Mathematical model for continuous and intermittent microwave-assisted extraction of bioactive compound from plant material: Extraction of β-carotene from carrot peels

Antiplasmodial and antioxidant activities of extracts derived from Trichilia roka (Chiov) (Meliaceae) root bark were determined respectively in vitro and using two methods as well as 1,1-diphenyl-2-picrylhydrazyl radicalscavenging and β-carotene-linoleate model systems. The microwave assisted extraction extract was more effective concern antioxydant activity than the antiplasmodial activity compare to conventional mechanical agitation extraction method. Extracts obtained by microwave assisted extraction showed a high total polyphenol content of 126766 μg Equivalent of Gallic acid /g Dry Mater and a total flavonoid content of 789.22 μg Equivalent of Quercetin/g dry mater but a low antiplasmodial activity with and inhibition concentration of 48.386 μg /mL and 23.983 μg/mL for mechanical agitation extract. The evaluation of the antioxidant properties of the two extracts showed that those obtained by microwave assisted extraction shown in the 1,1-diphenyl-2-picrylhydrazyl assay and in the β-carotene bleaching test, the highest antioxidant activity respectively, with an antioxidant activity of 82.12% and with a radical-scavenging activity with inhibition percentage of 88.78%..

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Optimization of Microwave-Assisted Extraction of Phenolic Compounds from Medicinal and Aromatic Plants: Sideritis raeseri, Sideritis scardica and Origanum vulgare

Current Analytical Chemistry ◽

10.2174/1573411014666180423125631 ◽

2020 ◽

Vol 16 (2) ◽

pp. 106-111

Author(s):

Ioannis Sarakatsianos ◽

Konstantinos Adamopoulos ◽

Victoria Samanidou ◽

Athanasia Goula ◽

Elissavet Ninou

Keyword(s):

Microwave Radiation ◽

Plant Material ◽

Extraction Yield ◽

Microwave Assisted Extraction ◽

Aromatic Plants ◽

Origanum Vulgare ◽

Medicinal And Aromatic Plants ◽

Microwave Assisted ◽

Assisted Extraction ◽

Phenolic Constituents

Background: Medicinal plants consist a rich source of natural pharmacologically active compounds. The aim of the current work, was the study and optimization of the extraction conditions of phenolic constituents from important medicinal and aromatic plants, id. Sideritis raeseri, Sideritis scardica and Origanum vulgare, implementing microwave assisted extraction technique. Methods: Optimization was based on various parameters affecting extraction procedure, such as the duration of microwave radiation, the ratio of plant material mass to the solvent, the type and the concentration of the solvent. Results: The results revealed that 10 min of microwave radiation provided the maximum extraction yield of the phenolic constituents. The ratio of the plant material mass and the solvent had minor effect to the extraction efficiency. Conclusion: The examined solvents provided an extraction yield of phenolic constituents following the order: EtOH<MeOH<H2O<MeOH:H2O (80:20, v/v)<EtOH:H2O (60:40, v/v), in the case of Sideritis raeseri and Sideritis scardica and the order: H2O<MeOH:H2O (80:20, v/v)<EtOH:H2O (60:40, v/v) < MeOH<EtOH in the case of Origanum vulgare.

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