Fig. 4. Schematic representation of μPAD paper microfluidic device. (a) (i) Concept of μPAD-positive control (PC), negative control (NC), analyte pad (AP), (ii) dimensions and (iii) fabrication of the paper device; (b) (i) the color development after spiking Afl B1 in water and (ii) color development in presence of AflB1/no change in color in presence of ochratoxin in water.
