The Study On Electrochemical Sensor Of Capsaicin Based On Gold Nanomaterials

Capsaicin is an active ingredient that reflects the spicy taste of pepper fruits.Due to its good antioxidant and antibacterial effects,Capsaicin has been widely used in catering,medical,national defense,beauty,and related fields demand for capsaicin It shows a trend of increasing year by year.Accurately grasping the content of capsaicin in its application scenarios is essential to determine the role it can play.Therefore,it is particularly important to develop a rapid,sensitive and accurate capsaicin detection method.There are already many methods for detecting capsaicin.Among the existing methods,the traditional Scoville sensory detection is subjective and the accuracy is not high,but provides a scientific detection method as a basis for future evaluation;Large-scale instrument detection,such as high-performance liquid detection,spectrophotometry,liquid chromatography-mass spectrometry,etc.,limits its commercial development in terms of instrument cost,operation time,and professionalism.Electrochemical methods have broad application prospects due to their fast detection speed,high detection sensitivity,low detection cost,and accurate results.This article uses electrochemical methods to develop a fast,accurate,and efficient method for the detection of capsaicin.The method is as follows:(1)Acetylene black,gold nanoparticles and Nafion were sequentially modified on the surface of the glassy carbon electrode by the drop coating method,and Nafion/AuNPs/AB/GCE were prepared as capsaicin electrochemical sensors.Performance evaluation results show that under the optimized working conditions,the dynamic linear range of the electrochemical sensor for capsaicin detection is 0.32 ～24 μmol/L,and the detection limit is 0.21 μmol/L(S / N = 3).Further research shows that the sensor has good reproducibility and stability.In the actual sample detection,the recovery rate of the sensor spiked reached 98.30～102.00%,reflecting good accuracy.The sensor has a simple preparation process and low cost,and is expected to become a new detection method in the field of capsaicin analysis.(2)First,the ordered mesoporous carbon(OMC)was modified on the surface of the glassy carbon electrode(GCE)by the method of drop coating,and then a layer of gold nanoparticles(AuNPs)was deposited on it by electrodeposition to prepare AuNPs/OMC/GCE as Capsaicin electrochemical sensor.The performance of the sensor was evaluated by electrochemical method in the presence of sodium dodecyl sulfate(SDS).The results of performance evaluation show that the presence of SDS promotes the electrochemical behavior of capsaicin on the surface of AuNPs/OMC/GCE electrode and enhances its electrochemical response.The linear working range of the sensor for capsaicin detection is 0.16～38.4 μmol/L,and the detection limit is 0.034 μmol/L.In the actual sample detection,the recovery rate ofthe sensor spiked reached 95.40-103.00%,reflecting the Good accuracy.It is expected to be used as a new analytical method in the related fields of capsaicin analysis.