Abstract: Disclosed is a medical diagnostic device for analyzing breath gases and/or skin emissions, including a highly sensitive sensing component for obtaining an emission concentration profile and a database of breath analysis profiles medical condition characteristics.

Abstract: Potassium ion (K+) is important in regulating normal cell function in the human body, specifically the heartbeat and the muscle function. It is important to be able to monitor potassium ion concentrations in human fluids. This invention describes a novel concept for a potassium ion biosensor that accurately, rapidly, and efficiently monitors the presence and records the concentration of potassium ions with high specificity, not only in serum and urine, but also in the sweat or even eye fluid. This specific biosensor design utilizes a nanomanufacturing technique, i.e. electrospinning, to produce advanced nano-bio-composites that specifically trace even minute quantities of potassium ions through the use of selective bio-receptors (ionophores) attached to high surface area nanofibers. Electroactive polymers are then employed as transducers to produce an electronic (rather than ionic) output that changes instantly with the change in K+ concentration.