Extraction of aromatic volatiles by hydrodistillation and supercritical fluid extraction with CO 2 from Helichrysum italicum subsp. picardii growing in Portugal

Utilization of the integrated process of supercritical extraction and impregnation for incorporation of Helichrysum italicum extract into corn starch xerogel

“…Kladar et al [43] determined the total flavonoid content in H. italicum ethanolic extract, being 20.68±0.66 mg QE/g dry extract, expressed as quercetin equivalents, while in this study we obtained 130.27±1.14 and 57.77±1.01 mg CE/g dry extract, expressed as catechin equivalents, for the extract obtained with pure scCO 2 and extract obtained using co-solvent, respectively. Results presented in Tables 2 and 3 Table 3 indicated moderate antioxidant potential of H. italicum extracts, which is in accordance with previously reported data [15,16]. Costa et al [15] showed that the DPPH radical scavenging ability of the scCO 2 extracts of H. italicum isolated at 120 bar and 40 °C increased in a dose-dependent manner (approximately 15-60% at concentration of 0.625-5.0 mg/mL), while the extracts isolated at 90 bar and 40 °C were not able to reduce the DPPH radical at the studied concentrations.…”

“…Results presented in Tables 2 and 3 Table 3 indicated moderate antioxidant potential of H. italicum extracts, which is in accordance with previously reported data [15,16]. Costa et al [15] showed that the DPPH radical scavenging ability of the scCO 2 extracts of H. italicum isolated at 120 bar and 40 °C increased in a dose-dependent manner (approximately 15-60% at concentration of 0.625-5.0 mg/mL), while the extracts isolated at 90 bar and 40 °C were not able to reduce the DPPH radical at the studied concentrations. On the other side, Poli et al [16] (1.5 times higher content than in the extract obtained with pure CO 2 ), whereas the extract obtained with pure scCO 2 contained 50.3% fatty acids, esters, aldehydes and alcohols and 2 times higher total phenolic content than the extract obtained with addition of ethanol, it could be concluded that both types of compounds equally contribute to the antioxidant activity of H. italicum extracts.…”

“…Data on extraction from H. italicum using scCO 2 were reported in few articles found in the literature [11][12][13][14][15][16][17][18]. In these studies, extraction pressure and temperature were varied in the range of 79.3-350 bar and 35.86-64.14 °C respectively, with the extraction times ranging from 1.5 h to 4 h. Obtained yields were in the range of 0.35-6.31%.…”

Chemical composition and antimicrobial and antioxidant activity of Helichrysumitalicum (Roth) G.Don subspecies essential oils

“…Helichrysum picardii, cultivated in Portugal, is dominated by α-pinene (53.5%) and γ-curcumene (27.4%) (Costa et al, 2015).…”

Supercritical Extraction of Scopoletin from Helichrysum italicum (Roth) G. Don Flowers

“…Such properties of the H. italicum derived cosmetic products are most likely due to the presence of significant amounts of polyphenols which are well known antioxidants (Poli et al , ; Tundis et al , ; Rigano et al , ). Some authors have dealt with supercritical fluid extraction (SFE) of H. italicum so far, determining the chemical composition of extracts (Ivanović et al , ; Costa et al , ), but in recent years only Karasartov et al () isolated several coumarins from H. italicum flowers and one of them was identified as scopoletin. Scopoletin, 7‐hydroxy‐6‐methoxycoumarin, has been isolated from many medicinal plants, and is known to be a phytoalexin.…”