Nano sensors for chemicals, toxins and contaminants
- Only foods that are fresh and without any harmful substances and contaminants can be considered safe for consumption. Because of this, process analysis and product quality control are necessary for the food industry. Various chemical and biological nanosensors are available for detecting different types of chemicals.
- An electronic instrument called an “electronic nose” was developed using fragrance-detecting methods, with an olfactory system similar to mammals that can detect smells.
- The fundamental component of an electronic nose is a gas sensor that detects changes in odour or flavour type, quality, and amount. Due to their larger surface area than macroscopic particles, nanoparticles aid in improved gas absorption on sensor surfaces [3].
- By functionalizing a carboxylated polypyrrole nanotube field-effect transistor with the human taste receptor protein, hTAS2R38, a nano bio electronic tongue sensor for bitter taste detection, has been created. Surprisingly, the nano tongue could detect target bitterness chemicals phenylthiocarbamide and propylthiouracil with effectiveness comparable to humans [4].
- Recently, studies on silver nanoparticles were conducted that can detect pesticides on apples within minutes, but they still need to be validated in large-scale studies [5].