Artículos de revistas
Optical Paper-based Sensor For Ascorbic Acid Quantification Using Silver Nanoparticles
Registro en:
Talanta. Elsevier, v. 141, p. 188 - 194, 2015.
399140
10.1016/j.talanta.2015.03.067
2-s2.0-84928153835
Institución
Resumen
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. © 2015 Elsevier B.V. 141
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