Fig. 1.

a Schematic representation of a MonoNose device for measuring bacterial volatile organic compound (VOC) production in the broth’ headspace over prolonged periods of time. The sensor is a commercially available metal oxide-based micro-device. b Experimental set-up with 30 MonoNose devices in operation in an incubator. The sensors are serially connected and all data are assembled on a simple portable computer. The vials in the photo are standard BD-BACTEC™–Plus-Anaerobic/F disposable bottles