Optical paper-based sensor for ascorbic acid quantification using silver nanoparticles.

Autor:	Ferreira DC; LNNano - Laboratório Nacional de Nanotecnologia, Centro Nacional de Pesquisa em Energia e Materiais, CEP 13083-970, Campinas, São Paulo, Brazil. Electronic address: daniellecristhina@hotmail.com., Giordano GF; LNNano - Laboratório Nacional de Nanotecnologia, Centro Nacional de Pesquisa em Energia e Materiais, CEP 13083-970, Campinas, São Paulo, Brazil., Soares CC; LNNano - Laboratório Nacional de Nanotecnologia, Centro Nacional de Pesquisa em Energia e Materiais, CEP 13083-970, Campinas, São Paulo, Brazil., de Oliveira JF; LNLS - Laboratório Nacional de Luz Síncrotron, Centro Nacional de Pesquisa em Energia e Materiais, CEP 13083-970, Campinas, São Paulo, Brazil; Instituto de Química, Universidade Estadual de Campinas, CEP 13083-970, Campinas, São Paulo, Brazil., Mendes RK; Pontíficia Universidade Católica de Campinas, Faculdade de Química, CEP 13012-970, Campinas, São Paulo, Brazil., Piazzetta MH; LNNano - Laboratório Nacional de Nanotecnologia, Centro Nacional de Pesquisa em Energia e Materiais, CEP 13083-970, Campinas, São Paulo, Brazil., Gobbi AL; LNNano - Laboratório Nacional de Nanotecnologia, Centro Nacional de Pesquisa em Energia e Materiais, CEP 13083-970, Campinas, São Paulo, Brazil., Cardoso MB; LNLS - Laboratório Nacional de Luz Síncrotron, Centro Nacional de Pesquisa em Energia e Materiais, CEP 13083-970, Campinas, São Paulo, Brazil; Instituto de Química, Universidade Estadual de Campinas, CEP 13083-970, Campinas, São Paulo, Brazil. Electronic address: cardosomb@lnls.br.
Jazyk:	angličtina
Zdroj:	Talanta [Talanta] 2015 Aug 15; Vol. 141, pp. 188-94. Date of Electronic Publication: 2015 Apr 09.
DOI:	10.1016/j.talanta.2015.03.067
Abstrakt:	In this paper, we demonstrate for the first time the use of silver nanoparticles (AgNPs) for colorimetric ascorbic acid (AA) quantification in a paper-based sensor. This device is constituted by spot tests modified with AgNPs and silver ions bordered by a hydrophobic barrier which provides quantitative and fast analysis of AA. In addition, this device is employed as point-of-care monitoring using a unique drop of the sample. AgNPs paper-based sensor changed from light yellow to gray color after the addition of AA due to nanoparticle growth and clusters formation. The color intensities were altered as a function of AA concentration which were measured by either a scanner or a homemade portable transmittance colorimeter. Under the selected measurement conditions, results presented limit of detection which was comparable to analytical laboratory-based methodologies. In addition, the sensitivity of our sensor was comparable to the standard titration method when real samples were investigated. (Copyright © 2015 Elsevier B.V. All rights reserved.)
Databáze:	MEDLINE
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