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The construction of a simple sensor for the simultaneous detection of nitrite and thiosulfate by heme catalysis

机译：用血红素催化同时检测亚硝酸盐和硫代硫酸盐的简单传感器的构建

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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 (NO _(2) ~(?) ) and thiosulfate (S _(2) O _(3) ~(2?) ) ions was observed. Under optimal operating conditions, the notable electrocatalytic abilities of a Heme/SPE sensor were detected for the oxidation of NO _(2) ~(?) and S _(2) O _(3) ~(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 NO _(2) ~(?) and S _(2) O _(3) ~(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 NO _(2) ~(?) and S _(2) O _(3) ~(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 NO _(2) ~(?) and S _(2) O _(3) ~(2?) in pickled juice and tap water using the simple sensor. These results showed that rapid and precise measurements for actual application in NO _(2) ~(?) and S _(2) O _(3) ~(2?) detection could be conducted in food samples, indicating a potential use in food safety.
机译：通过一步法制造了几种简单的传感器。通过将电活性化合物如β-环糊精（β-CD），血红素，多巴胺（DA）或Fc-ECG沉积到丝网印刷电极（SPE）上，同时检测亚硝酸盐（NO _（ 2）〜（？））和硫代硫酸盐（S _（2）o _（3）〜（2？））离子。在最佳操作条件下，检测到血红素/ SPE传感器的显着电催化能力，用于氧化NO _（2）〜（？）和S _（2）O _（3）〜（2？），具有显着峰值潜在的差异，通过SEM，CV和DPV进行了表征。为电流响应的距离为5.0-200.0μmol1〜（α1）和1.0-100.0μmoll〜（α1）的线性关系，对于NO _（2）〜（？）和s _（2 ）分别_（3）〜（2？）。测定检测的限制为1.67和0.33μmol1〜（α1），同时检测的敏感度分别表示为0.43和1.43μAμm〜（α1）cm〜（Δ2）。在检测到NO _（2）〜（？）和S _（2）O _（3）〜（2？）中，不观察到干扰常见离子。此外，平均回收率为96.0至104.3％和总R.S.D.发现在酸性果汁中检测没有_（2）〜（？）和S _（2）o _（3）〜（3）〜（3）〜（3）〜（2？）使用简单传感器自来水的少于3.1％。这些结果表明，在没有_（2）〜（α）和S _（2）O _（3）〜（3）〜（2〜）检测中，可以在食品样本中进行快速和精确的测量，表明潜在使用食品安全。

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