Facile Synthesis of Gold/Graphene Nanocomposites for Simultaneous Determination of Sunset Yellow and Tartrazine in Soft Drinks

Herein, poly (diallyldimethylammonium chloride) (PDDA) functionalized gold nanoparticles/graphene (AuNPs/Gr) composites were prepared by the one-pot method under simple, rapid and mild conditions. The prepared nanocomposites combined the excellent conductivity and electrocatalytic performance of Gr and AuNPs. Based on the above advantages, an outstanding electrochemical sensor was constructed to detect sunset yellow (SY) and tartrazine (TZ) simultaneously. Under the optimum conditions, the linear response ranges for SY and TZ were 0.006-5.0 and 0.008-3.0 mu mol/L, with low detection limits of 2.0 and 2.5 nmol/L, respectively. The as-proposed sensor displayed long-term stability, anti-interference performance and reproducibility, revealing its promising method for practical monitoring.

Automated summary

By utilizing the excellent properties of graphene and gold nanoparticles, an electrochemical sensor for detecting SY and TZ was successfully constructed, showing low detection limits and good stability and reproducibility.