BCHE and Alzheimer disease: AChE and butylcholinesterase (BChE) hydrolyse ACh within the synaptic cleft [5]; therefore, one of the possible therapeutic strategies entails the use of AChE [6,7], which, according to the cholinergic theory, results in the elevation of the acetylcholine concentration in the brain and, therefore, improvement of the cognitive function in AD patients [8,9].