The investigation of lipid films for the construction of biosensors has recently given the opportunity to manufacture devices to selectively detect a wide range of food toxicants, environmental pollutants and compounds of clinical interest. Biosensor miniaturization using nanotechnological tools has provided novel routes to immobilize various “receptors” within the lipid film. This chapter reviews and exploits platforms in biosensors based on lipid membrane technology that are used in food, environmental and clinical chemistry to detect various toxicants. Examples of applications are described with an emphasis on novel systems, new sensing techniques and nanotechnologybased transduction schemes. The compounds that can be monitored are insecticides, pesticides, herbicides, metals, toxins, antibiotics, microorganisms, hormones, dioxins, etc.

This study focused on a high photo catalyst activity of TiO2 in addition to bleaching of different types of dyes. Titanium dioxide Nano particles were successfully synthesized by sol Gel method, then the gel has been dried at 400°C to obtain TiO2 Nano powder. The synthesized Nano powder has been characterized by X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Ultraviolet spectroscopy (Uv-Vis). A system of photocatalytic with UV- lamp (365nm) to activate a thin layer of TiO2 particles on glass substrate was set up, and the effect of activated TiO2 on degradation of methyl orange and Eriochrom black T as a model of organic pollutants were investigated in ppm concentration over period time of 6 hours. The results shown that Titanium dioxide nanoparticle shows a high efficiency to degradation of dyes. The highest percentages were 95.69%, 97.96% for MO and EBT respectively.