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Preliminary Study on Rapid Determination of Bisphenol A by Electrochemical Method

Author: ZhangYanLi
Tutor: LiZhongHai
School: Central South University of Forestry Science and Technology
Course: Of Food Science
Keywords: Bisphenol A Electrochemical Bare gold electrode Gold nanoparticles modified electrode Food cans
CLC: O657.1
Type: Master's thesis
Year: 2011
Downloads: 99
Quote: 1
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Abstract

Bisphenol A is an environmental endocrine disruptors, in addition to general toxicity, it also has estrogenic effects can mimic or interfere with endogenous estrogen play contemplated estrogenic effects. At low concentrations can organisms endocrine system, the nervous system, the immune system and other aspects have a negative impact, and even teratogenic, carcinogenic, mutagenic. Bisphenol A is one of the important raw material for the manufacture of epoxy resins, polycarbonate polymer materials, and therefore have a wide range of applications in food containers, packaging materials and wall coating. However, use of bisphenol A food packaging material in the process of use, cleaning will be a bisphenol A migrate and contaminate the contents. Foodborne contamination caused by the food packaging is one of the important ways of bisphenol A into the human body. At present, many countries and regions have called for a ban on the use of bisphenol A in food packaging. Rapid detection of bisphenol A content package is to reduce the harm of important measures. Methods for the detection of bisphenol A in food containers and packaging is a high-performance liquid chromatography and gas chromatography, the complex operation of these two methods, complex, costly analysis, is not conducive to the rapid real-time detection. And the use of a large number of organic solvents be operator health and environmental hazards. Electrochemical analysis method is fast, accurate, the suitable trace and trace analysis; electrochemical instruments device is simple, easy to implement automated continuous analysis, and low prices. Therefore, the rapid detection of bisphenol A electrochemical method. The main research work are as follows: (1) The experimental analysis of the bare gold electrode electrochemical behavior of bisphenol A, bisphenol A bare gold electrode is irreversible oxidation reaction and the proton and electron transfer number 2. Within the range of pH = 5-8, and the peak current at pH = 7 the response value at maximum; linear equation Vp (V) = 0.9183-0.0595pH The peak potential Vp and the pH within this range, R2 = 0.9987 in scanning speed v = 0.0025-0.16V / s range, the peak current with the square root of the scanning speed increase was linearly increasing relationship linear equation was I (μA) = 14.394v1 / 2 0.0071, R2 = 0.9994; the peaks potential and Ln (v) satisfies the linear equation Vp (V) = 0.0164Ln (v) .5834, R2 = 0.9804 in 4.39 10-6-4.39 x 10-mol / L, and 4.39 x 10-7-4.39 × 10-6mol / L, bisphenol A concentration and peak current response of a linear relationship. The detection limit of the method was 2.19 × 10 - 17 mol / L (S / N = 3) (2) in the gold nanoparticles modified electrode of bisphenol A, the peak current at pH = 7 appears at the maximum; at pH = 5-8 when linear equations the peak potential Vp and the pH found :0.9966-0 .0699 pH to Vp (V) (R2 = 0.9949). v = 0.005-0.16 V / s, the anodic peak potential of bisphenol A and Ln (v) comply with the linear equation Vp (V): 0.0203 Ln (v) 0.5916, R2 = 0.9915; oxidation peak current of bisphenol A and The scanning speed is the square root of a linear equation: I (μA) = 18.426v1/2-0.0853 R2 = 0.9909. Oxidation peak current and the concentration of 2.19 × 10-7-4.39 × 10-6mol / L range in line with the linear relationship: Ip = domain ranged from 0.6342 0.044c, R2 = 0.9946. The minimum detection limit of 1.10 × 10-8mol / L (S / N = 3). (3) Using the above established detection methods canned food simulant liquid were measured, the results were not detected bisphenol A. In addition to the beverage cans. Bare gold electrode as the working electrode, add concentration when 4.39μmol / L and 0.439μmol / L, the recoveries for :97.7-100.7%; gold nanoparticles modified electrode as the working electrode added concentration 0.219μmol / L when the recoveries :95.4-100 .5%. The relative standard deviation of the measured values ??are less than 5%, the detection method is suitable for food cans of bisphenol A.

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