scholarly journals Microwave-assisted Extraction and Antioxidant Activity of Flavonoids from Sedum aizoon Leaves

2017 ◽  
Vol 23 (1) ◽  
pp. 111-118 ◽  
Author(s):  
Congbin Jin ◽  
Xiaocong Wei ◽  
Shuli Yang ◽  
Lingyun Yao ◽  
Gangming Gong
Keyword(s):  
Antioxidant Activity ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Sedum Aizoon

scholarly journals Microwave Assisted Extraction and Pressurized Liquid Extraction of Sulfated Polysaccharides from Fucus virsoides and Cystoseira barbata

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1481
Author(s):  
Ana Dobrinčić ◽  
Sandra Pedisić ◽  
Zoran Zorić ◽  
Mladenka Jurin ◽  
Marin Roje ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Liquid Extraction ◽  
Pressurized Liquid Extraction ◽  
Sulfate Group ◽  
Sulfated Polysaccharides ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Cystoseira Barbata

Sulfated polysaccharide fucoidan isolated from brown algae shows a wide range of biological activities that are significantly dependent on its chemical composition, which is closely related to the applied technique and extraction parameters. Therefore, the objective of this study was to evaluate the influence of microwave assisted extraction (MAE) and pressurized liquid extraction (PLE) parameters (solvent, temperature, time, and number of cycles) on the Fucus virsoides and Cystoseira barbata polysaccharide yield (%PS) and chemical composition (total sugar, fucose, and sulfate group). The optimal MAE parameters that resulted in the highest polysaccharide extraction from F. virsoides and C. barbata were 0.1 M H2SO4 for 10 min at 80 °C, while the optimal PLE parameters were 0.1 M H2SO4, for two cycles of 15 min at 140 °C. Furthermore, the %PS, chemical structure, molecular properties, and antioxidant activity of the F. virsoides and C. barbata polysaccharide extracts obtained with MAE, PLE, and conventional extraction (CE) performed under previously determinate optimal conditions were compared. PLE resulted in a significantly higher %PS from F. virsoides, while for C. barbata, a similar yield was achieved with CE and PLE, as well as CE and MAE, for both algae. Furthermore, the polysaccharides obtained using PLE had the highest polydispersity index, fucose, and sulfate group content, and the lowest uronic acid content; however their antioxidant activity was lower.

scholarly journals Microwave-Assisted Extraction and Ultrasound-Assisted Extraction of Bioactive Compounds from Grape Pomace

2020 ◽  
Vol 16 (1-2) ◽  
Author(s):  
Cassiano Brown da Rocha ◽  
Caciano Pelayo Zapata Noreña
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Bioactive Compounds ◽  
Grape Pomace ◽  
Total Phenolic ◽  
Microwave Assisted Extraction ◽  
Ultrasound Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Ultrasound Assisted

AbstractThe grape pomace is a by-product from the industrial processing of grape juice, which can be used as a source of bioactive compounds. The aim of this study was to separate the phenolic compounds from grape pomace using an acidic aqueous solution with 2 % citric acid as a solvent, using both ultrasound-assisted extraction, with powers of 250, 350 and 450 W and times of 5, 10 and 15 min, and microwave-assisted extraction using powers of 600, 800 and 1,000 W and times of 5, 7 and 10 min. The results showed that for both methods of extraction, the contents of total phenolic compounds and antioxidant activity by ABTS and DPPH increased with time, and microwave at 1,000 W for 10 min corresponded to the best extraction condition. However, the contents of phenolic compounds and antioxidant activity were lower than exhaustive extraction using acidified methanol solution.

Application of protic ionic liquids in the microwave-assisted extraction of phycobiliproteins from Arthrospira platensis with antioxidant activity

2020 ◽  
Vol 252 ◽  
pp. 117448 ◽  
Author(s):  
Renata Débora Pinto Rodrigues ◽  
Amanda Sousa e Silva ◽  
Thalita Adrielly Viana Carlos ◽  
Ana Karine Pessoa Bastos ◽  
Rílvia Saraiva de Santiago-Aguiar ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Ionic Liquids ◽  
Arthrospira Platensis ◽  
Microwave Assisted Extraction ◽  
Protic Ionic Liquids ◽  
Microwave Assisted ◽  
Assisted Extraction

scholarly journals Microwave-assisted extraction of Nigella sativa L. essential oil and evaluation of its antioxidant activity

2017 ◽  
Vol 54 (12) ◽  
pp. 3779-3790 ◽  
Author(s):  
Abdol-Samad Abedi ◽  
Marjan Rismanchi ◽  
Mehrnoush Shahdoostkhany ◽  
Abdorreza Mohammadi ◽  
Amir Mohammad Mortazavian
Keyword(s):  
Antioxidant Activity ◽  
Essential Oil ◽  
Nigella Sativa ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction

scholarly journals Ultrasound and Microwave Assisted Extraction of Opuntia Fruit Peels Biocompounds: Optimization and Comparison Using RSM-CCD

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3618 ◽  
Author(s):  
Bruno Melgar ◽  
Maria Inês Dias ◽  
Lillian Barros ◽  
Isabel C.F.R. Ferreira ◽  
Antonio D. Rodriguez-Lopez ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Bioactive Compounds ◽  
Bioactive Molecules ◽  
Specific Response ◽  
Microwave Assisted Extraction ◽  
Ultrasound Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Ic50 Values ◽  
Effective Models

Ultrasound-assisted extraction (UAE) and microwave-assisted extraction (MAE) of bioactive compounds, peels from Opuntia engelmannii cultivar (cv.) Valencia were optimized by response surface methodology. Randomized extraction runs were performed for each of the technologies employed in order to build effective models with maximum (bioactive molecules content and yield) and minimum (antioxidant activity) responses. A 5-level, 4-factor central composite design was used to obtain target responses as a function of extraction time (t), solid to liquid ratio (S/L), methanol concentration (metOH), and temperature (T). Specific response optimization for each technology was analyzed, discussed, and general optimization from all the responses together was also gather. The optimum values for each factor were: t = 2.5 and 1.4 min, S/L = 5 and 5 g/L, metOH = 34.6 and 0% of methanol and T = 30 and 36.6 °C, achieving maximum responses of 201.6 and 132.9 mg of betalains/g, 13.9 and 8.0 mg of phenolic acids/g, 2.4 and 1.5 mg of flavonoids/g, 71.8% and 79.1% of extractable solid and IC50 values for the antioxidant activity of 2.9 and 3.6, for UAE and MAE, respectively. The present study suggested UAE as the best extraction system, in order to maximize recovery of bioactive compounds with a high antioxidant activity.

scholarly journals Optimization of Microwave-Assisted Extraction of Polysaccharides from Ulva pertusa and Evaluation of Their Antioxidant Activity

Antioxidants ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 129 ◽  
Author(s):  
Bao Le ◽  
Kirill S. Golokhvast ◽  
Seung Hwan Yang ◽  
Sangmi Sun
Keyword(s):  
Antioxidant Activity ◽  
Superoxide Dismutase ◽  
Raw Material ◽  
Ulva Pertusa ◽  
Extraction Time ◽  
Oxidative Enzymes ◽  
Microwave Assisted Extraction ◽  
Extraction Technology ◽  
Microwave Assisted ◽  
Assisted Extraction

The use of green marine seaweed Ulva spp. as foods, feed supplements, and functional ingredients has gained increasing interest. Microwave-assisted extraction technology was employed to improve the extraction yield and composition of Ulva pertusa polysaccharides. The antioxidant activity of ulvan was also evaluated. The impacts of four independent variables, i.e., extraction time (X1, 30 to 60 min), power (X2, 500 to 700 W), water-to-raw-material ratio (X3, 40 to 70), and pH (X4, 5 to 7) were evaluated. The chemical structure of different polysaccharides fractions was investigated via FT-IR and the determination of their antioxidant activities. A response surface methodology based on a Box–Behnken design (BBD) was used to optimize the extraction conditions as follows: extraction time of 43.63 min, power level of 600 W, water-to-raw-material ratio of 55.45, pH of 6.57, and maximum yield of 41.91%, with a desired value of 0.381. Ulvan exerted a strong antioxidant effect against 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) and showed reducing power in vitro. Ulvan protected RAW 264.7 cells against H2O2-induced oxidative stress by upregulating the expression and enhancing the activity of oxidative enzymes such as superoxide dismutase (SOD) and superoxide dismutase (CAT). The results suggest that the polysaccharides from U. pertusa might be promising bioactive compounds for commercial use.

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