A novel aptasensing method for detecting bisphenol A using the catalytic effect of the FeO/Au nanoparticles on the reduction reaction of the silver ions.

The gold electrode was functionalized with anti-bisphenol A (BPA) aptamer and captured the BPA as analyte. By dropping the aptamer-modified magnetic FeO/Au nanoparticles solution onto the electrode, a BPA molecule attaches to many aptamers that are in contact with a large number of FeO/Au nanoparticles. The modified electrode were transferred to a solution containing Ag ions.