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

• Autorzy: Franski R. , Bednarek P. , Siatkowska D. , Wojtaszek P. , Stobiecki M.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

monoglycoside; Lupinus luteus; gas chromatography; mass spectrometry; lupin; flavonoids glycoside; desorption ionization

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 1999
• Tom: 46
• Numer: 2
• Opis fizyczny: p.459-473,fig.

Twórcy

autor

Franski R.

• Polish Academy of Sciences, Poznan, Poland

autor

Bednarek P.

autor

Siatkowska D.

autor

Wojtaszek P.

autor

Stobiecki M.

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