A device for capturing and concentrating volatile organic compounds (VOCs) in a sample of breath air. The device includes an intake for accepting an air sample a disposable mouth piece a sensor array for measuring physical parameters of the air sample an exhaled air sampler for capturing a pre-determined volume of air a concentrator for concentrating VOCs in the air sample and an ionic liquid collector, the latter of which may be removed from the device. The ionic liquid collector, which may have one compartment or multiple compartments, includes at least one ionic liquid. Analysis of VOCs in the ionic liquid or liquids may identify biomarkers that can provide a medical diagnosis for a human patient based on a sample of breath air.
