METHOD OF VOLTAMMETRIC DETERMINATION OF FOOD SYNTHETIC DYE "RED CHARMING AC" AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2024 - IPC G01N27/48 

FIELD: food and analytical chemistry.

SUBSTANCE: invention relates to the electrochemical methods of analysis, and can be used for the voltammetric determination of the food synthetic azo dye “red charming AC” (E129) in drinks in order to control their safety and quality. A method of voltammetric determination of the food synthetic dye “red charming AS” in drinks includes immersing an electrochemical device based on a modified carbon fiber material in a solution of a background electrolyte with the test sample, preliminary electrochemical concentration of the dye on the surface of the device, recording an analytical signal proportional to the concentration of the dye in a differential pulse mode, and the device is kept in an electrochemical cell in a phosphate buffer solution with pH 4 as a background electrolyte at a potential of +1.1 V for 20 s, then the dye is concentrated on the surface of a carbon fiber material modified with a microsuspension of Karelian shungite at a potential of +0.2 V in a phosphate-buffer solution with pH 4 for 20 s, the background voltammetric signal is recorded with differential pulse parameters: pulse amplitude of 100 mV, pulse duration of 0.025 s, potential scanning speed of 50 mV/s, introduced into cell of 0.1 ml of the test sample and record the voltammogram under the same differential-pulse parameters, then record the voltammogram of the sample with the addition of a standard solution of the “red charming AC” dye and record the voltammogram under the same differential-pulse parameters, while the concentration of the dye in the sample is assessed using the additive method. A device for implementing the method described above is also proposed.

EFFECT: invention is aimed at reducing the labor intensity of the sensor manufacturing technology, improving the analytical characteristics of the sensor by changing the composition of the modifying layer of the sensor and the conditions for concentrating and recording the analytical signal.

2 cl, 8 dwg