Peroxidase-mimicking Activity of PCN-222(Fe) for Colorimetric Sensing of Acetylcholinesterase Activity and Inhibition

A colorimetric method for detection of acetylcholinesterase (AChE) activity and inhibition was developed using metal organic frameworks (i.e., PCN-222(Fe)) with peroxidase-like activity. The blue tetramethylbenzidine oxidized by PCN-222(Fe) fades due to the reduction by acetylthiocholine chloride produced from AChE catalysis. The detection method shows a linear range of 0.05 - 10 mU mL-1 and a detection limit of 0.03 mU mL-1 AChE. Average recoveries in serum samples varied from 93 to 115% and relative standard deviation (RSD) was lower than 4.9%.