Electrochemical imprinted sensor for determination of oleanic acid based on poly (sodium 4-styrenesulfonate-co-acrylic acid)-grafted multi-walled carbon nanotubes-chitosan and cobalt hexacyanoferrate nanoparticles

► We developed a highly sensitive and selective electrochemical sensor. ► MWNTs-PSS-CTS film and CoHCNFe act as signal amplification materials. ► The proposed sensor displayed excellent sensitivity and selectivity towards OA. ► It could be applied for determination in real samples successfully.