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In this work, we developed an electrochemical aptasensor by using methylene blue (MB) redox probe labeled aptamer as a signaling fragment and functional graphene oxide (FGO) as the signal-enlarging platform. The role of functionalized graphene oxide was not mere to serve as a covalent immobilization support for aptamer sequences, but its catalytic signal amplification behavior towards methylene blue...
A novel electrochemical immunosensor for sensitive detection of ochratoxin A (OTA) was reported. An electrochemical and chemical reaction protocol was elaborated to modify the gold electrode. A screen-printed gold electrode (SPGE) was modified with a layer of 4-nitrophenyl, assembled from 4-nitrophenyl diazonium salt synthesized in situ in acidic aqueous solution. Next, the nitro groups were electrochemically...
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