Study on Microwave-Assisted Extraction of Polysaccharides from Radix astragali

2014 ◽  
Vol 675-677 ◽  
pp. 1634-1637 ◽  
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.

Microwave-Assisted Extraction of Chlorophyll from Filter Mud of Sugercane Mill and Component Analysis

2012 ◽  
Vol 518-523 ◽  
pp. 430-435 ◽  
Author(s):  
Hai Rong Guo ◽  
Shao Ying Ma ◽  
Xiao Fei Wang ◽  
Er Fang Ren ◽  
Yuan Yuan Li
Keyword(s):  
Irradiation Time ◽  
Extraction Time ◽  
Extraction Temperature ◽  
Microwave Assisted Extraction ◽  
Optimal Conditions ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Conventional Extraction ◽  
Filter Mud ◽  
Strong Absorption Peak

Microwave-assisted extraction (MAE) was used to extract chlorophylls from filter mud. Ethanol was used as the solvent. The optimal conditions for the MAE of chlorophylls were concluded from the study as the irradiation time, 50 s, the ratio of liquid to solid, 8:1 (mL/g), the extraction temperature, 40 °C, and the extraction time, 60 min. Compared with conventional extraction, the MAE of chlorophylls from the filter mud was more effective. The extraction time for MAE was 60 min with 0.277 mg/g chlorophyll yield, while conventional extraction needed 240 min with only about 0.259 mg/g chlorophyll yield. The Ultraviolet Absorption Spectra of the extracted chlorophylls showed that there was a strong absorption peak at about 663 nm. C=N, Mg-N and C-N was not seen existed from the infrared spectroscopy probably because that the mixed extracts were not purified and the chlorophyll content was less.

scholarly journals Deep Eutectic Solvent-Based Microwave-Assisted Extraction of Baicalin from Scutellaria baicalensis Georgi

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Hui Wang ◽  
Xiaodi Ma ◽  
Qibin Cheng ◽  
Xiaoli Xi ◽  
Liwei Zhang
Keyword(s):  
Maximum Yield ◽  
Deep Eutectic Solvent ◽  
Extraction Yield ◽  
Scutellaria Baicalensis ◽  
Molar Ratio ◽  
Extraction Temperature ◽  
Microwave Assisted Extraction ◽  
Scutellaria Baicalensis Georgi ◽  
Microwave Assisted ◽  
Assisted Extraction

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.

scholarly journals Microwave-assisted extraction of non-polar compounds from pistachio hull and characterization of extracts

2018 ◽  
Vol 69 (3) ◽  
pp. 260 ◽  
Author(s):  
H. N. Özbek ◽  
D. Koçak Yanık ◽  
S. Fadıloğlu ◽  
H. Keskin Çavdar ◽  
F. Göğüş
Keyword(s):  
Microwave Power ◽  
Polar Compounds ◽  
Good Alternative ◽  
Tocopherol Content ◽  
Extraction Time ◽  
Total Phenolic ◽  
Microwave Assisted Extraction ◽  
Solid Ratio ◽  
Microwave Assisted ◽  
Assisted Extraction

Soxhlet and microwave assisted extraction (MAE) methods were used to obtain non-polar compounds from pistachio hull. MAE parameters (liquid to solid ratio, microwave power, and extraction time) were studied to obtain maximum extraction yield. The optimal conditions were found to be liquid to solid ratio of 15:1 (v/w), microwave power of 250 W and extraction time of 12.5 min. The extraction yields were 9.81 and 9.50% for MAE and Soxhlet methods, respectively. The total phenolic content, antioxidant activity and tocopherol content of the extract obtained by MAE was found to be significantly higher than those of the Soxhlet extract (p < 0.05). The results showed that the extract contained α-tocopherols (567.65 mg/kg) and oleic acid (48.46%) as the major tocopherols and fatty acids. These findings propose that hull extracts can be considered as a good source of natural bioactive compounds and MAE can be a good alternative to the traditional Soxhlet method.

Concurrent Extraction and Purification of Gentiopicroside from Gentiana scabra Bunge Using Microwave-Assisted Ethanol-Salt Aqueous Two-Phase Systems

2019 ◽  
Vol 58 (1) ◽  
pp. 60-74
Author(s):  
Zhenyu Cheng ◽  
Haiyan Song ◽  
Yuewei Zhang ◽  
Dandan Han ◽  
Xue Yu ◽  
...  
Keyword(s):  
Potential Method ◽  
Extraction Yield ◽  
Phase System ◽  
Extraction Temperature ◽  
Two Phase ◽  
Gentiana Scabra ◽  
Solid Ratio ◽  
Microwave Assisted ◽  
Extraction And Purification ◽  
Assisted Extraction

Abstract A potential method called microwave-assisted aqueous two-phase extraction (MA-ATPE) was developed for concurrent extraction and purification of gentiopicroside from Gentiana scabra Bunge. Formation characteristics of aqueous two-phase system (ATPS) composed of ethanol and 25 kinds of salts were investigated; K2HPO4 (w/w, 21.71%) and ethanol (w/w, 40.72%) were determined to be the optimal compositions of ATPS. Response surface methodology based on Box–Behnken design was used to investigate the extraction conditions, the optimal parameters were summarized as follows: 80°C of extraction temperature, 31 s of extraction time, 11:1 (mL/g) of liquid-to-solid ratio, 100 meshes of particle size and 806 W of microwave power. Under these conditions, the extraction yield of gentiopicroside was 65.32 ± 0.24 mg/g with a recovery of 96.51%. Compared with other four methods, the purity of gentiopicroside in the crude extracts reached 17.16 ± 0.25%, which was significantly higher than that of smashing tissue extraction, microwave assisted-extraction, ultrasonic-assisted extraction and heat reflux extraction, respectively. In addition, the phase-forming salt can be recyclable. Therefore, MA-ATPE was an excellent and alternative technique to the conventional extraction approaches of gentiopicroside.

scholarly journals Microwave – Assisted Extraction of Chlorogenic Acid from Coffee liberica L

2015 ◽  
Vol 14 (2) ◽  
pp. 58 ◽  
Author(s):  
Josephine Q. Borja ◽  
Marylou M Uy ◽  
Jose Salvador Lim ◽  
Matthew Edson Ong ◽  
Alejandro Miguel Ros
Keyword(s):  
Chlorogenic Acid ◽  
Taguchi Design ◽  
Extraction Time ◽  
Extraction Temperature ◽  
Microwave Assisted Extraction ◽  
Solvent Concentration ◽  
Solid Ratio ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Effect On Yield

This study applied microwave-assisted extraction of chlorogenic acid (CGA) from Coffee liberica L. using ethanol as solvent. It sought to determine the effects of temperature, extraction time, solvent-to-solid ratio, and solvent concentration on the CGA yield expressed as gallic acid equivalent per litre (mg GAE L-1). The values of these factors were varied at three levels each and experiments were implemented using the L934 orthogonal array of the Taguchi design of experiment. Results showed that increasing the solvent-to-solid ratio from 2.5 to 7.5 mL g--1decreased the yield significantly. Conversely, increasing the solvent concentration from 0.6 to 0.7 (v v-1) increased the yield, but beyond this, lower yield was obtained. Likewise, yield increased when the extraction time was increased from 5 to 7 minutes but decreased subsequently when extraction was extended to 10 minutes. Temperature did not show significant effect on yield. Among the factors tested the solvent- to-solid ratio has the most significant effect on yield, followed by solvent concentration and extraction time while temperature had no significant effect. In the Taguchi design the highest yield of 304.90±0.58 mg GAE L-1 was obtained at 90°C, extraction time of 7 minutes, solvent-to-solid ratio of 2.5 mL g-1 and solvent concentration of 0.8 (v v-1). Using the same extraction temperature and time and solvent-to-solid ratio but lower solvent concentration, the confirmatory run resulted is significantly higher yield of 854.35±3.35 mg GAE L-1. Chlorogenic acid was identified in the extract at a concentration of 3152 mg L-1. By applying Soxhlet extraction using the same solvent concentration and solvent-to-solid ratio at the same temperature as that of the confirmatory run the yield was significantly lower at 570.42±5.3 mg GAE L-1.

scholarly journals Optimization of Ionic Liquid Based Simultaneous Ultrasonic- and Microwave-Assisted Extraction of Rutin and Quercetin from Leaves of Velvetleaf (Abutilon theophrasti) by Response Surface Methodology

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Chunjian Zhao ◽  
Zhicheng Lu ◽  
Chunying Li ◽  
Xin He ◽  
Zhao Li ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Extraction Time ◽  
Conventional Heating ◽  
Ultrasonic Power ◽  
Extraction Temperature ◽  
Microwave Assisted Extraction ◽  
Solid Ratio ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Influential Parameters

An ionic liquids based simultaneous ultrasonic and microwave assisted extraction (ILs-UMAE) method has been proposed for the extraction of rutin (RU), quercetin (QU), from velvetleaf leaves. The influential parameters of the ILs-UMAE were optimized by the single factor and the central composite design (CCD) experiments. A 2.00 M 1-butyl-3-methylimidazolium bromide ([C4mim]Br) was used as the experimental ionic liquid, extraction temperature 60°C, extraction time 12 min, liquid-solid ratio 32 mL/g, microwave power of 534 W, and a fixed ultrasonic power of 50 W. Compared to conventional heating reflux extraction (HRE), the RU and QU extraction yields obtained by ILs-UMAE were, respectively, 5.49 mg/g and 0.27 mg/g, which increased, respectively, 2.01-fold and 2.34-fold with the recoveries that were in the range of 97.62–102.36% for RU and 97.33–102.21% for QU with RSDs lower than 3.2% under the optimized UMAE conditions. In addition, the shorter extraction time was used in ILs-UMAE, compared with HRE. Therefore, ILs-UMAE was a rapid and an efficient method for the extraction of RU and QU from the leaves of velvetleaf.

scholarly journals Application of Ionic Liquids in the Microwave-Assisted Extraction of Pectin from Lemon Peels

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Huang Guolin ◽  
Shi Jeffrey ◽  
Zhang Kai ◽  
Huang Xiaolan
Keyword(s):  
Response Surface Methodology ◽  
Ionic Liquid ◽  
Fourier Transform ◽  
Extraction Temperature ◽  
Microwave Assisted Extraction ◽  
Optimal Parameters ◽  
Solid Ratio ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Scanning Electron

Microwave-assisted extraction of pectin from lemon peels by using ionic liquid as alternative solvent was investigated. The extracted pectin was detected by Fourier transform infrared spectra. The extraction conditions were optimized through the different experiments in conjunction with the response surface methodology. A pectin yield of 24.68 % was obtained under the optimal parameters: the extraction temperature of 88°C, the extraction time of 9.6 min, and a liquid-solid ratio of 22.7 ml⋅g-1. The structure of the pretreated lemon peel samples and the samples after microwave-assisted extraction were characterized by a field emission scanning electron microscope.

scholarly journals Optimisation of Sequential Microwave-Assisted Extraction of Essential Oil and Pigment from Lemon Peels Waste

Foods ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1493 ◽  
Author(s):  
Antonio Martínez-Abad ◽  
Marina Ramos ◽  
Mahmoud Hamzaoui ◽  
Stephane Kohnen ◽  
Alfonso Jiménez ◽  
...  
Keyword(s):  
Essential Oil ◽  
High Performance ◽  
Enrichment Factors ◽  
Extraction Yield ◽  
Array Detector ◽  
Microwave Assisted Extraction ◽  
Solid Ratio ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Main Components

In this work, a cascade approach to obtain different valuable fractions from lemon peels waste was optimised using microwave-assisted processes. Microwave-assisted hydrodistillation (MAHD) with a Clevenger apparatus was firstly used to obtain the lemon essential oil (LEO). The remaining residue was then submitted to microwave-assisted extraction (MAE) to extract the lemon pigment (LP). A Box–Behnken design was used to evaluate the influence of ethanol concentration, temperature and time in LP extraction in terms of extraction yield and colour intensity. Optimal extraction conditions for LP were 80% (v/v) ethanol, 80 °C and 50 min, with a liquid-to-solid ratio of 1:10. The obtained yields for LEO and LP were around 2 wt.% and 6 wt.%, respectively. The composition of LEO was analysed by gas chromatography with flame ionisation detection (GC-FID), and limonene (65.082 wt.%), β-pinene (14.517 wt.%) and γ-terpinene (9.743 wt.%) were mainly identified. LP was purified by using different Amberlite adsorption resins (XAD4, XAD7HP and XAD16N), showing XAD16N the best adsorption capacity. Enrichment factors of 4.3, 4.5 and 5.0 were found for eriocitrin, diosmin and hesperidin, respectively, which were detected as the main components in LP by ultra-high-performance liquid chromatography–diode array detector–tandem mass spectrometry (UPLC-DAD-MS) analysis, with final concentrations of 4.728 wt.%, 7.368 wt.% and 2.658 wt.%, respectively. Successful antimicrobial capacity against Escherichia coli and Staphylococcus aureus was obtained for LEO. The results from this work showed the potential of applying a cascading approach based on microwave-assisted processes to valorise lemon wastes, obtaining natural pigments and antimicrobials to be applied in food, cosmetic and polymer industries.

Analysis of Flavonoids in Acanthopanax by UV–Vis Spectrophotometry with Comparative Study on Different Extraction Technologies

2011 ◽  
Vol 236-238 ◽  
pp. 2630-2633 ◽  
Author(s):  
Ying Wang ◽  
Hong Tao Chu
Keyword(s):  
Irradiation Time ◽  
Correlation Coefficients ◽  
Soxhlet Extraction ◽  
Total Content ◽  
Extraction Temperature ◽  
Microwave Assisted Extraction ◽  
Acanthopanax Senticosus ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Solid Liquid

Acanthopanax Senticosus is a traditional medicinal plant in China. Flavonoids are one of the main active ingredients of this plant. Four extraction technologies of flavonoids from Acanthopanax Senticosus were investigated and compared, including microwave-assisted extraction, ultrasonic extraction, reflux extraction and Soxhlet extraction. The results showed that microwave-assisted extraction was most suitable for the extraction of flavonoids from Acanthopanax Senticosus because of its high effect and short extraction time. The found optimum extraction conditions were that the ethanol concentration was 50% (v/v), solid–liquid ratio was 1:50, extraction temperature was 50°C and irradiation time was 9 min. Quantification was performed by means of UV–Vis spectrophotometry with chromogenic system of NaNO2–Al (NO3)3–NaOH. Under the optimum conditions, the calibration curve for the analyte was linear with the correlation coefficients greater than 0.9999. The average recovery was 101.8%, and its RSD was 0.87%(n=5). The total content of flavonoids was18.72 mg g−1.

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