| Autor: |
Döll EG; Laboratory of Biosensors, Department of Chemistry, Federal University of Santa Catarina, Florianópolis 88040 900, Santa Catarina, Brazil., Santana ER; Laboratory of Biosensors, Department of Chemistry, Federal University of Santa Catarina, Florianópolis 88040 900, Santa Catarina, Brazil., Winiarski JP; Laboratory of Biosensors, Department of Chemistry, Federal University of Santa Catarina, Florianópolis 88040 900, Santa Catarina, Brazil., Baumgarten LG; Laboratory of Biosensors, Department of Chemistry, Federal University of Santa Catarina, Florianópolis 88040 900, Santa Catarina, Brazil., Vieira IC; Laboratory of Biosensors, Department of Chemistry, Federal University of Santa Catarina, Florianópolis 88040 900, Santa Catarina, Brazil. |
| Abstrakt: |
Butylated hydroxyanisole (BHA) is a synthetic phenolic antioxidant widely used in various food matrices to prevent oxidative rancidity. However, its presence has been associated with liver damage and carcinogenesis in animals. Thus, an electrochemical sensor was built using a composite of gold nanoparticles synthesized in peach extract ( Prunus persica (L.) Batsch) and graphene. Peach extract served as a reducing and stabilizing agent for gold nanoparticles, as a dispersing agent for graphene, and as a film former to immobilize the composite on the surface of a glassy carbon electrode. The gold nanoparticles were characterized using spectroscopic and microscopic techniques, and the electrodes were electrochemically characterized using electrochemical impedance spectroscopy and cyclic voltammetry. The sensor provided higher current responses and lower charge transfer resistances compared to the unmodified glassy carbon electrode. Under the established optimized working conditions (0.1 mol L -1 Britton-Robinson buffer, pH 4.0, and differential pulse voltammetry), the calibration curve exhibited a linear range from 0.2 to 9.8 µmol L -1 , with a detection limit of 70 nmol L -1 . The proposed sensor represented a sensitive and practical analytical tool for the accurate determination of BHA in mayonnaise samples. |
