Analysis of phenolic compounds of willow extracts by HPLC method
DOI:
https://doi.org/10.5281/zenodo.15011204Keywords:
Key words: Salix viminalis L. cormus, high performance liquid chromatography (HPLC), compounds of phenolic natureAbstract
Abstract. In Ukraine, special energy plantations of fast-growing, highly productive willow varieties are being actively established. Most often, domestic and Swedish-selected varieties and hybrids of rod-shaped willow are used. An analysis of available scientific sources reveals that data on the pharmacognostic studies of 'energy willow' raw materials remain significantly limited. The aim of our work is to analyze the composition of phenolic compounds of willow extracts obtained from raw materials collected on an energy plantation. Materials and methods. Willow shoots were harvested from an energy plantation in the Rivne region. The samples were analyzed by HPLC using a Shimadzu HPLC system under the following conditions: a Phenomenex Luna C18(2) column (250 × 4.6 mm, particle size – 5 μm); column temperature – 35 °C; detection wavelengths – 330 nm (for hydroxycinnamic acids and flavonoid glycosides), 370 nm (for flavonoid aglycones), 280 nm (for tannins), and 340 nm (for coumarins); mobile phase flow rate – 1 ml/min; injection volume – 5 μl. The mobile phase consisted of eluent A (0.1% trifluoroacetic acid solution in water) and eluent B (0.1% trifluoroacetic acid solution in acetonitrile) in various ratios. Component identification was performed based on retention times and the compliance of UV spectra with reference substances. Results. The chemical composition of willow bark extracts (50%, 70%, 96% ethanol and 80% methanol) was investigated by HPLC, and 12 phenolic compounds were identified and quantified: flavonoids catechin, apigenin-7-glucoside, quercetin, rutin, hyperoside, quercitrin, phenolic acids chlorogenic, neochlorogenic and caffeic acids, gallic and ellagic acids, coumarin scopoletin. The raw material of "energy willow" is a promising plant raw material as a source of bioactive compounds for pharmaceutical purposes and requires further research.
Key words: Salix viminalis L. cormus, high performance liquid chromatography (HPLC), compounds of phenolic nature
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