The rapid discovery of highly active butyrylcholinesterase (BChE) inhibitors is key to the treatment of the late stages of Alzheimer's disease. Herein, a colorimetric cellulose membrane (CM)-based biosensor was developed. The CM was employed as a carrier, which can be immobilized with the BChE and 5,5'-dithio-(2-nitrobenzoic acid) (DTNB) to prepare the biosensor for the solid-phase enzyme-catalyzed reaction. Specifically, the CM was oxidized to the oxidized cellulose membrane (OCM), which can further covalently bind the BChE to prepare the BChE-immobilized cellulose membrane (BCM). Then, the DTNB was adsorbed to the BCM to prepare the BDCM biosensor. The BDCM biosensor can visually detect S-butyrylthiocholine iodide at the yellow light signal with several characters, including sensitivity (LOD 1.56 μM), affinity (Km = 140.48 ± 5.42 μM), stability (over 1 month), via the BChE-catalyzed solid-phase reaction. Furthermore, the BDCM biosensor was applied to screen and determine the specific commercial BChE inhibitors tacrine and rivastigmine, with the IC50 values of 30.99 ± 12.20 nM and 2.02 ± 0.13 μM, respectively, from 13 different commercial inhibitors. This work provided a new method of visual BChE inhibitor screening and a useful strategy for the design of enzyme-based immobilization technology cellulose membrane biosensors.
Keywords: Biosensor; Butyrylcholinesterase; Cellulose membrane.
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