Metal ion mediated imprinting for electrochemical enantioselective sensing of l-histidine at trace level

Enantioselective trace level sensing of l-histidine (limit of detection, 1.980 ng mL−1, S/N = 3) was feasible with the use of a typical, reproducible, and rugged complex imprinted polymer-based pencil graphite electrode, in aqueous samples. In the present instance, the Cu2+ ion-mediated imprinting of l-histidine in an molecularly imprinted polymer motif actually helped upbringing electrocatalytic activity to respond an enhanced differential pulse anodic stripping voltammetric oxidation peak of l-histidine, without any cross-reactivity and false-positive, in real samples. The proposed sensor could be considered suitable for the practical applications in biomarking histedinemia, a disease associated with l-histidine metabolic disorders, in clinical settings.