Matrix-assisted laser desorption/ionization mass spectrometry (MALDI TOF MS) study of Huperzine A, a natural anti-Alzheimer's disease product, its derivatization and its detection by highly sensitive laser induced fluorescence (LIF)

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Authors

BEN HAMEDA Azdeen A. Abdullah TÁBORSKÝ Petr PENA-MENDEZ E. HAVEL Josef

Year of publication 2007
Type Article in Periodical
Magazine / Source Talanta
MU Faculty or unit

Faculty of Science

Citation
Web https://www.sciencedirect.com/science/article/pii/S0039914006007922?via%3Dihub
Doi http://dx.doi.org/10.1016/j.talanta.2006.12.010
Keywords Huperzine A; derivatization; MALDI TOF MS; CE-LIF
Description Huperzine A, a reversible acetylcholinesterase inhibitor for the treatment of Alzheimer disease (HupA), was studied using an (MALDI TOF MS) instrument in MALDI mode. The formation of a HupA dimmer in a vacuum was observed and several matrices were found that were able to inhibit its formation. The structures of the neutral and protonated form of the HupA molecule were calculated and optimized using a Hyperchem program. Detection limit using MALDI TOF MS in the model sample was 5.3 pg. MALDI TOF MS was also applied to the direct detection of the drug in medical preparations and in human serum. The limit of detection in plasma was 14.2 pg with a signal-to-noise ratio of 3:1. However, the sensitivity was not as high as it usually is in MALDI. Therefore, a new method for the derivatization of HupA was developed using fluorescent labelling with rhodamine B isothiocyanate (RBITC). A limit of detection using capillary electrophoresis laser induced fluorescence detection (CE-LIF) equal to 4 x 10(-9) mol l(-1) was reached. (c) 2007 Elsevier B.V. All rights reserved.
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