The construction of a simple sensor for the simultaneous detection of nitrite and thiosulfate by heme catalysis. Issue 58 (22nd September 2020)

• Record Type: Journal Article
• Authors: Han, Guo-Cheng; Li, Huifang; Ferranco, Annaleizle; Tao Zhan, ; Cheng, Yunyun; Chen, Zhencheng; Xue, Mingyue; Feng, Xiao-Zhen; Kraatz, Heinz-Bernhard
• Is Part Of: RSC advances. Volume 10:Issue 58(2020)
• Page Start: 35007
• Page End: 35016
• Publication Date: 2020-09-22
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra06942f
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Several simple sensors were fabricated through a one-step method. Abstract : Several simple sensors were fabricated through a one-step method. By depositing electro-active compounds, such as β-cyclodextrins (β-CD), heme, dopamine (DA), or Fc-ECG, onto a screen-printed electrode (SPE), the successful simultaneous detection of nitrite (NO2 − ) and thiosulfate (S2 O3 2− ) ions was observed. Under optimal operating conditions, the notable electrocatalytic abilities of a Heme/SPE sensor were detected for the oxidation of NO2 − and S2 O3 2−, with remarkable peak potential differences, after characterization via SEM, CV, and DPV. Linear relationships were obtained in the ranges of 5.0–200.0 μmol L −1 and 1.0–100.0 μmol L −1 for the current response versus concentration of NO2 − and S2 O3 2−, respectively. The limits of detection were determined to be 1.67 and 0.33 μmol L −1 while the sensitivities of detection were noted to be 0.43 and 1.43 μA μM −1 cm −2, respectively. During the detection of NO2 − and S2 O3 2−, no interfering common ions were observed. Furthermore, average recoveries from 96.0 to 104.3% and a total R.S.D. of less than 3.1% were found for the detection of NO2 − and S2 O3 2− in pickled juice and tap water using the simple sensor. These results showed that rapid and precise measurements for actual application in NO2 − and S2 O3 2− detection could be conducted in food samples, indicating a potential use in food safety.