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- W1999998565 abstract "An immobilised acetylcholinesterase (AChE) stationary phase was prepared by using an in situ AChE immobilisation procedure. A stainless steel column packed with epoxide silica was connected to the HPLC system and the enzyme solution at pH 5.8 was recycled through the column at a flow-rate of 0.5 ml/min for 24 h. The activity of the immobilised AChE was determined by injecting the substrate acetylthiocholine, using as mobile phase 0.1 M phosphate buffer (pH 7.4) containing Ellman's reagent [5,5'-dithio-bis(2-nitrobenzoic acid)] and measuring the area of the obtained peak with UV detection at 412 nm. The effect of AChE inhibitors tacrine, edrophonium and donepezil were evaluated by the simultaneous injection of each inhibitor with the substrate. The resulting decrease in the AChE activity, as expressed by the decrease of the peak area detected at 412 nm, was related to the concentration and potency of the solutes. The obtained IC50 values were compared with those derived by the conventional spectrophotometric method. This immobilized enzyme reactor, included in a chromatographic system, can be used for the rapid screening for new inhibitors allowing for the on-line determination of a compound's inhibitory potency. The advantages over the conventional methods are the increased enzyme stability and system automation which allows a large number of compounds to be analysed continuously." @default.
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- W1999998565 date "2001-04-01" @default.
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- W1999998565 title "Determination of inhibitors’ potency (IC50) by a direct high-performance liquid chromatographic method on an immobilised acetylcholinesterase column" @default.
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- W1999998565 doi "https://doi.org/10.1016/s0378-4347(00)00571-5" @default.
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