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The modulatory effect of flavonoid glycosides on angiotensin II stimulated PC 12 cells

100%

Zielinski B. , Berdowska I. , Seweryn E. , Ceremuga I. , Chwilkowska A. , Fecka I. , Banas T.

Cellular and Molecular Biology Letters

2002

tom 07

nr Suppl.

Application of mass spectrometry to structural identification of flavonoid monoglycosides isolated from shoot of lupin [Lupinus luteus L.]

75%

Franski R. , Bednarek P. , Siatkowska D. , Wojtaszek P. , Stobiecki M.

tom 46

nr 2

Flavonoid glycosides constitute important group of plant secondary metabolites. This class of natural products play significant role in different physiological processes. A new methodological approach where mass spectrometric techniques are applied to structural studies of this class of compounds is presented. Four flavonoid O-monoglycosides and one C-monoglycoside were isolated from green parts of lupin (Lupinus luteus L.). Several different mass spectrometric techniques were applied to structural elucidation of isolated compounds. Desorption ionization mass spectrometry was used for registration of mass spectra of intact and derivatized (permethylated) flavonoid glycosides. In some cases electron impact mass spectra of permethylated compounds were also recorded. Methylated samples after methanolysis and further derivatization of free hydroxyl groups (methylation or acetylation) were analyzed with gas chromatography-mass spectrometry. Combined information drawn from the registered mass spectra enabled us to define molecular mass, structure of aglycones and sugars, and positions of glycosidic bonds on the aglycon. Structures of four flavonoid monoglycosides were elucidated as follows: genistein 7-O-glucoside (1), genistein 4'-O-glucoside (2), 2'-hydroxygenistein 7-O-glucoside (3), and apigenin or genistein 8-C-glycoside (5). For the fourth O-glycoside (4) only molecular mass and masses of the aglycone and sugar were estimated.

Dihydroflavonol glycoside from Citrus sinensis roots

63%

Intekhab J. , Aslam M.

2009

tom 55

nr 4

38-43

The roots of Citrus sinensis have yielded a flavanoid glycoside. The compound was characterized as dihydrokaempferol 7,4’-dimethyl ether-3-O-α-rhamnopyranosyl(1”’→ 6”)-β-glucopyranoside on the basis of U.V, I.R and N.M.R (1H, 13C).

W korzeniach Citrus sinensis znaleziono glikozyd flawonoidowy. Na podstawie badań UV, IR i NMR (1H, 13C) składnik ten zidentyfikowano jako dihydrokamferol 7, 4’-dimetyl eter-3-O-α-ramnopyranozyl (1”’→ 6”)-β-glukopyranozyd.

Flavonoid glycosides in nine Polygonum L. taxons

63%

Smolarz H. D.

2002

tom 71

nr 1

The inhibitory effect of polyphenols on human gut microbiota

51%

Duda-Chodak A.

2012

tom 63

nr 5