Aptamer-mediated 'turn-off/turn-on' nanozyme activity of gold nanoparticles for kanamycin detectionElectronic supplementary information (ESI) available: Experimental details, the nanomaterial characterisation and chemical structure of aptamers and antibiotics. See DOI: 10.1039/c4cc07275h

A new ultrafast and highly sensitive 'turn-off/turn-on' biosensing approach that combines the intrinsic peroxidase-like activity of gold nanoparticles (GNPs) with the high affinity and specificity of a ssDNA aptamer is presented for the efficient detection of a model small molecule kanamycin. A new ultrafast and highly sensitive 'turn-off/turn-on' biosensing approach that combines the intrinsic peroxidase-like activity of gold nanoparticles (GNPs) with the high affinity and specificity of a ssDNA aptamer is presented.