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The determination of the content of the polyphenols in the areal parts of the species Centaurea rupestris L. and C. fritschii Hayek (Asteraceae)

Centaurea rupestris L. (Asteraceae), C. fritschii Hayek (Asteraceae), polyphenols The content of flavonoids, total polyphenols and tannins in the areal parts of the endemic plant species Centaurea rupestris L. and C. fritschii Hayek are determined. These compounds were investigated during the three vegetation seasons. Flavonoids are present in the most quantity in the leaves of C. fritschii, where they make on an average 0.90-1.35% and in flowers of C. rupestris which contain on an average 0.73-0.95% flavonoids. In the other investigated samples this content is somewhat lower. The content of the total polyphenols is the highest in the leaves of investigated plants. They make on an average 5.90-7.80% of C. rupestris and 7.60-11.20% of C. fritschii leaves. The richest in tannins are the leaves of C. fritschii, where they make on an average 1.60-3.80%. In C. rupestris tannins are present in the greatest amount in the stems, where they do on an average 0.80-2.30%. It is visible from quoted results thet the areal parts of C. fritschii are markedly richer in the polyphenols in relation to C. rupestris.

Centaurea rupestris L. (Asteraceae); C. fritschii Hayek (Asteraceae); polyphenols

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