Screening of alkaloidal plants for antioxidant and anticholinesterase activity in vitro II.

Pšeničková, Jana. Screening of alkaloidal plants for antioxidant and anticholinesterase activity in vitro II. Charles University in Prague, Faculty of Pharmacy in Hradec Králové, Department of Pharmaceutical Botany and Ecology. 57 pp. Supervisor: Ing. Kateřina Macáková, Ph.D. Keywords: cholinesterase inhibition activity, antioxidant activity, alkaloids, Alzheimer's disease, oxidative stress Selected plant species of the families Papaveraceae, Fumariaceae and Ranunculaceae were tested in terms of this thesis. Alkaloid content was evaluated by a thin-layer chromatography (TLC); ethanol and alkaloid extracts were tested for their cholinesterase inhibitory activity and antioxidant activity. All of the studied species were tested for the cholinesterase inhibition activity by the Ellman's spectrophotometric method using the 5,5'-dithiobis-2-nitrobenzoic acid. The activity of extracts was compared with IC50 values of common inhibitors of cholinesterases: galanthamine (IC50 HuAChE = 2.59 ± 0.065 μg/ml, HuBuChE = 58.02 ± 1,30 μg/ml), and huperzine A (IC50 HuAChE = 0.061 ± 0.001 μg/ml, HuBuChE 1000 μg/ml). The highest cholinesterase inhibitory activity from the tested specimen showed ethanol extract from the aerial part of Glaucium corniculatum (IC50 AChE = 0,39 µg/ml, IC50 BuChE = 4,27 µg/ml). The species..