Extraction of Polyphenols From Aromatic and Medicinal Plants: An Overview of the Methods and the Effect of Extraction Parameters

Oreopoulou, Antigoni; Tsimogiannis, Dimitrios; Oreopoulou, Vassiliki

doi:10.1016/b978-0-12-813768-0.00025-6

Cited by 123 publications

(116 citation statements)

References 106 publications

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“…Even if the yield with SFE was lower than the yield obtained with other solvents, the use of this technique allows to obtain of a solvent-free extract, since CO 2 is used as a supercritical fluid [9,49]. CO 2 is a gas at room temperature, so once the extraction is completed and the system decompressed, a substantial elimination of CO 2 is achieved without residues, yielding a solvent-free extract [33,50].…”

Section: Total Phenolic Contentmentioning

confidence: 99%

Species-Specific Antioxidant Power and Bioactive Properties of the Extracts Obtained from Wild Mediterranean Calendula Spp. (Asteraceae)

et al. 2019

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In this study we focused on four taxa of the genus Calendula (C. maritima, C. suffruticosa subsp. fulgida, C. arvensis, and the hybrid between the first two ones), collected in Mediterranean area (Sicily). Six extracts for each species were obtained using solvents with increasing polarity (hexane, ethanol 80%, acetone 70%, and water) and through extraction by supercritical fluids (SFE). It has been observed that the solvent with the highest extraction efficiency was ethanol 80% for all species. However, SFE extracts showed high antioxidant activity comparable to the ethanol 80% extract (polyphenol, DPPH, and reducing power method). These findings were confirmed by in vitro analysis (MTT assay) where it was observed that the tested concentration (24 µg/mL), obtained from ethanol 80% and SFE extracts, showed a protective effect comparable to that induced by a synthetic antioxidant. Extraction with SFE ensured a great selectivity by avoiding the use of toxic organic solvents and thus consisted of a promising technique for sustainable production of Calendula extracts.

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Section: Total Phenolic Contentmentioning

confidence: 99%

Species-Specific Antioxidant Power and Bioactive Properties of the Extracts Obtained from Wild Mediterranean Calendula Spp. (Asteraceae)

et al. 2019

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“…Studies of this plant are not extensive, however its use as a contraceptive is suggested [39]. In similar species such as M. púdica antiparasitic activity is described [40,41], as a larvicide [42] and its use in electrochemical detection of AgNPs [40]. Also noted the antibacterial and antifungal action of M. tenuiflora [43].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Silver Nanoparticles Using Aqueous Leaf Extract of Mimosa albida (Mimosoideae): Characterization and Antioxidant Activity

et al. 2020

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The search for sensitive and rapid analytical techniques for the determination of natural antioxidants is an area in constant growth due, among other aspects, to the complexity of plant matrices. In this study, silver nanoparticles prepared with the aqueous extract of Mimosa albida leaves were used to assess their polyphenolic content and antioxidant capacity. Silver nanoparticles were characterized by different techniques. As a result, nanoparticles of 6.5 ± 3.1 nm were obtained. The total phenolic content in the extract was 1320.4 ± 17.6 mg of gallic acid equivalents GAE· 100 g−1 and in the nanoparticles 257.3 ± 5.1 mg GAE· 100 g−1. From the phenolic profile analyzed by ultra high-performance liquid chromatography (UPLC) with a diode-array detector (DAD), the presence of apigenin and luteolin in the plant extract is postulated. The antioxidant capacity measured by oxygen radical absorbance capacity ORAC-fluorescein assay was 86917 ± 6287 and 7563 ± 967 µmol ET g−1 in the extract and nanoparticles respectively. Electrochemical analysis by cyclic voltammetry (CV) confirmed the effective reduction capacity of the Mimosa albida leaves extract to reduce Ag ions to AgNPs and differential pulse voltammetry (DPV) suggested the presence of two main reducing agents in the extract. From this study, it was concluded that the aqueous extract of Mimosa albida contains reducing agents capable of synthesizing silver nanoparticles, which can be used in the phytochemical industry.

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“…According to Oreopoulou, Tsimogiannis, and Oreopoulou (2019), the efficiency of a solvent depends mainly on its ability to dissolve these compounds. For example, ethanol is a suitable solvent to dissolve flavonoid glucosides, while water is able to dissolve phenolic acid glycosides.…”

Section: Resultsmentioning

confidence: 99%

Siriguela peels provide antioxidant compounds‐rich extract by solid–liquid extraction

Ribeiro

Thomaz

Brito

et al. 2020

J Food Process Preserv

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This work aimed to extract antioxidant compounds from siriguela peels. For that, operational conditions of ethanol percentage and solid/liquid ratio (w/v) were defined based on a rotational central composite design. The extracts were evaluated for the determination of total phenolic compounds (TPC) and antioxidant capacity by ABTS•+, DPPH•, and FRAP methods, and under best operational condition, UPLC‐qTOF/MS analysis was also performed. The best operational condition for antioxidant compounds recovery was that using 30% ethanol and solid/liquid ratio of 1:33. Under this condition, TPC, ABTS•+, DPPH•, and FRAP values were 1611 mg GAE 100 g−1, 103 µmol TE g−1, 102 µmol TE g−1, and 534 µmol Fe2+ g−1, respectively. The extract was major composed of quercetin derivatives. Therefore, siriguela peels are a potential source of antioxidant compounds, which expands the use of this residue by the food industry and can also mitigates environmental impact caused by its inappropriate disposal. Practical applications Findings of the present work show that siriguela peels are a source of antioxidant compounds. After the evaluation of the extraction process, an extract major composed of quercetin derivatives was obtained. This extract could be used in future applications for the development of natural preservatives as well as functional food products. Also, the extraction method evaluated in this work presents low cost, which becomes this approach a potential alternative to add value to agro‐chain of other species of the genus Spondias.

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Extraction of Polyphenols From Aromatic and Medicinal Plants: An Overview of the Methods and the Effect of Extraction Parameters

Cited by 123 publications

References 106 publications

Species-Specific Antioxidant Power and Bioactive Properties of the Extracts Obtained from Wild Mediterranean Calendula Spp. (Asteraceae)

Species-Specific Antioxidant Power and Bioactive Properties of the Extracts Obtained from Wild Mediterranean Calendula Spp. (Asteraceae)

Synthesis of Silver Nanoparticles Using Aqueous Leaf Extract of Mimosa albida (Mimosoideae): Characterization and Antioxidant Activity

Siriguela peels provide antioxidant compounds‐rich extract by solid–liquid extraction

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