Dimitrios Nikolelis received his PhD from the University of Athens in 1976 and is a professor of analytical and environmental chemistry at the University of Athens. He is the Editor of many scientific journals and has authored ca. 200 scientific articles. He is also the Editor of five books. His research is targeted on the fabrication of portable biosensors used for the detection of food toxicants and environmental pollutants such as hydrazines, dioxins, insecticides, toxins, etc. Georgia Paraskevi Nikoleli received her PhD from the National Technical University of Athens in 2015 and is currently a scholar at the University of West Attica, Greece. She has authored ca. 80 scientific articles and she is the Editor of two books. Her research is focused on the construction of portable nanosensors used for the detection of food toxicants and environmental pollutants.