Surfactant coated silver nanoparticles as manganese fluorescent sensor: Manganese quantification in argentinian wines

Abstract

A number of red, white, rose and blend wines from vineyards of the west region of Argentina were analyzed for Mn(II) traces quantification by solid surface fluorescence using silver nanoparticles as sensors. Nanoparticles were synthesized and coated with sodium dodecylsulphate by sonochemical procedure, characterized in composition and size; they are proposed as nanosensor for the Mn(II) quantification. Experimental variables that influence on analytical quality of synthesis, sorption and determination steps were studied and optimized. Thanks to the implementation of solid phase extraction procedure on filter paper with a determination step by solid surface fluorescence, an adequate tolerance to foreign species was obtained. At optimal experimental conditions (λem = 502 nm; λεxc = 460 nm; Filter paper Blue Ribbon with Sodium Dodecyl Sulfate coated Silver Nanoparticles; pH 8.0 employed phosphate buffer at concentration 2.5 × 10−4 mol/L), a limit of detection of 0.064 µg/L and a limit of quantification of 0.194 µg/L were reached. The new methodology was successfully applied to analyte determination in the 17 argentinian wines including Cabernet Sauvignon, Malbec, Tempranillo, Tocai, Viognier, Chardonnay, Sauvignon Blanc, Tannat, Malbec and Pinot strains. Recovery studies showed values near to 100% being validated by ICP-MS.