Distribution of 8-hydroxyflavone glycosides and flavonoid aglycones in some Spanish Sideritis species
1993
Tomas-Barberan, F.A. | Gil, M.I. | Ferreres, F. | Rivera, D. | Obon, C. | Tomas-Lorente, F.
The occurrence of the anti-inflammatory flavonoids hypolaetin 8-glucoside, cirsiliol and siderito-flavone, and other flavonoids has been investigated in taxonomically related taxa of the genus Sideritis by HPLC. All the analysed taxa showed very similar flavonoid aglycone patterns, while they had clear differences in the flavonoid glycoside patterns. The analyses of flavonoid glycosides allowed the differentiation of five different groups of Sideritis taxa. There is a correlation between the chemical groups and the geographical location of the analysed taxa. In S. mugronensis, S. tragoriganum and S. reverchonii, the flavonoids hypolaetin 8-glucuronide, hypolaetin 4'-methyl ether 8-glucoside and 8-glucuronide have also been identified, this being the first time that these substances are reported in the Labiatae.
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