scholarly journals Ziziphus lotus (L.) Lam. plant treatment by ultrasounds and microwaves to improve antioxidants yield and quality: An overview

2021 ◽  
Vol 5 (12) ◽  
pp. 53-68
Author(s):  
Farida Berkani ◽  
Maria Luísa Serralheiro ◽  
Farid Dahmoune ◽  
Malik Mahdjoub ◽  
Nabil Kadri ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Extraction Yield ◽  
Point Of View ◽  
Microwave Assisted Extraction ◽  
Ultrasound Assisted Extraction ◽  
Microwave Assisted ◽  
Yield And Quality ◽  
Assisted Extraction ◽  
Industrialization Process ◽  
Ultrasound Assisted

The purpose of this review is to compile the literature published about different aspects of microwave-assisted extraction (MAE) use and ultrasound-assisted extraction (UAE) applied on jujube worldwide and to compare the results on the antioxidant activity obtained for each extraction method. As a result of the increased consumers demand for natural products, as well as for those of agro-food, nutraceutical, cosmetic industries, and green extraction techniques are nowadays trending to be potential alternatives that can improve antioxidant yield and its quality from an economical and environmental point of view by reducing time, energy, and solvent consumption. Ultrasounds and microwaves are widely used methods in the extraction of active principles due to their cavitation and dipolar rotation effect, respectively. These two techniques provide efficiency of extraction while minimizing the time and preserving the quality of the food matrix, overcoming the disadvantages of conventional techniques characterized by their consumption of large quantities of solvents and providing a sparse quantity of extraction. Jujube, a shrub with a high antioxidant potential, which can be affected by various extraction conditions can be the target of UAE and MAE to increase the antioxidant extraction yield. Exploiting the beneficial properties such as the antioxidant activity can lead to an industrialization process, replacing therefor synthetic antioxidants with natural compounds. These can also help in the development of new nutraceuticals and can be used, for instance, in agro-food industries as preservatives. Keywords : Microwave-assisted extraction (MAE), ultrasound-assisted extraction (UAE), antioxidants, Ziziphus lotus (L.) Lam plant.

scholarly journals Ziziphus lotus (L.) Lam. plant treatment by ultrasounds and microwaves to improve antioxidants yield and quality: An overview

2021 ◽  
Vol 5 (12) ◽  
pp. 53-68
Author(s):  
Farida Berkani ◽  
Maria Luísa Serralheiro ◽  
Farid Dahmoune ◽  
Malik Mahdjoub ◽  
Nabil Kadri ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Extraction Yield ◽  
Point Of View ◽  
Microwave Assisted Extraction ◽  
Ultrasound Assisted Extraction ◽  
Microwave Assisted ◽  
Yield And Quality ◽  
Assisted Extraction ◽  
Industrialization Process ◽  
Ultrasound Assisted

The purpose of this review is to compile the literature published about different aspects of microwave-assisted extraction (MAE) use and ultrasound-assisted extraction (UAE) applied on jujube worldwide and to compare the results on the antioxidant activity obtained for each extraction method. As a result of the increased consumers demand for natural products, as well as for those of agro-food, nutraceutical, cosmetic industries, and green extraction techniques are nowadays trending to be potential alternatives that can improve antioxidant yield and its quality from an economical and environmental point of view by reducing time, energy, and solvent consumption. Ultrasounds and microwaves are widely used methods in the extraction of active principles due to their cavitation and dipolar rotation effect, respectively. These two techniques provide efficiency of extraction while minimizing the time and preserving the quality of the food matrix, overcoming the disadvantages of conventional techniques characterized by their consumption of large quantities of solvents and providing a sparse quantity of extraction. Jujube, a shrub with a high antioxidant potential, which can be affected by various extraction conditions can be the target of UAE and MAE to increase the antioxidant extraction yield. Exploiting the beneficial properties such as the antioxidant activity can lead to an industrialization process, replacing therefor synthetic antioxidants with natural compounds. These can also help in the development of new nutraceuticals and can be used, for instance, in agro-food industries as preservatives. Keywords : Microwave-assisted extraction (MAE), ultrasound-assisted extraction (UAE), antioxidants, Ziziphus lotus (L.) Lam plant.

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.

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 Aqueous extraction of anions from coal and fly ash followed by ion-chromatographic determination

2016 ◽  
Vol 81 (12) ◽  
pp. 1441-1453
Author(s):  
Aleksandra Tasic ◽  
Ivana Sredovic-Ignjatovic ◽  
Ljubisa Ignjatovic ◽  
Danijel Djuranovic ◽  
Malisa Antic
Keyword(s):  
Fly Ash ◽  
Ph Value ◽  
Chromatographic Determination ◽  
Aqueous Extraction ◽  
Microwave Assisted Extraction ◽  
Ultrasound Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Coal Particles ◽  
Ultrasound Assisted

Three different techniques were applied for the aqueous extraction of anions from coal and fly ash: rotary mixer- and ultrasonic-assisted extraction with different duration time, and microwave-assisted extraction at different temperatures. Validation showed that the ion-chromatographic method was suitable for the analysis of anions in coal and fly ash extracts. The variations in the amounts of anions using different extraction times during rotary-assisted extraction were minimal for all investigated anions. The efficiency of ultrasound-assisted extraction of anions from coal depended on the sonication time and was highest at 30 min. The ultrasound-assisted extraction was less efficient for the extraction of anions from fly ash than rotary-assisted extraction. Increase of temperature in the microwave-assisted extraction had a positive effect on the amounts of all anions extracted from coal and sulphate from fly ash, while the amounts of fluoride and chloride in fly ash extracts decreased. The microwave-assisted extraction of coal at 150?C was compared with standard ASTM methods, and results were in good agreement only for chloride. Changes in the pH value and conductivity during ultrasound-assisted extraction were measured in order to explain changes on the surface of coal particles in contact with water and different processes that occur under environmental conditions.

scholarly journals Penentuan Total Fenol Ekstrak Umbi Bawang Dayak Hasil Ekstraksi Dengan Metode Ultrasound Assisted Extraction (UAE) dan Ultrasonic-Microwave Assisted Extraction (UMAE)

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Ashadi Sasongko ◽  
R Wahyu Nugroho ◽  
C Edra Setiawan ◽  
Indah W Utami ◽  
Memik D Pusfitasari
Keyword(s):  
Microwave Assisted Extraction ◽  
Ultrasound Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Ultrasound Assisted ◽  
Eleutherine Americana

Bawang dayak (Eleutherine americana) merupakan tanaman khas Kalimantan yang memiliki semua kandungan fitokimia antara lain alkaloid, glikosida, flavonoid, fenolik, steroid dan tanin. Senyawa fenolik berpotensi sebagai antioksidan.Ekstraksi senyawa bahan alam secara konvensional membutuhkan waktu yang lama dan dapat memicu kerusakan senyawa sehingga perlu metode yang lebih cepat dan efesien seperti metode Ultrasound Assisted Extraction (UAE) danUltrasound-Microwave Assisted Extraction (UMAE). Tujuan dari penelitian ini adalah untuk mengekstrak dan menentukan kadar senyawa fenolik dalam bawang dayak. Hasil yang optimal didapatkan dari waktu sonikasi selama 30 menit danvolume pelarut sebesar 240 mL.Penggunaan microwave dalam ekstraksi justru menimbulkan degradasi senyawa fenolik. Kata kunci: total fenol, bawang dayak, Eleutherine americana, UAE, UMAE

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.

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