Direct steam injection pretreatment improves microwave-assisted extraction yield for total flavonoids and myricetin from Hovenia dulcis Thunb.

Deep eutectic solvents (DESs) have attracted significant attention as green media for the extraction and separation of natural compounds from Chinese medicine. In this study, a hydrophobic DESs-based microwave-assisted extraction (MAE) was successfully used to efficiently extract baicalin from Scutellaria baicalensis Georgi. Firstly, DecA: N4444-Cl (DES-1 , molar ratio 1 : 2) was screened and selected as the most appropriate DES by comparing the extraction yield in different hydrophobic DESs. Based on the extraction yield of baicalin, response surface methodology (RSM) was employed to model and optimize the parameters (extraction temperature, liquid-solid ratio, and extraction time). Furthermore, the maximum yield of 106.96 mg·g−1 was achieved under optimum conditions in DES-containing aqueous solutions (33 vol% water content), which reached a similar level that was conducted using the pharmacopoeia procedure (104.94 mg·g−1). These results indicated that the proposed method is an excellent alternative for the extraction of baicalin.

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Optimization of Microwave-Assisted Extraction of Residual Soybean Oil from Spent Bleaching Earth

E3S Web of Conferences ◽

10.1051/e3sconf/202130201009 ◽

2021 ◽

Vol 302 ◽

pp. 01009

Author(s):

Chanatip Dejkajorn ◽

Panawan Suttiarporn ◽

Hussanai Sukkathanyawat ◽

Kittisak Wichianwat ◽

Saichon Sriphan ◽

...

Keyword(s):

Soybean Oil ◽

Vegetable Oil ◽

Regression Coefficient ◽

Bleaching Earth ◽

Extraction Yield ◽

Microwave Assisted Extraction ◽

Ethanol Mixture ◽

Microwave Assisted ◽

Assisted Extraction ◽

Edible Vegetable Oil

Spent bleaching earth (SBE) which is generated from bleaching process is a valuable industrial waste of edible vegetable oil production because of residual edible vegetable oil absorbed. The residual oil in spent bleaching earth can be recovered and reused for application in the industries such as the production of biodiesel and lubricant. Currently, microwave-assisted extraction (MAE) technique is widely used because this method has a shorter extraction time and less solvent consumption when compared with traditional methods. In this study, MAE combined with solvent reflux was optimized using solvent screening experiments and response surface methodology (RSM) to obtain the highest yield of MAE extraction of residual soybean oil from spent bleaching earth. The extraction yield of residual soybean oil obtained from selected solvent were hexane-ethanol mixture (2:1 v/v, 10.19%) > hexane-ethanol mixture (1:1 v/v, 10.00%) >hexane-ethanol mixture (1:2 v/v, 9.98%) > hexane-ethanol mixture (1:3 v/v, 9.83%) > hexane-ethanol mixture (3:1 v/v, 8.59%) > hexane (8.17%) > acetone (7.73%). The regression coefficient (R-squared = 0.9852) expresses the accuracy of the regression and indicates the relationship between experimental data and predicted result, with high regression coefficient close to 1, which is remarkably desired. The experiment conditions for optimal MAE extraction of residual soybean oil from SBE were hexane-ethanol mixture (2:1 v/v), liquid to solid ratio 15.56:1 mL/g, extraction time 12.22 min, and microwave power 350 W. Under such conditions, the highest predicted value of the extraction yield of residual soybean oil was 10.43%.

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Optimization of Microwave-Assisted Extraction of Total Flavonoids from China-Hemp Leaves and Evaluation of Its Antioxidant Activities

Lecture Notes in Electrical Engineering - Advances in Applied Biotechnology ◽

10.1007/978-981-10-4801-2_57 ◽

2017 ◽

pp. 555-567 ◽

Cited By ~ 1

Author(s):

Jie Cao ◽

Limin Hao ◽

Liming Zhang ◽

Meng Xu ◽

Huanhuan Ge ◽

...

Keyword(s):

Antioxidant Activities ◽

Total Flavonoids ◽

Microwave Assisted Extraction ◽

Microwave Assisted ◽

Assisted Extraction

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Polyphenolic-Protein-Polysaccharide Complexes from Hovenia dulcis: Insights into Extraction Methods on Their Physicochemical Properties and In Vitro Bioactivities

Foods ◽

10.3390/foods9040456 ◽

2020 ◽

Vol 9 (4) ◽

pp. 456 ◽

Cited By ~ 1

Author(s):

Ding-Tao Wu ◽

Wen Liu ◽

Mei-Lin Xian ◽

Gang Du ◽

Xin Liu ◽

...

Keyword(s):

Physicochemical Properties ◽

Antioxidant Activities ◽

Extraction Methods ◽

Water Extraction ◽

Microwave Assisted Extraction ◽

Microwave Assisted ◽

Assisted Extraction ◽

Ultrasound Assisted ◽

Hovenia Dulcis

Seven extraction methods, including hot water extraction (HWE), pressurized water extraction (PWE), ultrasound-assisted extraction, microwave-assisted extraction, ultrasound-assisted enzymatic extraction, high-speed shearing homogenization extraction, and ultrasound-microwave-assisted extraction, were utilized to extract polyphenolic-protein-polysaccharide complexes (PPPs) from Hovenia dulcis. Next, their physicochemical properties and in vitro antioxidant activities, antiglycation effects, and inhibition activities on α-glucosidase and α-amylase were studied and compared. The findings from this study indicate that various extraction processes exhibit notable influences on the physicochemical properties and in vitro bioactivities of PPPs. Extraction yields, contents of polyphenolics and flavonoids, apparent viscosities, molecular weights, molar ratios of monosaccharide compositions, and ratios of amino acid compositions in PPPs varied in different extraction methods. Furthermore, 13 phenolic compounds in PPPs, including rutin, myricitrin, myricetin, quercetin, kaempferol, protocatechuic acid, gallocatechin, p-hydroxybenzoic acid, ampelopsin, quercetin-7,4′-diglucoside, dihydroquercetin, 5-methylmyricetin, and naringenin, were identified. The relatively strong in vitro antioxidant activities, antiglycation effects, and inhibition activities on α-glucosidase and α-amylase were determined in both PPP-W and PPP-P obtained by HWE and PWE, respectively. The high content of total polyphenolics may be one of the main contributors to their in vitro bioactivities. The findings have shown that the PWE method can be an appropriate method to prepare PPPs with strong bioactivities for application in the functional food industry.

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PENGARUH KONSENTRASI ETANOL TERHADAP AKTIVITAS ANTIOKSIDAN EKSTRAK DAUN SIRIH MERAH (Piper crocatum Ruitz & Pav) MENGGUNAKAN METODE MICROWAVE ASSISTED EXTRACTION (MAE)

Jurnal Ilmu dan Teknologi Pangan (ITEPA) ◽

10.24843/itepa.2019.v08.i03.p06 ◽

2019 ◽

Vol 8 (3) ◽

pp. 278

Author(s):

I Gede Tirta Yasa ◽

Nengah Kencana Putra ◽

Anak Agung Istri Sri Wiadnyani

Keyword(s):

Antioxidant Activity ◽

Ethanol Concentration ◽

Total Phenol ◽

Total Flavonoids ◽

Microwave Assisted Extraction ◽

Microwave Assisted ◽

Randomized Design ◽

Assisted Extraction ◽

Completely Randomized Design ◽

Test Treatment

This study was conducted to determine the effect of ethanol concentration on antioxidant activity and to obtain the highest antioxidant activity in red betel leaves extract using the MAE method. The experimental design used in this study was a completely randomized design (CRD) with an ethanol concentration treatment consisting of five levels, namely 50%, 60%, 70%, 80%, and 90%. All treatments were repeated three times to obtain 15 experimental units. The data obtained were analyzed by variance and if the treatment had significant effect followed by Duncan test. Treatment of ethanol concentration had a very significant effect (P <0.01) on yield, total phenol, total flavonoids, and antioxidant activity. The results showed that 90% ethanol concentration was the best treatment which produced a yield of 25.17%, total phenol 106.00 mg GAE / g extract, total flavonoids 46.98 mg QE / g and antioxidant activity based on IC50 at 81.61 ppm. Keywords : red betel leaves, ethanol, MAE, antioxidant activity.

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Microwave-assisted extraction of flavonoids from Phyllostachys heterocycla leaves: Optimization, mechanism, and antioxidant activity in vitro

BioResources ◽

10.15376/biores.16.4.8060-8081 ◽

2021 ◽

Vol 16 (4) ◽

pp. 8060-8081

Author(s):

Jie Xu ◽

Jianjun Wu ◽

Juan Qi ◽

Juan Li ◽

Yongju Liu ◽

...

Keyword(s):

Antioxidant Activities ◽

Radical Scavenging ◽

Soxhlet Extraction ◽

Extraction Yield ◽

Microwave Assisted Extraction ◽

Extraction Technology ◽

Microwave Assisted ◽

Assisted Extraction ◽

Phyllostachys Heterocycla

Flavonoids were extracted from Phyllostachys heterocycla leaves by adopting microwave-assisted extraction technology. Based on the single factor experiment and Plackett-Burman design results, the extraction process of flavonoids was further optimized using the response surface methodology. The optimum conditions were as follows: an ethanol concentration of 78.1%, an extraction time of 24.9 min, and a microwave power of 559 W. Under these conditions, the extraction yield of flavonoids was 4.67%, which was in close proximity to the predicted value (4.70%) and higher than the extraction yield from traditional Soxhlet extraction (3.35%). Moreover, the possible extraction mechanisms of these two extraction methods were further derived to explain why the microwave-assisted extraction of flavonoids was more efficient compared with traditional Soxhlet extraction. Ultimately, the antioxidant activities in vitro of flavonoids from Phyllostachys heterocycla leaves were evaluated via DPPH and ABTS radical scavenging assay. The flavonoids from Phyllostachys heterocycla leaves exhibited excellent antioxidant activities in vitro and Phyllostachys heterocycla leaves could be a new natural source for developing antioxidants. Overall, the findings of this research could provide a theoretical reference for the further comprehensive development and utilization of bamboo resources.

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Impact of Eutectic Solvents Utilization in the Microwave Assisted Extraction of Proanthocyanidins from Grape Pomace

Molecules ◽

10.3390/molecules27010246 ◽

2021 ◽

Vol 27 (1) ◽

pp. 246

Author(s):

Rodrigo T. Neto ◽

Sónia A. O. Santos ◽

Joana Oliveira ◽

Armando J. D. Silvestre

Keyword(s):

Lactic Acid ◽

Choline Chloride ◽

Extraction Yield ◽

Degree Of Polymerization ◽

Grape Pomace ◽

Microwave Assisted Extraction ◽

Microwave Assisted ◽

Assisted Extraction ◽

Effective Combination ◽

The Mean

The extraction of proanthocyanidins (PACs), despite being an important and limiting aspect of their industrial application, is still largely unexplored. Herein, the possibility of combining eutectic solvents (ESs) with microwave assisted extraction (MAE) in the extraction of PACs from grape pomace (GP) is explored, aiming to improve not only the extraction yield but also the mean degree of polymerization (mDP). The combination of choline chloride with lactic acid was shown to be the most effective combination for PACs extraction yield (135 mgPAC/gGP) and, despite the occurrence of some depolymerization, also enabled us to achieve the highest mDP (7.13). Additionally, the combination with MAE enabled the process to be completed in 3.56 min, resulting in a considerably reduced extraction time.

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

The North African Journal of Food and Nutrition Research - July-December 2021 ◽

10.51745/najfnr.5.11.53-68 ◽

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.

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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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Study on Microwave-Assisted Extraction of Polysaccharides from Radix astragali

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.675-677.1634 ◽

2014 ◽

Vol 675-677 ◽

pp. 1634-1637 ◽

Cited By ~ 1

Author(s):

Cong Liang Huang

Keyword(s):

Irradiation Time ◽

Good Alternative ◽

Extraction Yield ◽

Extraction Temperature ◽

Microwave Assisted Extraction ◽

Radix Astragali ◽

Solid Ratio ◽

Microwave Assisted ◽

Assisted Extraction ◽

Orthogonal Test Design

In this study, microwave-assisted extraction (MAE) was employed for the extraction of polysaccharides from Radix Astragali (PRA). The extraction parameters that influenced the extraction yield of PRA were optimized by orthogonal test design. The results showed that the optimal MAE conditions were as followings: liquid-solid ratio of 18 ml/g, irradiation time of 8 min, irradiation power of 300 W and extraction temperature of 65°C, while extraction yield of PRA was 8.39 %. The developed MAE method provided a good alternative for the extraction of PRA.

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