Free and bound phenolic acids in inflorescences and rhizomes with roots of Hieracium pilosella L. (Asteraceae)

The analysis of the fractions of free and bound, liberated by hydrolysis, phenolic acids in the inflorescences and rhizomes with roots of Hieracium pilosella L. was conducted by 2D-TLC and RP-HPLC methods. In the inflorescences fourteen phenolic acids were found: chlorogenic, gallic, protocatechuic, homoprotocatechuic, caffeic, gentisic, p-hydroxyphenylacetic, p-hydroxybenzoic, m-hydroxybenzoic, p-coumaric, syringic, vanillic, ferulic and salicylic. In the rhizomes with roots nine phenolic acids were identified: chlorogenic, gallic, homoprotocatechuic, caffeic, gentisic, p- hydroxyphenylacetic, p-hydroxybenzoic, syringic and vanillic. By means of the RP-HPLC method the contents of major acids were estimated which ranged from 0.01 mg% up to 139.50 mg%. Caffeic acid is the remarkably dominating constituent of both plant materials. Phenolic compounds may contribute to invasiveness and medicinal properties of this species

The phenolic acids of some species of the Oenothera L. genus

The occurence and approximative quantitative proportions of the phenolic acids in four species of the Oenothera L. genus was determined by the method of TLC and HPLC. In all species of Oenothera L. genus the permanent occurrence of acids: 2-hydroxy-4-metoxybenzoic, salicylic, ferulic, syringic, vanillic, p-coumaric, p-hydroxybenzoic, p-hydroxyphenylacetic, γ-rezorcil, gentysic, protocatechuic, caffeic and gallic has been confirmed. Whereas the other phenolic acids: o-coumaric, o-hydroxyphenylacetic and pirocatechuic were found in some species of the Oenothera L. genus only

Flavonoids from <i>Jovibarba globifera</i> (Crassulaceae) rosette leaves and their antioxidant activity

<div><p>Seven flavonoids new for the genus <i>Jovibarba</i>, kaempferol <b>1</b>, kaempferol 3-<i>O</i>-galactopyranosyl-(1 → 2)-<i>O</i>-α-l-rhamnopyranoside <b>2</b>, kaempferol 3-<i>O</i>-β-d-glucoside <b>3</b>, kaempferol 3-<i>O</i>-α-l-rhamnopyranosyl-7-<i>O</i>-α-d-glucofuranosyl-(1 → 2)-<i>O</i>-α-l-rhamnopyranoside <b>4</b>, kaempferol 3-<i>O</i>-β-d-glucopyranoside-7-<i>O</i>-α-l-rhamnopyranoside <b>5</b>, kaempferol 3,7,4′-<i>O</i>-trimethyl ether <b>6</b> and quercetin <b>7</b>, were isolated from fresh and dried leaves of <i>J.</i><i>ovibarba</i><i> globifera</i> subsp. <i>globifera</i>. The structures of these compounds were established by analysis of their spectroscopic (¹H and ¹³C NMR) and spectrometric (MS) data, as well as by comparison of these with those reported in the literature. All of the flavonoids are reported for the first time from the investigated taxon. In addition the antioxidant activities in DPPH test of selected compounds were evaluated.</p></div