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Methodological aspects of biologically active compounds quantification in the genus Hypericum.

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Secondary metabolite accumulation in Hypericum species differs between leaves and stems, with extraction solvent choice impacting yields. Capillary electrophoresis offers a viable alternative to HPLC for metabolite quantification.

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Area of Science:

  • Phytochemistry
  • Analytical Chemistry
  • Pharmacognosy

Background:

  • Hypericum species are known for their diverse secondary metabolites with potential medicinal properties.
  • Understanding metabolite distribution and extraction efficiency is crucial for their effective utilization.
  • Standard analytical techniques like HPLC are commonly used for metabolite quantification.

Purpose of the Study:

  • To compare the accumulation of secondary metabolites in the vegetative parts (stems and leaves) of Hypericum perforatum and Hypericum annulatum.
  • To evaluate the influence of different extraction solvents (methanol and ethanol) on metabolite yields.
  • To assess the suitability of capillary electrophoresis (CE) as an alternative to HPLC for quantifying metabolites in Hypericum perforatum.

Main Methods:

  • Comparative analysis of secondary metabolite content in stems and leaves of H. perforatum and H. annulatum.
  • Extraction using 80% aqueous methanol and 60% aqueous ethanol.
  • Quantification of metabolites including rutin, hyperoside, quercetin, hypericin, epicatechin, and hyperforin.
  • Method validation comparing capillary electrophoresis (CE) with High-Performance Liquid Chromatography (HPLC).

Main Results:

  • Leaves generally showed higher accumulation of most metabolites (rutin, hyperoside, quercetin, hypericin) than stems, with exceptions for epicatechin and hyperforin in H. annulatum.
  • Extraction solvent preference varied by metabolite and species; ethanol favored hypericin, quercetin, quercitrin, and hyperoside, while methanol favored epicatechin, rutin, and hyperforin.
  • Total soluble phenol content was not significantly affected by the extraction solvent.
  • CE demonstrated comparable results to HPLC for metabolite quantification in H. perforatum, with differences not exceeding 10%.

Conclusions:

  • Metabolite distribution in Hypericum species is organ-specific, with leaves being richer in several key compounds.
  • Optimizing extraction solvent based on target metabolites and species can significantly improve yields.
  • Capillary electrophoresis presents a reliable and potentially more efficient alternative for the quantitative analysis of Hypericum metabolites.