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New Method for the Determination of the Half Inhibition Concentration (IC

50

) of Cholinesterase Inhibitors

Markéta KováĜováa, Karel Komersa,*, Šárka ŠtČpánkováb, Patrik PaĜíkc, and Alexander ýeganb

a Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic.

Fax: + 420 466 037 068. E-mail: karel.komers@upce.cz

b Department of Biological and Biochemical Sciences, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic

c Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic

* Author for correspondence and reprint requests

Z. Naturforsch. 68 c, 133 − 138 (2013); received February 14, 2012/February 4, 2013

A new and simple analytical method is described for the determination of the IC50 values of the inhibitors of the hydrolysis of acetylcholine (ACh) or acetylthiocholine (ATCh) by cholinesterases. The method is based on monitoring the time course of the pH value du- ring the uninhibited and inhibited reaction. It requires only a pH meter with a suitable pH measuring cell and a small thermostated stirred batch reactor. The method has been vali- dated for twelve different types of cholinesterase inhibitors. The determined IC50 values are comparable to those obtained by independent, more complicated, and expensive methods (Ellman´s and pH-stat).

Key words: Cholinesterase Inhibition, IC50, Determination

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