A Sensitive Electrochemical Ascorbic Acid Sensor Using Glassy Carbon Electrode Modified by Molybdenite with Electrodeposited Methylene Blue.

Applied Biochemistry and Biotechnology
Yan ZhangDongping Tao

Abstract

A non-enzymatic amperometric sensor using natural molybdenite (MLN) electrodeposited with methylene blue (MB) has been fabricated and characterized and its analytical performances were investigated for the determination of ascorbic acid (AA). The surface morphology of the electrode modified by electrodeposited MB was studied by use of the Advanced Mineral Identification and Characterization System (AMICS) and laser confocal high-temperature scanning microscope (LCSM). The poly(MB) and MLN immobilized sensor showed good stability, reproducibility, sensitivity, and selectivity. It exhibited a linear performance range from 3 to 1000 μM, with a lower detection limit of 0.083 μM (signal/noise = 3) and short response time (< 5 s). No obvious decrease in the current was observed after 20 days storage. The methodology reproducibility of this sensor was 2.6%. It showed good anti-interference ability for the potential interfering compounds. The poly(MB) film not only can enhance the electron-transfer rate but also increase the lifetime of the sensor. This study demonstrated the applicability of natural molybdenite for the fabrication of non-enzymatic electrochemical AA sensor.

References

Feb 21, 2002·Biochimica Et Biophysica Acta·Oreste Arrigoni, Mario C De Tullio
Apr 4, 2013·ACS Nano·Yulu LiuZhenhua Ni
Oct 24, 2013·ACS Nano·Yichao WangKourosh Kalantar-Zadeh
Mar 30, 2016·Analytical and Bioanalytical Chemistry·Manjunatha Ganiga, Jobin Cyriac
Feb 13, 2019·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Rui ZhaoDongping Tao

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Citations

Nov 12, 2021·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Jifan ZhaoZhiqiang Zhang

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