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Pheromone Detection Using Odorant Binding Protein Sensors

General Odorant Binding Protein 2 (GOBP2) and Pheromone Binding Protein 1 (PBP)1 of the silk moth Bombyx mori were synthesized for the purpose of developing biosensors for agricultural applications. The affinity of binding of the PBP1 and the GOBP2 against the pheromones bombykol and bombykal was tested in in solution using competitive binding assays with the fluorescence probe 1-NPN. The proteins were immobilized on to quartz crystal microbalances using a self-assembled monolayer with covalent bonding. The devices were able to detect and distinguish the pheromones in the vapor phase at ppb concentrations.