Fig. 4From: The determination of Ochratoxin A based on the electrochemical aptasensor by carbon aerogels and methylene blue assisted signal amplificationThe DPV of the CAs-cDNA/apt/AuE in Tris–HCl buffer after incubated in 0.02 μM MB. (a) 0 ng/mL OTA, (b) 10 ng/mL OTABack to article page