Acetylcholinesterase from electric eel type VI-S, butyrylcholinesterase from equine serum, acetylthiocholine iodide (ATCI), butyrylthiocholine iodide (BTCI), 5,5′-dithiobis[2-nitrobenzoic acid] (DTNB), bovine serum albumin (BSA), tris buffer, and galantamine were purchased from Sigma–Aldrich. The organic solvents (methanol and ethanol) and reagents used in the analysis were of analytical grades.
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