Abstract: A zinc oxide-carbon nanotube composite is provided, the nanotube composite being selective and sensitive for detection of hydrogen peroxide, which is important for screening for early cancer detection, monitoring cardiovascular disease, detecting onset of food spoilage, and enzymatic reactions that produce hydrogen peroxide as a byproduct. Also provided are methods using said zinc oxide-carbon nanotube composite.

Abstract: Systems and methods are provided for detecting and quantitating one or more compounds or molecules in a sample. An aptamer-based point-of-care device (such as a strip) is described for rapid detection of target molecules such as the cancer marker p-glycoprotein (Pgp). Fluorescent molecules or gold nanoparticles may be used to detect the binding between a target molecule and the aptamer. By way of example, fluorescence resonance energy transfer (FRET) or Dynamic Light Scattering (DLS) may be used for detecting the physical and/or chemical changes caused by the binding of the aptamers to the target molecules.