Carboxylated Graphene-Copper Material Modified Electrode For Detection Of Sunset Yellow And Glucose

Nanomaterials are used in food detection because of their large specific surface area,good electrical conductivity and easy modification.Food safety and nutrition is one of the hot topics that people care about at present.Testing the nutrition and safety of food is related to the national economy and people’s livelihood.General detection methods are not widely used due to the defects of long time,expensive equipment,high cost and so on.In this experiment,Carboxyl graphene and copper nanoparticles modified glassy carbon electrode(CG-Cu/GCE)were used to detect sunset yellow and glucose.The main research contents,results and conclusions are as follows:1)A GC-Cu/GCE was prepared by electrodeposition method.And the electrodeposition time and voltage were optimized.The appearance of the composite material was characterized by scanning electron microscopy.2)Cyclic voltammetry(CV)and chronoamperometry(i-t)were used for the electrochemical the detection of sunset yellow.A reversible redox peak wsa observed at CG-Cu/GCE by CV scanning.Under the optimal conditions,I-t method was used to measure the peak current value of sunset yellow.The peak current value its concentration had good linear relation with in the range of 5×10-7~1×10-3mol/L,and detection limit was 4×10-7 mol/L.It can be used for the determination of actual samples,and the recovery was 99% ~ 105%.3)The electrochemical behavior of glucose on a CG-Cu/GCE was studied.The experimental results showed that under the optimal experimental conditions,the peak current value of glucose measured by i-t and its concentration showed two linear relationships in the range of 1×10-7~1×10-3mol/L,and the detection limit was 1×10-8mol/L.The electrode had good electrochemical catalytic performance,and was used for the detection of practical samples.The recovery wsas 98% ~ 103%.