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Mesoporous Tungsten Oxides with Crystalline Framework for Highly Sensitive and Selective Detection of Foodborne Pathogens

Zhu, Yongheng, Zhao, Yong, Ma, Junhao, Cheng, Xiaowei, Xie, Jing, Xu, Pengcheng, Liu, Haiquan, Liu, Hongping, Zhang, Haijiao, Wu, Minghong, Elzatahry, Ahmed A., Alghamdi, Abdulaziz, Deng, Yonghui, Zhao, Dongyuan
Journal of the American Chemical Society 2017 v.139 no.30 pp. 10365-10373
Listeria monocytogenes, acetic acid, biomarkers, catalytic activity, food pathogens, food safety, foods, microbial contamination, microbial detection, porous media, public health, tungsten oxide, volatile organic compounds
Foodborne pathogens like Listeria monocytogenes can cause various illnesses and pose a serious threat to public health. They produce species-specific microbial volatile organic compounds, i.e., the biomarkers, making it possible to indirectly measure microbial contamination in foodstuff. Herein, highly ordered mesoporous tungsten oxides with high surface areas and tunable pores have been synthesized and used as sensing materials to achieve an exceptionally sensitive and selective detection of trace Listeria monocytogenes. The mesoporous WO₃-based chemiresistive sensors exhibit a rapid response, superior sensitivity, and highly selective detection of 3-hydroxy-2-butanone. The chemical mechanism study reveals that acetic acid is the main product generated by the surface catalytic reaction of the biomarker molecule over mesoporous WO₃. Furthermore, by using the mesoporous WO₃-based sensors, a rapid bacteria detection was achieved, with a high sensitivity, a linear relationship in a broad range, and a high specificity for Listeria monocytogenes. Such a good gas sensing performance foresees the great potential application of mesoporous WO₃-based sensors for fast and effective detection of microbial contamination for the safety of food, water safety and public health.