Enhanced electrochemical detection of iodide at a reduced graphene oxide-modified carbon electrode in iodized salts

Mohd Azerulazree Jamilan; Jaafar Abdullah; Shahrul Ainliah Alang Ahmad; Mohd Fairulnizal Md Noh

doi:10.1016/j.foodchem.2022.133382

Enhanced electrochemical detection of iodide at a reduced graphene oxide-modified carbon electrode in iodized salts

Food Chem. 2022 Nov 1:393:133382. doi: 10.1016/j.foodchem.2022.133382. Epub 2022 Jun 2.

Authors

Mohd Azerulazree Jamilan¹, Jaafar Abdullah², Shahrul Ainliah Alang Ahmad³, Mohd Fairulnizal Md Noh⁴

Affiliations

¹ Nutrition, Metabolism and Cardiovascular Research Centre, Institute for Medical Research, National Institutes of Health, Ministry of Health Malaysia, No. 1, Jalan Setia Murni U13/52, Setia Alam, 40170 Shah Alam, Selangor D.E., Malaysia; Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia.
² Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia; Institute of Nanoscience and Nanotechnology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia. Electronic address: jafar@upm.edu.my.
³ Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia; Institute of Nanoscience and Nanotechnology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia.
⁴ Nutrition, Metabolism and Cardiovascular Research Centre, Institute for Medical Research, National Institutes of Health, Ministry of Health Malaysia, No. 1, Jalan Setia Murni U13/52, Setia Alam, 40170 Shah Alam, Selangor D.E., Malaysia.

PMID: 35667176
DOI: 10.1016/j.foodchem.2022.133382

Abstract

In this study, enhancement of electrochemical performance of electrochemically reduced graphene oxide (ERGO) on a screen-printed carbon electrode (SPCE) (ERGO/SPCE) coupled with ion-pairing (cetyltrimethylammonium bromide, CTAB) for the determination of iodide in table salt has been described. The electrode modification of ERGO/SPCE was conducted using cyclic voltammetric (CV) scanning in the potential range of 1.3-0.4 V for 50 cycles after the drop-casting of graphene oxide (GO) suspension on the SPCE. It was found that the electro-active surface area of ERGO/SPCE was increased by 1.5-fold compared to the bare SPCE. ERGO/SPCE sensor displays linearity towards iodide in the concentration range from 0.020 to 1.0 mg/L (sensitivity = 5.40 µA(mg/L)^-1, R² = 0.9906) with the limit of detection (LOD) and limit of quantitation (LOQ) of 0.070 mg/L and 0.21 mg/L, respectively. The comparison between polarography and ERGO/SPCE sensor was in good agreement.

Keywords: Electrochemical; Iodide; Ion-pairing; Reduced graphene oxide; Salt sample.

MeSH terms

Carbon*
Electrochemical Techniques
Electrodes
Graphite*
Iodides
Salts
Sodium Chloride, Dietary

Substances

Iodides
Salts
Sodium Chloride, Dietary
graphene oxide
Carbon
Graphite