A Long-Term Stable Sensor Based on Fe@PCN-224 for Rapid and Quantitative Detection of H2O2 in Fishery Products.

Pei Hu,Zhentao Sun,Yunwen Shen,Yiwen Pan

doi:10.3390/foods10020419

Pei Hu, Zhentao Sun + Show 2 more

Open Access

https://doi.org/10.3390/foods10020419

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Abstract

Hydrogen peroxide (H2O2) has been reported to be used for the illegal treatment of fishery products in order to obtain “fake” freshness. Residues of H2O2 in food may be of toxicology concern. In this study, a nonenzymatic sensor was developed based on Fe@PCN-224 metal–organic frameworks wrapped by Nafion to detect H2O2 concentration. The hybrid structure of Fe@PCN-224 was fabricated by incorporated free FeIII ions into the center of PCN-224, which was ultra-stable due to the strong interactions between Zr6 and the carboxyl group. Scanning electron spectroscopy images exhibited that Nafion sheets crossed together on the surface of Fe@PCN-224 nanoparticles to form a hierarchical and coherent structure for efficient electron transfer. Electrochemical investigations showed that the Fe@PCN-224/Nafion/GCE possessed good linearity from 2 to 13,000 μM (including four orders of magnitude), low detection limits (0.7 μM), high stability in continuous monitoring (current remained nearly stable over 2300 s) and in long-term measurement (current decreased 3.4% for 30 days). The prepared nanohybrid modified electrode was effectively applied to H2O2 detection in three different fishery products. The results were comparable to those measured using photometrical methods. The developed electrochemical method has a great potential in detecting the illegal management of fishery products with H2O2.

Highlights

Nowadays, food quality control has become increasingly important due to the growing demand for high-quality and sanitary food [1,2]
The fishery products classified as the last category must be judged as not suitable for humans consumption and withdrawn from the market [6]
ZrClO2 ·8H2 O, benzoic acid, DMF, glucose, ascorbic acid, potassium dihydrogen phosphate, lithium carbonate, sodium phosphate monobasic dihydrate, sodium phosphate dibasic dodecahydrate, magnesium sulfate heptahydrate, and calcium chloride dehydrate were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China)

Summary

Introduction

Food quality control has become increasingly important due to the growing demand for high-quality and sanitary food [1,2]. Among a variety of foods, the freshness of fishery products is the most crucial commercial quality factor for consumers [3,4,5]. The Regulation (EC) N 2406/96 of the European Parliament and the Council defines four categories for fresh fish products. The fishery products classified as the last category must be judged as not suitable for humans consumption and withdrawn from the market [6]. Some illegal treatments on these products may simulate “fake” freshness, one of which is to use hydrogen peroxide (H2 O2 ). Illegal treatment with 0.5–0.8% H2 O2 aqueous solution has been reported [8], which causes whitening and “fresh” effects on fishery products due to the oxidation properties of H2 O2 [9,10]

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