Portal de Periódicos da CAPES

Fluorescent carbon nanodots for sensitive and selective detection of tannic acid in wines

2014; Elsevier BV; Volume: 132; Linguagem: Inglês

10.1016/j.talanta.2014.09.028

1873-3573

Gaber Hashem Gaber Ahmed, Rosana Badía‐Laíño, Josefa A. Garcı́a Calzón, Marta Elena Díaz‐García,

Mercury impact and mitigation studies

Herein we describe an easy one step synthesis of carbon nanodots (C-dots) by thermal carbonization of 6-bromohexylboronic acid using two different amine compounds, polyethyleneglycol bis(3-aminopropyl (PEGA) and 1,2-aminopropane (DPA), at 180 °C in atmospheric oxygen. The as-synthesized C-dots were characterized by FTIR, HRTEM, NMR and fluorescence. The C-dots prepared using PEGA showed a strong emission at 440 nm with excitation at 362 nm. These C-dots exhibited analytical potential as sensing probes for tannic acid (TA) determination. pH effect, interferences, and analytical performance of the method were investigated. The method was found effective in the linear concentration range from 0.1 to 10 mg L−1 TA achieving a limit of detection equal 0.018 mg L−1 TA. The applicability of the method was demonstrated by direct measurements of TA in red and white wine samples. Validation of the method was achieved by spiking the wine samples with different standard TA concentrations obtaining recoveries in the range (90–112.5%). A probable mechanism by which TA quenched the C-dots fluorescence was proposed.