engleski

Analysis of polyphenols, phytosterols, and bitter principles in Teucrium L. species

Total polyphenols, tannins, ß-sitosterol, and bitterness values were determined in native and cultivated populations of Teucrium L. species from Croatia (T. arduini L., T. botrys L., T. chamaedrys L., T. flavum L., T. montanum L., T. polium L., and T. scordium L. subsp. scordioides Schreb.). Teucrium species have long been present in folk medicine for diverse medicinal uses, but little is known about polyphenols, phytosterols, and bitter principles. Spectrophotometrically determined contents of total polyphenols (TP) and tannins (T) significantly varied among investigated Teucrium species and were somewhat higher in native populations. The highest TP and T contents were measured in native specimen of T. montanum (TP: 13.68% ; T: 3.48%). Scanning densitometry was used for measurements of ß- sitosterol levels in plant samples ranged from 0.056% (T. montanum) to 0.129% (T. botrys), and it was not significantly different between native and cultivated specimens of the same plant species. Bitterness values were similar for native and cultivated samples of the same plant species ; the highest was measured for T. montanum (15659). The present study suggests that Teucrium species growing in Croatia have a significant potential for cultivation and might be a valuable source of natural bioactive compounds.

Teucrium; total polyphenols; tannins; ß-sitosterol; bitterness value; multivariate analysis

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