On-site detection of sub-mg/kg melamine mixed in powdered infant formula and chocolate using sharp-edged gold nanostar substrates.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess
; 35(6): 1017-1026, 2018 Jun.
Article
en En
| MEDLINE
| ID: mdl-29727263
ABSTRACT
We report a facile method for sample preparation and sensitive on-site detection of melamine in powdered infant formula and chocolate using Raman spectroscopy on sharp-edged gold nanostars (AuNSs). The aggregation of AuNSs by sodium chloride (1.2 M) facilitates the more sensitive detection of melamine in comparison with spherical gold nanoparticles (AuNPs). Density functional theory quantum mechanical calculations were performed to determine the energetic stability on gold cluster atoms. Our spectroscopic data indicated that AuNSs are an efficient platform for detecting melamine in food mixtures. The detection limits of melamine in powdered infant formula and chocolate were found to be ~0.1 mg/kg and ~1 mg/kg, respectively, on AuNPs, whereas they were observed to be ~0.01 mg/kg and ~0.1 mg/kg, respectively, on AuNSs. Using a handheld Raman spectrometer, a sub-mg/kg detection of melamine in both powdered infant formula and chocolate could be achieved within a few minutes.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Polvos
/
Triazinas
/
Contaminación de Alimentos
/
Fórmulas Infantiles
/
Nanopartículas del Metal
/
Chocolate
/
Oro
Tipo de estudio:
Diagnostic_studies
Límite:
Humans
/
Infant
Idioma:
En
Revista:
Food Addit Contam Part A Chem Anal Control Expo Risk Assess
Asunto de la revista:
CIENCIAS DA NUTRICAO
Año:
2018
Tipo del documento:
Article