In the last years, intense efforts have been made in order to obtain colloidal-based systems capable of pointing out the presence of melamine in food samples. In this work, we reported about the recognition of melamine in aqueous solution, using gold nanoparticles stabilized with 3-mercapto-1-propanesulfonate (AuNPs-3MPS), with the aim of deepening how the recognition process works. AuNPs were synthesized using a wet chemical reduction method. The synthesized AuNPs-3MPS probe was fully characterized, before and after the recognition process, by both physicochemical (UV–vis, FT-IR, 1H-NMR, DLS and ζ-potential) and morphostructural techniques (AFM, HR-TEM). The chemical and electronic structure was also investigated by SR-XPS. The sensing method is based on the melamine-induced aggregation of AuNPs; the presence of melamine was successfully detected in the range of 2.5−500 ppm. The results achieved also demonstrate that negatively charged AuNPs-3MPS are potentially useful for determining melamine contents in aqueous solution. SR-XPS measurements allowed to understand interaction mechanism between the probe and the analyte. The presence of sulfonate groups allows a mutual interaction mediated by electrostatic bonds between nanoparticles surface thiols and positively charged amino groups of melamine molecules.

Study of the interaction mechanism between hydrophilic thiol capped gold nanoparticles and melamine in aqueous medium / Cerra, Sara; Salamone, Tommaso A.; Sciubba, Fabio; Marsotto, Martina; Battocchio, Chiara; Nappini, Silvia; Scaramuzzo, Francesca A.; Li Voti, Roberto; Sibilia, Concita; Matassa, Roberto; Beltrán, Ana Maria; Familiari, Giuseppe; Fratoddi, Ilaria. - In: COLLOIDS AND SURFACES. B, BIOINTERFACES. - ISSN 0927-7765. - 203:(2021), pp. 1-9. [10.1016/j.colsurfb.2021.111727]

Study of the interaction mechanism between hydrophilic thiol capped gold nanoparticles and melamine in aqueous medium

Cerra, Sara
Primo
;
Salamone, Tommaso A.
Secondo
;
Sciubba, Fabio;Marsotto, Martina;Battocchio, Chiara;Scaramuzzo, Francesca A.;Li Voti, Roberto;Sibilia, Concita;Matassa, Roberto;Familiari, Giuseppe;Fratoddi, Ilaria
Ultimo
2021

Abstract

In the last years, intense efforts have been made in order to obtain colloidal-based systems capable of pointing out the presence of melamine in food samples. In this work, we reported about the recognition of melamine in aqueous solution, using gold nanoparticles stabilized with 3-mercapto-1-propanesulfonate (AuNPs-3MPS), with the aim of deepening how the recognition process works. AuNPs were synthesized using a wet chemical reduction method. The synthesized AuNPs-3MPS probe was fully characterized, before and after the recognition process, by both physicochemical (UV–vis, FT-IR, 1H-NMR, DLS and ζ-potential) and morphostructural techniques (AFM, HR-TEM). The chemical and electronic structure was also investigated by SR-XPS. The sensing method is based on the melamine-induced aggregation of AuNPs; the presence of melamine was successfully detected in the range of 2.5−500 ppm. The results achieved also demonstrate that negatively charged AuNPs-3MPS are potentially useful for determining melamine contents in aqueous solution. SR-XPS measurements allowed to understand interaction mechanism between the probe and the analyte. The presence of sulfonate groups allows a mutual interaction mediated by electrostatic bonds between nanoparticles surface thiols and positively charged amino groups of melamine molecules.
File allegati a questo prodotto
File Dimensione Formato  
Cerra_Study_2021.pdf

solo gestori archivio

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 6.81 MB
Formato Adobe PDF
6.81 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Cerra_Pre-print_Study_2021.pdf

accesso aperto

Tipologia: Documento in Pre-print (manoscritto inviato all'editore, precedente alla peer review)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 2.29 MB
Formato Adobe PDF
2.29 MB Adobe PDF Visualizza/Apri PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1544670
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 4
social impact