title: High-performance liquid chromatography with on-line coupled UV, mass spectrometric and biochemical detection for identification of acetylcholinesterase inhibitors from natural products.
abstract: A high-performance liquid chromatography (HPLC) method with on-line coupled ultraviolet (UV), mass spectrometry (MS) and biochemical detection for acetylcholinesterase (AChE) inhibitory activity has been developed. By combining the separation power of HPLC, the high selectivity of biochemical detection, and the ability to provide molecular mass and structural information of MS, AChE inhibitors can be rapidly identified. The biochemical detection was based on a colorimetric method using Ellman's reagent. The detection limit of galanthamine, an AChE inhibitor, in the HPLC-biochemical detection is 0.3 nmol. The three detector lines used, i.e., UV, MS and Vis for the biochemical detection were recorded simultaneously and the delay times of the peaks obtained were found to be consistent. This on-line post-column detection technique can be used for the identification of AChE inhibitors in plant extracts and other complex mixtures such as combinatorial libraries.
authors.affiliation: Division of Pharmacognosy, Leiden/Amsterdam Center for Drug Research, Gorlaeus Laboratories, Leiden University, The Netherlands.
authors.forename: K
authors.initials: K
authors.lastname: Ingkaninan
authors.forename: C M
authors.initials: CM
authors.lastname: de Best
authors.forename: R
authors.initials: R
authors.lastname: van der Heijden
authors.forename: A J
authors.initials: AJ
authors.lastname: Hofte
authors.forename: B
authors.initials: B
authors.lastname: Karabatak
authors.forename: H
authors.initials: H
authors.lastname: Irth
authors.forename: U R
authors.initials: UR
authors.lastname: Tjaden
authors.forename: J
authors.initials: J
authors.lastname: van der Greef
authors.forename: R
authors.initials: R
authors.lastname: Verpoorte
mesh_terms: D000110:Acetylcholinesterase / Q000187:drug effects*; D002800:Cholinesterase Inhibitors / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D013058:Mass Spectrometry; D010944:Plants / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002800:Cholinesterase Inhibitors; D000110:Acetylcholinesterase