http://www.cnr.it/ontology/cnr/individuo/prodotto/ID288613
Mechanisms of aggregation of cysteine functionalized gold nanoparticles (Articolo in rivista)
- Type
- Label
- Mechanisms of aggregation of cysteine functionalized gold nanoparticles (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/jp502401w (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Acres R.G.; Feyer V.; Tsud N.; Carlino E.; Prince K.C. (literal)
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- http://www.scopus.com/inward/record.url?eid=2-s2.0-84900795019&partnerID=q2rCbXpz (literal)
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- Rivista
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- Note
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- Elettra-Sincrotrone Trieste S.C.p.A., in Area Science Park, Strada Statale 14, km 163.5, Basovizza (Trieste), 34149, Italy; Peter Grünberg Institute (PGI-6), JARA-FIT, Research Center Jülich, 52425 Jülich, Germany; Faculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University, V Hole?ovikách 2, 18000 Prague 8, Czech Republic; CNR-IOM Laboratorio TASC, Basovizza (Trieste), I-34149, Italy; EChemistry Laboratory, Faculty of Life and Social Sciences, Swinburne University of Technology, Hawthorn, Melbourne, VIC 3122, Australia (literal)
- Titolo
- Mechanisms of aggregation of cysteine functionalized gold nanoparticles (literal)
- Abstract
- The interaction of gold nanoparticles (AuNPs) with
cysteine and its derivatives is the basis of a number of bionanotechnologies,
and for these, the most important process is aggregation (or
antiaggregation), which enables an array of colorimetric detection methods.
When AuNPs were functionalized with cysteine, its dimer cystine, or the
cysteine-derived tripeptide, glutathione, three different mechanisms of
aggregation were observed. Both cysteine and glutathione induced
aggregation of AuNPs without further pH modification: the first by
interparticle zwitterionic interaction and the second by interparticle
hydrogen bonding. Cystine, however, did not induce aggregation, although
it dissociated into two cysteinate moieties upon adsorption on the AuNPs,
which appear to be chemically identical to cysteinate produced from cysteine adsorption. We show that the difference is due to
the lower coverage of cysteinate from cystine and differences in charge states of the adsorbates. On modifying the pH to 1.5, the
surface species become cationic (neutral COOH and protonated NH3
+), and aggregation of cystine/AuNPs occurs immediately
by interparticle hydrogen bonding. Thus, cysteine may induce aggregation by neutral hydrogen bonding or zwitterionic
interaction between nanoparticles, but the mechanism depends sensitively on a number of parameters. (literal)
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