scholarly journals Antioxidant Properties of Grapevine Leaves Obtained by Optimized Microwave Assisted Extraction

2021 ◽  
Vol 1 (36) ◽  
pp. 1-12
Author(s):  
Elif Meltem İşçimen
Keyword(s):  
Antioxidant Properties ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Grapevine Leaves

scholarly journals Sustainable Biosynthesis of Antioxidants from Koji Rice Fermented with Aspergillus flavus Using Microwave-Assisted Extraction

2021 ◽  
Vol 11 (1) ◽  
pp. 430
Author(s):  
Hassan Hadi Mehdi Al Rubaiy ◽  
Ammar Altemimi ◽  
Ali Khudair Jaber Al Rikabi ◽  
Naoufal Lakhssassi ◽  
Anubhav Pratap-Singh
Keyword(s):  
Ethyl Acetate ◽  
Aspergillus Flavus ◽  
Bioactive Compounds ◽  
Ethylenediaminetetraacetic Acid ◽  
Ethyl Acetate Extract ◽  
Antioxidant Properties ◽  
Antioxidant Compounds ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction

The present study proposes microwave-assisted extraction as a sustainable technique for the biosynthesis of bioactive compounds from rice fermented with Aspergillus flavus (koji). First, fermentation conditions (i.e., pH from 3–12, five temperatures from 20–40 °C, and four culture-fermentation media viz. wheat, wheat bran, malt and rice) were optimized for producing microbial bioactive compounds. Microwave extraction was performed at 2450 MHz and 500 W for 20, 30, and 40 s with seven solvents (distilled water, ethyl acetate, hexane, ethanol, chloroform, diethyl ether, and methanol). The obtained results revealed that ethyl acetate is the most appropriate solvent for extraction. Effects of this ethyl acetate extract were compared with a commercial synthetic antioxidant. Antioxidant properties were enhanced by preventing the oxidation of the linoleic acid (C18H32O2) with an inhibition rate (antioxidant efficacy) of 73.13%. Notably, the ferrous ion binding ability was marginally lower when compared to the disodium salt of ethylenediaminetetraacetic acid (EDTA). Additionally, the obtained total content of phenolic compounds in the ethyl acetate extract of fermented rice (koji) by Aspergillus flavus was 232.11 mg based on gallic acid/mL. Antioxidant compounds in the ethyl acetate extract of fermented rice showed stability under neutral conditions, as well as at high temperatures reaching 185 °C during 2 h, but were unstable under acidic and alkaline conditions. The results demonstrate the efficacy of novel microwave-assisted extraction technique for accelerating antioxidant production during rice fermentation.

scholarly journals Optimization of Microwave-Assisted Extraction of Antioxidants from Bamboo Shoots of Phyllostachys pubescens

Molecules ◽  
2020 ◽  
Vol 25 (1) ◽  
pp. 215 ◽  
Author(s):  
Gualtiero Milani ◽  
Francesca Curci ◽  
Maria Maddalena Cavalluzzi ◽  
Pasquale Crupi ◽  
Isabella Pisano ◽  
...  
Keyword(s):  
Antioxidant Properties ◽  
Extraction Process ◽  
Biologically Active ◽  
Total Phenolic ◽  
Phyllostachys Pubescens ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Bamboo Shoots ◽  
Assisted Extraction ◽  
Time And Energy

Bamboo is a well-known medicinal plant in Southeast Asia that recently has attracted attention for its high polyphenol content and its medical and nutraceutical applications. In this work, polyphenols have been recovered for the first time by microwave-assisted extraction (MAE) from an unusual Italian cultivar of Phyllostachys pubescens bamboo shoots. The effects of three independent variables, such as extraction time, temperature, and solid/liquid ratio, on polyphenol recovery yield were investigated and successfully optimized through the response surface methodology. We demonstrated that MAE is an excellent polyphenols extraction technique from bamboo shoots because the total phenolic content obtained under microwave irradiation optimal conditions (4 min at 105 °C with 6.25 mg/mL ratio) was about eight-fold higher than that obtained with the conventional extraction method. Furthermore, higher total flavonoid content was also obtained under MAE. Consistent with these results, MAE enhanced the extract antioxidant properties with significant improved DPPH, ABTS, and FRAP scavenging ability. Therefore, this innovative extraction process enhances the recovery of biologically active compounds from Phyllostachys pubescens bamboo shoots with a dramatic reduction of time and energy consumption, which paves the way for its industrial application in functional food production.

scholarly journals Influence of microwave assisted extraction on antioxidant and antiplasmodial activities of Trichilia roka extracts

2015 ◽  
Vol 4 (5) ◽  
pp. 248-252
Author(s):  
Olga Nana ◽  
◽  
Jean Momeni ◽  
Fabrice Fekam Boyom ◽  
Martin Benoît Ngassoum ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Properties ◽  
Model Systems ◽  
Antiplasmodial Activity ◽  
Root Bark ◽  
Microwave Assisted Extraction ◽  
Mechanical Agitation ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Β Carotene

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%..

scholarly journals PHYTOCHEMICAL AND PHARMACOLOGICAL ASPECTS OF ANTHRAQUINONES OF RHEUM AUSTRALE D. DON

2020 ◽  
Vol 6 (2) ◽  
pp. 114-119
Author(s):  
Dwi Hartanti ◽  
Arinda Nur Cahyani
Keyword(s):  
Phenolic Compounds ◽  
Extraction Method ◽  
Literature Search ◽  
Antioxidant Properties ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Chromatographic Techniques ◽  
Assisted Extraction ◽  
Pure Compounds ◽  
Rheum Australe

Anthraquinones are phenolic compounds known best for their laxative activity. Rheum australe D. Don (Indian rhubarb, Polygonaceae) is a prominent medicinal plant with anthraquinones as the bioactive compounds, among a few others. The online literature search was carried out to collect data on the phytochemistry and pharmacological activity of anthraquinones, particularly those isolated from R. australe. Anthraquinones are commonly found in the genera of Rheum, Senna, Aloe, Frangula, and Rubia, which can be quantitatively and qualitatively determined using both conventional and advanced analytical methods. The anthraquinones of R. australe were found in free and glycosidic forms, which were best extracted by the microwave-assisted extraction method. Various chromatographic techniques were commonly conducted to isolate the pure compounds. In addition to its laxative activity, anthraquinones of R. australe also showed potential antibacterial, cytotoxic, and antioxidant properties.

scholarly journals Microwave-Assisted Extraction of Curcuma longa L. Oil: Optimization, Chemical Structure and Composition, Antioxidant Activity and Comparison with Conventional Soxhlet Extraction

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1516
Author(s):  
Rut Fernández-Marín ◽  
Susana C. M. Fernandes ◽  
María A. Andrés ◽  
Jalel Labidi
Keyword(s):  
Antioxidant Activity ◽  
Curcuma Longa ◽  
Antioxidant Properties ◽  
Soxhlet Extraction ◽  
Extraction Yield ◽  
Total Phenolic ◽  
Microwave Assisted Extraction ◽  
Optimum Conditions ◽  
Microwave Assisted ◽  
Assisted Extraction

Curcuma root (Curcuma longa L.) is a very important plant in gastronomy and medicine for its unique antiseptic, anti-inflammatory, antimicrobial and antioxidant properties. Conventional methods for the extraction of curcuma oil require long extraction times and high temperatures that can degrade the active substances. Therefore, the objectives of the present study were: (i) first, to optimize the extraction yield of curcuma oil by applying a Box-Behnken experimental design using surface response methodology to the microwave-assisted extraction (MAE) technique (the independent variables studied were reaction time (10–30 min), microwave power (150–200 W) and curcuma powder/ethanol ratio (1:5–1:20; w/v); and, (ii) second, to assess the total phenolic content (TPC) and their antioxidant activity of the oil (at the optimum conditions point) and compare with the conventional Soxhlet technique. The optimum conditions for the MAE were found to be 29.99 min, 160 W and 1:20 w/v to obtain an optimum yield of 10.32%. Interestingly, the oil extracted by microwave-assisted extraction showed higher TPC and better antioxidant properties than the oil extracted with conventional Soxhlet technique. Thus, it was demonstrated that the method applied for extraction influences the final properties of the extracted Curcuma longa L. oil.

scholarly journals Exploring Ultrasound, Microwave and Ultrasound–Microwave Assisted Extraction Technologies to Increase the Extraction of Bioactive Compounds and Antioxidants from Brown Macroalgae

Marine Drugs ◽  
2020 ◽  
Vol 18 (3) ◽  
pp. 172 ◽  
Author(s):  
Marco Garcia-Vaquero ◽  
Viruja Ummat ◽  
Brijesh Tiwari ◽  
Gaurav Rajauria
Keyword(s):  
Antioxidant Properties ◽  
Principal Component ◽  
Soluble Carbohydrates ◽  
Microwave Assisted Extraction ◽  
Ultrasound Assisted Extraction ◽  
Brown Macroalgae ◽  
Sem Images ◽  
Clear Trend ◽  
Microwave Assisted ◽  
Assisted Extraction

This study aims to determine the influence of (1) ultrasound-assisted extraction (UAE), (2) microwave-assisted extraction (MAE) and (3) a combination of ultrasound–microwave-assisted extraction (UMAE) on the yields of fucose-sulphated polysaccharides (FSPs), total soluble carbohydrates and antioxidants extracted from A. nodosum. Scanning electron microscopy (SEM) was used to evaluate the influence of the extraction technologies on the surface of macroalgae while principal component analysis was used to assess the influence of the extraction forces on the yields of compounds. UMAE generated higher yields of compounds compared to UAE and MAE methods separately. The maximum yields of compounds achieved using UMAE were: FSPs (3533.75 ± 55.81 mg fucose/100 g dried macroalgae (dm)), total soluble carbohydrates (10408.72 ± 229.11 mg glucose equivalents/100 g dm) and phenolic compounds (2605.89 ± 192.97 mg gallic acid equivalents/100 g dm). The antioxidant properties of the extracts showed no clear trend or extreme improvements by using UAE, MAE or UMAE. The macroalgal cells were strongly altered by the application of MAE and UMAE, as revealed by the SEM images. Further research will be needed to understand the combined effect of sono-generated and microwave-induced modifications on macroalgae that will allow us to tailor the forces of extraction to target specific molecules.

Microwave-Assisted Extraction and Antioxidant Activities of Polyphenols from Camellia Fascicularis Leaves

2018 ◽  
Vol 17 (2) ◽  
pp. 164-171
Author(s):  
Liu Yun ◽  
Kan Huan ◽  
Fan Fang-Yu ◽  
Tang Jun-Rong ◽  
Zhang Ying-Jun ◽  
...  
Keyword(s):  
Microwave Power ◽  
Ethanol Concentration ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Raw Material ◽  
Optimum Process ◽  
Dependent Manner ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction

A microwave-assisted extraction method was established and optimized for extracting polyphenols from the leaves of Camellia fascicularis, which possess antioxidant properties. Microwave-assisted extraction of polyphenols from C. fascicularis leaves was optimized using response surface methodology. The influential factors, including ethanol concentration, ratio of liquid to raw material, and microwave power, were studied to optimize the extraction process, while setting the irradiation time to 20 s. The optimum process parameters, namely, ethanol concentration of 50%, the ratio of liquid to raw material of 32 mL/g, and microwave power of 160 W, contributed to the highest polyphenol yield of 106.1 mg GAE/g dw. The crude polyphenols were purified through an HP-20 macroporous adsorption resin column to obtain purified C. fascicularis polyphenols. Antioxidant assay demonstrated that purified polyphenols from C. fascicularis showed significant antioxidant activities in a concentration-dependent manner for scavenging hydroxyl, 2,2-diphenyl-1-picrylhydrazyl, and 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) radicals. Thus, microwave-assisted extraction was an effective method of extracting polyphenols from C. fascicularis leaves, which might be an excellent food material with potential antioxidant properties.

Optimization of Bioactive Compounds with Antioxidant Activity of Himanthalia elongata by Microwave-Assisted Extraction Using Response Surface Methodology

2021 ◽  
Vol 5 (1) ◽  
pp. 70
Author(s):  
Franklin Chamorro ◽  
Lucia Cassani ◽  
Catarina Lourenço-Lopes ◽  
Anxo Carreira-Casais ◽  
Maria Carpena ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Antioxidant Properties ◽  
Biological Properties ◽  
Total Phenolic ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Himanthalia Elongata ◽  
Biological Tests ◽  
Ethanol In Water

Himanthalia elongata is a brown alga used in applications in the food, pharmaceutical and nutraceutical industries due to its biological properties, such as antioxidant, anti-inflammatory, and antimicrobial, among others. These effects are attributed to the high content of nutrients and secondary metabolites, especially phenolic compounds. The objective of this study is to optimize the microwave-assisted extraction method to recover phenolic compounds and flavonoids, considering three extraction parameters: the concentration of ethanol in water, the extraction time and pressure. The total phenolic content and the total flavonoid content were evaluated, and two biological tests were performed to assess the antioxidant properties.

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