Silver-modified nitrogen-doped graphene quantum dots as a sensor for formaldehyde in milk using headspace micro-extraction on a single-drop of aqueous nanoparticles dispersion
Tipo
Artigo
Data de publicação
2022
Periódico
Analytica Chimica Acta
Citações (Scopus)
3
Autores
Padilha J.D.S.
Pedrozo-Penafiel M.J.
Azevedo M.F.M.F.
De Falco A.
Larrude D.R.G.
Maia da Costa M.E.H.
Aucelio R.Q.
Pedrozo-Penafiel M.J.
Azevedo M.F.M.F.
De Falco A.
Larrude D.R.G.
Maia da Costa M.E.H.
Aucelio R.Q.
Orientador
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Programa
Resumo
© 2022 Elsevier B.V.Background: Fraudulent practices used to distort the quality of milk and derivatives include the addition of formaldehyde. Results: A formaldehyde sensor was developed based on the luminescence of newly proposed N-doped graphene quantum dots modified with silver (N-GQDs-Ag) that were prepared using a simple method. A microdroplet of the nanoparticle dispersion was used to collect formaldehyde vapor by headspace single-drop micro-extraction (HS-SDME). After, the microdroplet was diluted in water, the nanoparticle photoluminescence quenching, caused by the analyte, was measured. The strong luminescent quenching allowed a detection limit at 1.7 × 10−4% w/v. Response was selective towards formaldehyde. Significance: The method was effective and a cost-effective method for screening analysis of milk samples with matrix interferences minimized due to the nature of nanoparticle (prepared using Tollen's reagent) and due to the probing at the headspace of the sample cell. Results were statistically similar to those obtained using liquid chromatography.
Descrição
Palavras-chave
Assuntos Scopus
Headspace single-drop micro-extraction , Headspaces , Micro droplets , Microextraction , Milk , Modified graphene quantum dot , Nano-particle dispersions , Nitrogen doped graphene , Single drop micro extractions , Single drops , Animals , Formaldehyde , Graphite , Milk , Nitrogen , Quantum Dots , Silver , Water