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. 2019 Feb 17;19(4):817. doi: 10.3390/s19040817

Figure 1.

Figure 1

Emerging paper-based point-of-care (POC) devices for food safety analysis. (A) An integrated sample-to-answer paper-based colorimetric device was developed for the colorimetric detection of E. coli in contaminated food and drinks. Adapted with permission from [14] © Royal Society of Chemistry (2016). (B) A paper-based fluorescent device coupled with fluorescent quantum dots (QDs) and MIPs was introduced for the sensitive detection of phycocyanin (PC). Adapted with permission from [49] © ACS Publications (2017). (C) A paper-based electrochemical-colorimetric hybrid device was developed for multiplexed detection of food chemicals, including lead (II), cadmium (II) and copper (II) ions. Adapted with permission from [59] © Elsevier (2016). (D) A paper-based surface-enhanced Raman scattering (SERS) device was fabricated with the integration of graphene oxide (GO) and silver (Ag) nanoparticles for the detection of pesticide residues in foods. Adapted with permission from [61] © Royal Society of Chemistry (2018).