Enhanced dispersion stability of gold nanoparticles by the physisorption of cyclic poly(ethylene glycol).

Abstract:

:Nano-sized metal particles are attracting much interest in industrial and biomedical applications due to the recent progress and development of nanotechnology, and the surface-modifications by appropriate polymers are key techniques to stably express their characteristics. Herein, we applied cyclic poly(ethylene glycol) (c-PEG), having no chemical inhomogeneity, to provide a polymer topology-dependent stabilization for the surface-modification of gold nanoparticles (AuNPs) through physisorption. By simply mixing c-PEG, but not linear counterparts, enables AuNPs to maintain dispersibility through freezing, lyophilization, or heating. Surprisingly, c-PEG endowed AuNPs with even better dispersion stability than thiolated PEG (HS-PEG-OMe). The stronger affinity of c-PEG was confirmed by DLS, ζ-potential, and FT-IR. Furthermore, the c-PEG system exhibited prolonged blood circulation and enhanced tumor accumulation in mice. Our data suggests that c-PEG induces physisorption on AuNPs, supplying sufficient stability toward bio-medical applications, and would be an alternative approach to the gold-sulfur chemisorption.

journal_name

Nat Commun

journal_title

Nature communications

authors

Wang Y,Quinsaat JEQ,Ono T,Maeki M,Tokeshi M,Isono T,Tajima K,Satoh T,Sato SI,Miura Y,Yamamoto T

doi

10.1038/s41467-020-19947-8

subject

Has Abstract

pub_date

2020-11-30 00:00:00

pages

6089

issue

1

issn

2041-1723

pii

10.1038/s41467-020-19947-8

journal_volume

11

pub_type

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