scholarly journals Determination of acrylamide in food using adsorption stripping voltammetry

2013 ◽  
Vol 31 (No. 4) ◽  
pp. 401-406 ◽  
Author(s):  
H. Veselá ◽  
E. Šucman
Keyword(s):  
Stripping Voltammetry ◽  
Peak Height ◽  
Electrochemical Determination ◽  
Standard Reference Materials ◽  
Water Mixture ◽  
Electroanalytical Method ◽  
Sample Preparation Procedure ◽  
Ultrasound Bath ◽  
Voltammetric Measurements

A new electroanalytical method for the determination of acrylamide in food has been developed. It was found that a complex of acrylamide and Ni<sup>2+</sup> is suitable for the electrochemical determination of acrylamide. Ammonia buffer of pH&nbsp;= 9.5 was found to provide convenient conditions for the determination. optimal concentration of Ni<sup>2+</sup> was 500&nbsp;&micro;mol/l. The sample preparation procedure was optimised. The best results were found for an ethanol/water mixture (1:2) and pH = 1.4. The samples were extracted in an ultrasound bath, and after centrifugation 0.2 ml of the extract was taken for the measurement. Voltammetric measurements were done using the hanging mercury drop electrode. The peak height was a function of acrylamide concentration and deposition time. The accuracy of the method was verified by the use of standard reference materials. &nbsp;

scholarly journals Determination of acrylamide in dry feedstuff for dogs and cats

2013 ◽  
Vol 82 (2) ◽  
pp. 203-208 ◽  
Author(s):  
Helena Veselá ◽  
Emanuel Šucman
Keyword(s):  
Analytical Procedure ◽  
Low Cost ◽  
Stripping Voltammetry ◽  
Standard Reference Materials ◽  
Hanging Mercury Drop Electrode ◽  
Analytical Technique ◽  
Voltammetric Measurement ◽  
Relative Standard ◽  
Ultrasound Bath

Acrylamide is considered to be an endogenous contaminant of food and feedstuff. Attention is paid to the acrylamide content in human nutrition products; however, there is lack of data about its concentrations in feedstuff. The aim of this study was to use a newly developed adsorptive stripping voltammetry procedure for determination of acrylamide concentrations in five and three different kinds of dog and cat dry feedstuff, respectively. The applied analytical procedure consists of a solvent extraction in ultrasound bath, followed by voltammetric measurement at the hanging mercury drop electrode in ammonia buffer. The accuracy of the method was verified by use of standard reference materials. The range of acrylamide concentration found in samples of dry dog and cat feedstuff ranged from 106 to 358 μg/kg, and from 66 to 269 μg/kg, respectively. The precision of analyses expressed in form of the relative standard deviations ranged between 0.6–1.7%. The voltammetric procedure appears to be a reliable, sensitive, rapid and low-cost analytical technique for the determination of acrylamide in food and feedstuff. The concentrations of acrylamide found in feedstuff were relatively moderate but it is undoubtedly necessary to monitor its concentrations in future.

scholarly journals The effect of tamoxifen on the electrochemical behavior of Bi+3/Bi on the glassy carbon electrode and its determination via differential pulse anodic stripping voltammetry

2019 ◽  
Vol 63 (1) ◽  
Author(s):  
Mehdi Jalali ◽  
Zeinab Deris Falahieh ◽  
Mohammad Alimoradi ◽  
Jalal Albadi ◽  
Ali Niazi
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Peak Height ◽  
Carbon Electrode

The electrochemical behavior of Bi+3 ions on the surface of a glassy carbon electrode, in acidic media and in the presence of tamoxifen, was investigated. Cyclic voltammetry, chronoamperometry, differential pulse voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy with energy-dispersive X-ray spectroscopy were used to find the probable mechanism contributing to the reduction of the peak height of bismuth oxidation with an increase in the concentration of tamoxifen. The obtained results show a slight interaction between the bismuth species and tamoxifen which co-deposit on the surface of glassy carbon electrode. Therefore, the reduction in the peak height of bismuth oxidation as a function of tamoxifen concentration was used to develop a new differential pulse anodic striping voltammetry method for determination of trace amount of tamoxifen. The effects of experimental parameters on the in situ DPASV of Bi+3 ions in the presence of tamoxifen shown the optimal conditions as: 2 mol L-1 H2SO4 (1% v v-1 MeOH), a deposition potential of -0.5 V, a deposition time of 60 s, and a glassy carbon electrode rotation rate of 300 rpm. The calibration curve was plotted in the range of 0.5 to 6 µg mL-1 and the limits of detection and quantitation were calculated to be 3.1 × 10-5 µg mL-1 and 1.0 × 10-4 µg mL-1, respectively. The mean, RSD, and relative bias for 0.5 µg mL-1 (n=5) were found to be 0.49 µg mL-1, 0.3%, and 2%, respectively. Finally, the proposed method was successfully used for the determination of tamoxifen in serum and pharmaceutical samples.

scholarly journals Voltammetric method for ultra-trace determination of total mercury and toxic metals in vegetables. Comparison with spectroscopy

2013 ◽  
Vol 11 (5) ◽  
pp. 790-800 ◽  
Author(s):  
Clinio Locatelli ◽  
Dora Melucci
Keyword(s):  
Total Mercury ◽  
Anodic Stripping Voltammetry ◽  
Standard Addition ◽  
Stripping Voltammetry ◽  
Standard Reference Materials ◽  
Safety Control ◽  
Legal Limits ◽  
Pre Treatment ◽  
Ultra Trace

AbstractA new procedure for the determination of mercury(II), copper(II), lead(II), cadmium(II) and zinc(II) traces in food matrices by square wave anodic stripping voltammetry and standard addition method is proposed. A rapid, inexpensive and multi-analyte analytical method suitable for food safety control is provided. Comestible vegetables were chosen as samples. A two-step, sequential determination was defined, employing two working electrodes: a gold electrode (GE) for mercury(II) and copper(II), and subsequently a hanging mercury drop electrode (HMDE) for copper(II), lead(II), cadmium(II) and zinc(II). No sample pre-treatment was needed. Spinach leaves, tomato leaves and apple leaves were employed as standard reference materials to optimize and defined the analytical procedure. The new method shows good selectivity, sensitivity, detectability and accuracy. A critical comparison with spectroscopic measurements is discussed. Spinach, lettuce and tomato samples sold on the market were analysed as real samples. Lead(II) and cadmium(II) concentration exceeded the relevant legal limits.

Electrochemical determination of low blood lead concentrations with a disposable carbon microarray electrode

1995 ◽  
Vol 41 (4) ◽  
pp. 557-563 ◽  
Author(s):  
B J Feldman ◽  
A D'Alessandro ◽  
J D Osterloh ◽  
B H Hata
Keyword(s):  
Graphite Furnace ◽  
Anodic Stripping Voltammetry ◽  
Blood Lead ◽  
Standard Addition ◽  
Stripping Voltammetry ◽  
Electrochemical Determination ◽  
Graphite Furnace Atomic Absorption ◽  
Order Of Magnitude ◽  
S Deposition

Abstract Lead concentrations in blood samples typical of unexposed individuals are determined by using square-wave anodic stripping voltammetry at a disposable 287-element (15-35-microns diameter) carbon microarray electrode. Analysis of a series of low Pb-containing samples (blood [Pb] = 17 to 92 micrograms/L) by standard addition gives good accuracy (average bias vs graphite furnace atomic absorption spectroscopy = -4 micrograms/L) and precision (pooled SD = 7 micrograms/L). The signal/noise ratio is improved by about an order of magnitude over that found at a single carbon disk (10 microns diameter), resulting in a detection limit (for the microarray) of 5 micrograms/L for a 60-s deposition of sample.

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