Metallic nano-particles (NPs) supported by active carbon can be an excellent catalyst for reactions including enzymatically-produced species such as H2O2 and NADH (nicotinamide adenine dinucleotide, reduced form). Incorporation of unique characteristics of NPs into biosensor can enhance both sensitivity and selectivity. Over the years, we have developed a single use, disposable and screen printed biosensor platform technology [13-16]. In this development, a 2–5% by weight of iridium (actually iridium oxide) nano-catalyst is added to the active carbon forming the screen printable ink. This biosensor prototype can be used to detect enzymatically-produced H2O2 at a relatively low oxidation potential minimizing the potential interference by other species. The fabrication of this biosensor prototype has been described elsewhere