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Owing to the ever-increasing demand in food safety and quality analysis, simple and rapid sensing devices for detection of various foodborne contaminants have been comprehensively studied. Recently, paper-fluidic-based devices have proven themselves as a promising type of sensor in terms of cost, specificity, sensitivity and so forth. Compared with conventional laboratory-based sensing methods, bulky equipment and adept personnel are no longer indispensable as capillary action could take over complicated flow control involved in traditional methods. Moreover, numerous fabrication methods have been developed, and various commonly used mechanisms have been realized on paper-fluidic devices. This chapter first introduces the general developments in the field, and then discusses representative applications of using paper-fluidic devices for detecting different contaminants such as food pathogens, herbicides and additives. It is foreseeable that paper-based sensing devices will become one of the quotidian products in daily life.

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