Detection of odorant molecules via surface acoustic wave biosensor array based on odorant-binding proteins

► Sensor array of three surface acoustic wave biosensors and one reference is proposed. ► Three different odorant-binding proteins deposited on three SAW resonators. ► A sensor system with electronic oscillators and sealed chamber was fabricated. ► Detection of small concentrations of octenol and carvone vapours in air. ► From the comparison of the sensitivities of the OBPs they resulted to be different