Portable Bioactive Paper-Based Sensor for Quantification of Pesticides

Figure 3

The response of biosensor (a) at different substrate, (b) enzyme, or (c) Ellman’s reagent concentrations. In each experiment, ATCh, AChE, and DTNB were mixed and adsorbed into paper matrix. Their fixed concentrations were AChE 12 U/mL, DTNB 4 μg/mL, and ATChI 4 μg/mL. The lower panel in (a) shows pictures of paper sensor; upper row is performed with sensor mixture and lower row with control mixture (lacking the enzyme component).