Polyphenol extraction from <i>Origanum dictamnus</i> using low-transition temperature mixtures composed of glycerol and organic salts: Effect of organic anion carbon chain length

Slim, Zaher; Jancheva, Magdalena; Grigorakis, Spyros; Makris, Dimitris P.

doi:10.1080/00986445.2018.1458026

Cited by 15 publications

(15 citation statements)

References 35 publications

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“…Therefore, these DES would require less amount of water for polarity regulation. This theory is consistent with recent findings, which demonstrated that the higher the lipophilicity of the HBA, the higher the amount of water required for maximum polyphenol recovery [27]. Contour plots illustrating the effect of variable covariation on the response (Y TP ).…”

Section: Termsupporting

confidence: 91%

Green Valorization of Olive Leaves to Produce Polyphenol-Enriched Extracts Using an Environmentally Benign Deep Eutectic Solvent

et al. 2020

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Olive leaves (OLL) are considered to be a highly appreciated bioresource of bioactive polyphenolic phytochemicals, embracing several different structures. However, extraction processes based on deep eutectic solvents (DES) are very limited despite the wide range of techniques developed for the efficient recovery of polyphenols. This study had as objective the development of a simple, green, high-performance extraction methodology for OLL polyphenols, using a recently reported effective DES, composed of L-lactic acid and glycine. Initially, a screening was performed to select the most appropriate L-lactic/glycine molar ratio and process optimization was then carried out with response surface methodology. The optimized process variable values were DES/water (78% w/v), liquid-to-solid ratio of 36 mL g−1, and stirring speed of 500 rounds per minute, and the total polyphenol yield amounted to 97.53 ± 3.54 mg gallic acid equivalents per g dry matter. Extraction with DES at 80 °C did not significantly increase the total polyphenol yield, but it did enhance the total flavonoid yield and antioxidant activity. High-performance liquid chromatography analyses revealed that extraction with the DES resulted in extended oleuropein hydrolysis, to the favor of hydroxytyrosol formation. This finding might have a prospect in using properly tuned DES for polyphenol modification with improved bioactivities.

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Section: Termsupporting

confidence: 91%

Green Valorization of Olive Leaves to Produce Polyphenol-Enriched Extracts Using an Environmentally Benign Deep Eutectic Solvent

et al. 2020

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“…Such a phenomenon has recently been well documented, by correlating R L/S with diffusivity [32]. Previously published examinations showed that optimal R L/S levels for polyphenol extraction with DES may vary within 29-50 mL g −1 [33][34][35]. The optimal value reported in this study (59 mL g −1 ) is of similar magnitude.…”

Section: Ultrasound-assisted Pretreatment: Effect On Extraction Kineticssupporting

confidence: 77%

“…It is to be noted that for any temperature tested, ultrasound-pretreated samples exhibited higher k, evidence that ultrasonication pretreatment may favour higher extraction rates. This argument was The decline in the extraction rate, k, as temperature increased was a rather paradox phenomenon, since a number of earlier studies demonstrated that polyphenol extraction obeyed the Arrhenius model [35,42,43]. However, a recent examination showed that polyphenol extraction with certain glycerol-based DES may display anti-Arrhenius behaviour [33].…”

Section: (6)mentioning

confidence: 99%

Polyphenol Extraction from Humulus lupulus (Hop) Using a Neoteric Glycerol/L-Alanine Deep Eutectic Solvent: Optimisation, Kinetics and the Effect of Ultrasound-Assisted Pretreatment

et al. 2019

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The investigation presented herein had as its scope the development of an integrated process for the efficient extraction of polyphenols from hop. For this purpose, a novel, natural deep eutectic solvent (DES) was synthesised, composed of glycerol and L-alanine, and the process was optimised by deploying a response surface methodology based on a Box-Behnken design. The variables considered were the DES/water proportion, the liquid-to-solid ratio and the stirring speed. Under the optimised conditions, the yield in total polyphenols achieved was 118.97 ± 8.27 mg gallic acid equivalents per g of dry mass. Ultrasonication, incorporated into the process as a pretreatment step, was shown to significantly change the kinetic pattern of polyphenol extraction and contributed to attaining higher yields only at 80 • C, whereas at lower temperatures a supressing effect was observed. Furthermore, increasing temperature was negatively correlated with the second-order extraction rates, evidencing a slow-down of the extraction rate at elevated temperatures.

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“…O. dictamus collected in Greece showed a simpler polyphenol profile, [425] with vicenin-2 (34), apigenin 7-O-glucuronide (35), luteolin (5), chlorogenic (36) and rosmarinic acids (4) among the main components.…”

Section: Oreganomentioning

confidence: 99%

New Tricks for Old Guys: Recent Developments in the Chemistry, Biochemistry, Applications and Exploitation of Selected Species from the Lamiaceae Family

Napoli

Siracusa

Ruberto

2020

Chemistry & Biodiversity

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Lamiaceae is one of the largest families of flowering plants comprising about 250 genera and over 7,000 species. Most of the plants of this family are aromatic and therefore important source of essential oils. Lamiaceae are widely used as culinary herbs and reported as medicinal plants in several folk traditions. In the Mediterranean area oregano, sage, rosemary, thyme and lavender stand out for geographical diffusion and variety of uses. The aim of this review is to provide recent data dealing with the phytochemical and pharmacological studies, and the more recent applications of the essential oils and the non‐volatile phytocomplexes. This literature survey suggests how the deeper understanding of biomolecular processes in the health and food sectors as per as pest control bioremediation of cultural heritage, or interaction with human microbiome, fields, leads to the rediscovery and new potential applications of well‐known plants.

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Polyphenol extraction from Origanum dictamnus using low-transition temperature mixtures composed of glycerol and organic salts: Effect of organic anion carbon chain length

Cited by 15 publications

References 35 publications

Green Valorization of Olive Leaves to Produce Polyphenol-Enriched Extracts Using an Environmentally Benign Deep Eutectic Solvent

Green Valorization of Olive Leaves to Produce Polyphenol-Enriched Extracts Using an Environmentally Benign Deep Eutectic Solvent

Polyphenol Extraction from Humulus lupulus (Hop) Using a Neoteric Glycerol/L-Alanine Deep Eutectic Solvent: Optimisation, Kinetics and the Effect of Ultrasound-Assisted Pretreatment

New Tricks for Old Guys: Recent Developments in the Chemistry, Biochemistry, Applications and Exploitation of Selected Species from the Lamiaceae Family

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