Description_x000D_ General description_x000D_ 1,1-Dimethyl-4-acetylthiomethylpiperidinium iodide (MATP+) is a substrate for analysis of acetylcholinesterase (AChE) activity. MATP+ is highly selective for specific detection of AChE activity, and thus is advantageous over other AChE substrates like acetylcholine, which can react with multiple enzymes like AChE and also butylcholinesterase (BChE). Thus with MATP+ in the AChE assay, there is no need to include BChE inhibitors in the protocol.