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Polyphenolic Constituents and Antioxidant Potential of Geranium stepporum Davis

Didem Şöhretoğlu, Mahmut Koray Sakar, Suna Atasayar Sabuncuoğlu, Hilal Özgüneş and Olov Sterner

Hacettepe University, Faculty of Pharmacy, Department of Pharmacognosy, TR-06100 Ankara, Türkiye

Hacettepe University, Faculty of Pharmacy, Department of Toxicology, TR-06100 Ankara, Türkiye

Division of Organic Chemistry, Department of Chemistry, Lund University, P.O. Box 124, 22100 Lund, Sweden

Abstract: The crude MeOH extract prepared from the aerial parts of G. stepporum and its EtOAc, n-BuOH, H 2O subextracts were screened for their inhibitory activity on H 2O 2-induced lipid peroxidation in human red blood cells. The EtOAc subextract was found to be the most active one and its chemical composition was further analysed. Six polyphenolic secondary metabolites including quercetin (1) , rutin (2) , methyl gallate (3) , pusilagin (4) , 1,3,6-tri- O -galloyl- β -glucospyranose (5) and 1,2,3,4,6-penta- O -galloyl- β -glucopyranose (6) were isolated from the EtOAc extract by successive chromatographic methods ( Sephadex CC, silica gel CC and P-TLC). The structures of the isolates were elucidated by 1D- and 2D-NMR and MS. This is the first report of occurrence of hydrolysable tannins in G. stepporum .

Keywords: Geranium stepporum ; Geraniaceae; galloylglucopyranose; hydrolysable tannin; flavonoid; antioxidant effect.