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| | Inhibition Assay |
| Description: | The inhibitory activity of the enzyme acetylcholinesterase (AChE) was evaluated by the Ellman method (Biochem. Pharmacol. 1961, 7, 88) using an electric eel as an AChE neuronal model (Electrophorus electricus) and acetylthiocholine iodide (0.35 mM) as substrate. The reaction took place in a final volume of 3 mL of a 0.1 M phosphate buffer solution, pH 8.0, containing 0.035 units of AChE and used a 0.35 mM solution of 5,5'-dithio-bis(2-nitrobenzoic acid) (DTNB) to produce the 5-thio-2-nitrobenzoic acid anion. Inhibition curves were performed in triplicate by incubating at least nine inhibitor concentrations for 10 min. A triplicate sample without inhibitor was always present so as to be aware of 100% of the AChE activity. After this time, the substrate was added to 0.35 mM acetylthiocholine iodide, from a 10 mM stock solution. Loss of color was observed at 412 nm in a spectrophotometric reader having 96 well plates. |
| Affinity data for this assay | |
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