Accumulation of polyphenolic acids in the herb of five populations of Hypericum genus
Osinska, E.(Warsaw Agricultural University (Poland). Dept. of Vegetable and Medicinal Plants)E-mail:[email protected]
The aim of this study was to evaluate differences in the accumulation of polyphenolic acids in the herb of three Hypericum species. The research was carried out in 2000 and 2001 on one- and two-year-old plants. The object of the study were 5 populations: two of Hypericum perforatum L., two of Hypericum elegans Steph., and one of Hypericum maculatum Crantz. Three times of harvesting were applied (vegetative stage, beginning of blooming, and full blooming). The raw material of investigated populations of Hypericum genus significantly differed in the total content of polyphenolic acids. In the second year of plant vegetation a higher content of polyphenolic acids (1.3-3.6 percent) in comparison with the first year of vegetation (1.0-2.5 percent) was observed. The composition of polyphenolic acid fractions from two-year-old plants harvested at the beginning of the blooming stage was determined. Among 15 identified polyphenolic acids the main compounds were: p-hydroxybenzoic acid, and p-coumaric acid
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