funding Source: National Science Foundation
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Carbon nanodots (CNDs) have shown good antioxidant capabilities by scavenging oxidant free radicals such as diphenyl-1-picrylhydrazyl radical (DPPH center dot) and reactive oxygen species. While some studies suggest that the antioxidation activities associate to the proton donor role of surface active groups like carboxyl groups (-COOH), it is unclear how exactly the extent of oxidant scavenging potential and its related mechanisms are influenced by functional groups on CNDs' surfaces. In this work, carboxyl and the amino functional groups on CNDs' surfaces are modified to investigate the individual influence of intermolecular interactions with DPPH center dot free radical by UV-Vis spectroscopy and electrochemistry. The results suggest that both the carboxyl and the amino groups contribute to the antioxidation activity of CNDs through either a direct or indirect hydrogen atom transfer reaction with DPPH center dot.
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