Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 43, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202200035
Keywords
antifouling; dopamine; oxidative stability; PEGylated gold nanoparticles; reactive oxygen species
Categories
Funding
- National Natural Science Foundation of China [21975094, 22133002]
- Jilin Province International Collaboration Base of Science and Technology [YDZJ202102CXJD004]
- JLU Science and Technology Innovative Research Team [2021TD-03]
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PEGylation is the most effective method for surface modification of gold nanoparticles, but the stability of PEG ligands is an issue. Reactive oxygen species are found to be a major factor causing the detachment of PEG ligands. By using dopamine-functionalized PEG to modify the gold nanoparticles, their stability and antifouling ability can be improved, allowing for control of self-assembly with serum proteins.
PEGylation is the most effective antifouling method for the surface modification of gold nanoparticles (AuNPs). However, thiol-terminated polyethylene glycol (PEG) ligands tethered on the AuNPs are instable in serum and can detach from the AuNP surface, resulting in a significant reduce of their antifouling properties. Herein, it is reported that reactive oxygen species (ROS) is a major factor causing the detachment of PEG ligands from AuNP surfaces. By covalently backfilling dopamine-functionalized PEG on the AuNPs, the stability of PEG ligands on AuNP surface and the antifouling ability of AuNPs can be effectively improved. Tuning the balance between ROS and dopamine-functionalized PEG can be used as a new strategy to control the self-assembly of AuNPs and serum proteins.
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