Method for measuring amaranth by utilizing expanded graphite paste electrode

Abstract

The invention relates to a method used for measure amaranth by utilizing expanded graphite paste electrode, and belongs to the technical field of electrochemical analysis detection. The method comprises the following steps of: firstly, respectively placing a work electrode expanded graphite paste electrode, a reference electrode saturated calomel electrode and an auxiliary electrode platinum wire electrode in Boehret-Robinson BR buffer solutions ( for short BR buffer solution) with different amaranth concentrations; adopting a square wave volt-ampere technology to operate so as to obtain an oxidizing peak current value of the amaranth, wherein the oxidizing peak current value and the concentration of the amaranth have a good linear relationship; and measuring an oxidizing peak current value of a sample solution by using the same method, so as to obtain the concentration of the amaranth in the sample according to a standard curve and a corresponding equation of linear regression. The method provided by the invention has the advantages that the operation is simple and convenient, the convenience and the fastness can be realized, the detection cost is low, the sensitivity is high, the stability and the reproducibility are good, and meanwhile, the direct detection on the amaranth is realized.

Description

technical field [0001] The invention relates to an electrochemical analysis and testing method, in particular to a method for electrochemical analysis and detection of amaranth. Background technique [0002] Amaranth is a synthetic azo pigment, which is widely added to wine, candy, syrup and other foods due to its bright color. According to the hygienic standard for the use of food additives in my country (GB 2760-1996), the average daily intake (ADI) of amaranth is between 0mg Kg -1 and 0.5mg Kg -1 between. However, excessive consumption will cause high genotoxicity, cytotoxicity and other hazards. [0003] At present, the inspection and detection techniques of amaranth at home and abroad mainly include high performance liquid chromatography, fluorescence method, spectrophotometry and so on. Although the detection accuracy of these methods is high, the sample pretreatment is complicated, the instruments are expensive, professional operators are required, and it takes a ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a simple, fast, low-cost, high-cost method for the detection methods of amaranth in existing foods that mostly require large-scale experimental instruments and harsh experimental operating conditions, sample pretreatment is complicated, and the cost is high. An electrochemical method for the detection of amaranth with high sensitivity, stability and reproducibility

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