Develeopment Of New Acylorazolone Lanthanide Complexes Sensor And Study The Electrochemical Properties Of Food Additives

In this paper, three novel type of [REL3(HL)]·H2O/Pbpy/GCE (RE: Nd3+、Sm3+、Gd3+, HL:1-p-tolyl-3-methyl-4-(α-furoyl)-5-pyrazolone, Pbpy: polybipyridyl, GCE:glassy electrode carbon) electrochemical sensor were prepared. By cyclic voltammetryand pulse voltammetry systematic study of antioxidants:2,6-di-tert-butyl-4-methylphenol (BHT), sweetener: aspartame (ASP) and food coloring: rouge red (Carmine) andother food additives in the new sensor electrode electrochemical behavior and reactionmechanisms.The electrochemistry properties of2,6-di-tertbutyl-4-methylphenol (BHT) weretested on [GdL3(HL)]·H2O/Pbpy/GCE sensor. Compared to the bare GCE andPbpy/GCE, the [GdL3(HL)]·H2O/Pbpy/GCE showed an excellent electrocatalyticaleffect on the oxidation of BHT with significant increase in the peak current. The resultsshowed that a synergistic effect was existed between polybipytidyl and[GdL3(HL)]·H2O. In the pH=5.0PBS buffer solution, the test of the cyclicvoltammetry curves of the sensor (CV) curves in Ep=0.212V appears at a sensitiveoxidation peak. The peak potential difference (△Ep) compared with GCE andPbpy/GCE decreased400mV,42mV, the peak current increased significantly. Under theoptimum experimental conditions, the oxidation peak current showed a good linearrelationship with the BHT concentration at6.0×10-6~2.0×10-4mol·L-1range. Thedetection limit was1×10-8mol·L-1. This experiment method is successfully used in foodadditives, the content of BHT in recoveries and relative standard deviation issatisfactory.The electrochemical behavior of aspartame (ASP) is studied on [NdL3(HL)]·H2O/Pbpy/GCE sensor. The result shows that compared with the bare GCE andPbpy/GCE, composite film modified electrodes sensor [NdL3(HL)]·H2O/Pbpy/GCE cansignificantly increase the oxidation peak current of aspartame, at the same time reducethe overpotential. In the best experiment condition, the oxidation peak current and ASPconcentration between3×10-6and1×10-4mol·L-1showed good linear relationship withthe detection limit of2.85×10-8mol·L-1. The sensor detects aspartame showed strong selectivity and anti-interference ability, can be used directly in food detection andanalysis of aspartame, has a high sensitivity.The electrochemical behavior of carmine is studied on [SmL3(HL)]·H2O/Pbpy/GCE sensor. The experimental results show that, compared with thebare electrode [SmL3(HL)]·H2O/Pbpy/GCE electrode can significantly increase theoxidation peak current of carmine. Under the condition of optimization, the oxidationpeak current and concentration of carmine between2×10-6and1×10-4mol·L-1showgood linear relationship with the detection limit of2.1×10-8mol·L-1. In the detectionprocess，exhibit strong anti-interference ability and excellent stability. Has been used inactual sample analysis, and has good prospects.