1. Innovative approaches to extracting phenolics from Echinacea purpurea : maximizing yield and efficacyMateja Šenica, Gregor Mlinšek, Denis Rusjan, Maja Mikulič Petkovšek, 2025, original scientific article Abstract: People have long been interested in plants rich in secondary metabolites and have tried to isolate them outside the plants. Purple coneflower is a crucial medicinal plant, known for its broad spectrum of bioactive substances. The type of solvent and the duration of maceration had an important impact on the phenolic level of purple coneflower leaves, flowers and roots. The flowers and leaves had a significantly higher phenolic concentration than the roots. The results of this study show the importance of stabilizing and regulating the polarity of the solvent and the duration of maceration to obtain the highest yield of phenolics from purple coneflower. The greatest yield of phenolics was gained with two natural extraction solvents, 5% acetic acid and glycerol, after 3 days of maceration, yielding (1696.05 mg 100 g$^{−1}$ DW) and (2796.94 mg 100 g$^{−1}$ DW) from the flowers of purple coneflower, respectively. For purple coneflower leaves and roots, the best extraction method was 40% ethanol after 3 days of maceration, and the total content analyzed was 1022.43 mg 100 g$^{−1}$ DW and 1011.32 mg 100 g$^{−1}$ DW, respectively. Different phenolics respond significantly to different maceration factors, but the best product from the flowers of purple coneflower is glycerol extract after 9 days of maceration. From the leaves of purple coneflower, we obtained the highest phenolic yield when producing extract in glycerol, a 40% ethanol tincture, or an acetic acid product after 3 days of maceration.
Keywords: purple coneflower, phenolic compounds, extraction efficiency, solvents, functional ingredients
Published in DiRROS: 13.04.2026; Views: 243; Downloads: 146
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2. Comprehensive assessment of harvesting method effects on FAEE, waxes, fatty acids, phenolics, volatiles, and sensory characteristics of Buža virgin olive oilKarolina Brkić Bubola, Marina Lukić, Iva Pastor, Igor Lukič, Gašper Kozlovič, Milena Bučar-Miklavčič, Olivera Koprivnjak, Marin Krapac, 2026, original scientific article Abstract: Increasing competition in the olive oil market and labor shortages have accelerated the use of mechanical harvesting, raising concerns about potential fruit damage and its impact on oil quality. This study examined how three harvesting methods: manual using hand-held combs (B-HH) and two mechanical, hand-held shaker rake (B-MH-1) and self-propelled trunk shaker (B-MH-2), affect the quality and composition of Buža variety virgin olive oil. The greatest damage to the fruits occurred in B-MH-1, whereas the least was observed in B-HH. Olives were processed within 24 h, and oils were analyzed for basic quality parameters, fatty acid ethyl esters (FAEE), waxes content, fatty acid composition, volatile and phenolic profiles, and sensory attributes. Harvesting method did not significantly affect acidity, peroxide value, UV indices, FAEE, waxes, and fatty acids. Analyses of volatile and phenolic compounds revealed only slight differences. Nevertheless, sensory assessment detected no defects, with only minor reductions in positive odor attributes in B-MH-1. Taste attributes remained unchanged, consistent with similar total phenolic content. Overall, when olives are promptly processed, all investigated harvesting methods result in high-quality Buža olive oil.
Keywords: olive fruits, harvesting method, olive oil, quality, fatty acids, FAEE, waxes, volatile compounds, phenolic compounds, sensory characteristics
Published in DiRROS: 07.01.2026; Views: 538; Downloads: 279
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3. Grain characteristics of eleven buckwheat varieties (Fagopyrum spp.) grown under Central European climatic conditionsLovro Sinkovič, Vladimir Meglič, Barbara Pipan, 2024, original scientific article Keywords: buckwheat variety, inductively coupled plasma mass spectrometry, ICP-MS, elemental profile, grain size, total phenolic compounds
Published in DiRROS: 29.10.2024; Views: 1585; Downloads: 469
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4. Sodium-polyacrylate-based electrochemical sensors for highly sensitive detection of gaseous phenol at room temperatureTea Romih, Eva Menart, Vasko Jovanovski, Andrej Jerič, Samo Andrenšek, Samo B. Hočevar, 2020, original scientific article Keywords: electrochemical gas sensor, phenol, phenolic compounds, ambient conditions, cultural heritage preservation, occupational health and safety
Published in DiRROS: 22.07.2020; Views: 3698; Downloads: 2257
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