The integration of CNT, PEI and Cu allows the robust deposition at GCE.
The complex formation between amino acids and Cu facilitates the dissolution of Cu.
GCE/CNT–Cu-PEI allows the detection of electroactive and non-electroactive amino acids.
Amino acids quantification can be done at low potential and physiological pH.
The presence of Cu and CNT allows the sensitive amperometric detection of glucose.