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Title: Behavior of colloidal gold nanoparticles in different ionic strength media
Author: Barreto, Angela
Luis, Luis G.
Girao, Ana V.
Trindade, Tito
Soares, Amadeu M. V. M.
Oliveira, Miguel
Keywords: IN-VITRO
Issue Date: 2015
Publisher: SPRINGER
Abstract: The increased applications of engineered nanoparticles (NPs) may lead to environmental release and transport to estuarine environments where NPs are expected to aggregate/agglomerate with increasing ionic strength. However, more stable NPs that may be resistant to high ionic strength media and more dispersed in the aquatic environment are being synthesized. Thus, understanding colloidal NPs' behavior in different ionic strength media is crucial for the assessment of the consequences of their environmental release. This work assessed the behavior of gold nanoparticles (AuNPs), with diverse sizes and coatings, in media with different ionic strengths (from biological buffers to artificial seawater). Overall, in biological buffers and artificial seawater, citrate-coated AuNPs were unstable, displaying significantly increased sizes (between 100 and 400 nm), whereas no significant alterations (less than 5 % oscillation) were found for AuNPs with other coatings (bovine serum albumin, polyvinylpyrrolidone, and polyethylene glycol). Data suggest that coated AuNPs, and probably other NPs, may be dispersed in the environment from freshwater to estuarine systems.
Peer review: yes
DOI: 10.1007/s11051-015-3302-0
ISSN: 1388-0764
Publisher Version: 10.1007/s11051-015-3302-0
Appears in Collections:CICECO - Artigos

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