Electrochemical sensing of L-histidine based on structure-switching DNAzymes and gold nanoparticle–graphene nanosheet composites.

A sensitive aptasensor for detection of l-histidine based on the switching structure of aptamer and gold nanoparticles–graphene nanosheets (GNPs–GNSs) composite was reported for the first time. The fabricated biosensor shows an expanded linear range, excellent sensitivity and selectivity against other amino acids. [ABSTRACT FROM AUTHOR]