Molecular Logic Gate as a tool for the sensing of Lead in drinking water: a FRET-based sensor

Acriflavine (Af) and Rhodamine B (RB), two laser dyes, were tested for Fluorescence Resonance Energy Transfer (FRET). It was seen that the energy transfer efficiency from Af to RB is sensitive to the presence of Lead in clay dispersion. In the presence of Pb + 2 ions, the FRET efficiency of the dye pair decreases up to 47.2% in clay dispersion. We can build a photo-regulated molecular logic NOT gate using this characteristic. The existence of Lead in the test water can be realized by molecular logic gate.