Hydrosols of Veronica species with antioxidant activity

Composition of volatile compounds and antioxidant activity of hydrosols of five Veronica species is presented in this research: V. acinifolia, V. anagallis-aquatica, V. anagalloides, V. catenata and V. arvensis. Hydrodistillation (HD) and microwave-assisted extraction (MAE) were methods used for the extraction of free volatile compounds (FVCs) in hydrosols of the chosen species. These extraction methods yielded two layers, the lipophilic layer or essential oil and the aqueous layer – hydrosols. In general, research on the aroma profiles of hydrosols and their biological efficacy is limited but in the last decade, hydrosols have been increasingly explored due to higher acceptance towards using natural products in daily life.

The compounds β – ionone and benzene acetaldehyde were detected in all five species regardless of the extraction method. Except these two compounds, (E)-β-damascenone was detected in all HD hydrosols and caryophyllene oxide in all MAE hydrosols. Hydrosols from both extraction techniques, were tested by two methods: ORAC and DPPH. Comparing the antioxidant activity of all hydrosols, it can be concluded that V. anagallis-aquatica HD hydrosol and V. anagalloides HD hydrosol showed highest but similar antioxidant activity in ORAC method. For DPPH method, V. arvensis HD hydrosol showed highest antioxidant activity. Both V. anagalloides HD and V. anagallis-aquatica HD hydrosols had benzene acetaldehyde in high percentages. Veronica arvensis HD extract also had benzene acetaldehyde together with (E)-β-damascenone as a major compound so these compounds could be responsible for the shown antioxidant activity of these extracts.

 

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Artikel online veröffentlicht:
16. November 2023