scholarly journals Optimization of Vacuum Microwave-Mediated Extraction of Syringoside and Oleuropein from Twigs of Syringa oblata

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Xiangping Liu ◽  
Xuemin Jing ◽  
Guoliang Li
Keyword(s):  
Microwave Irradiation ◽  
Volume Fraction ◽  
Irradiation Time ◽  
Suitable Method ◽  
Optimal Parameters ◽  
Soaking Time ◽  
Solid Ratio ◽  
Vacuum Microwave ◽  
Irradiation Power ◽  
Conventional Methods

A vacuum microwave-mediated method was used to extract syringoside and oleuropein from Syringa oblata twigs. The optimal extraction conditions were an ethanol volume fraction of 40%, a liquid-solid ratio of 17 mL/g, 1 h of soaking time, −0.08 MPa of vacuum, a microwave irradiation power of 524 W, and a microwave irradiation time of 8 min. Under optimal parameters, the maximum yields of syringoside (5.92 ± 0.24 mg/g) and oleuropein (4.02 ± 0.18 mg/g) were obtained. The proposed method is more efficient than conventional methods for extracting syringoside and oleuropein from Syringa oblata. Moreover, less energy and time were required. The results implied that vacuum microwave-mediated extraction is a suitable method for the extraction of thermosensitive glycosides such as syringoside and oleuropein.

Synthesis of P(AA-AM)/ Organic Montmorillonite Super Absorbent Resin under Focused Signal-Mode Microwave Irradiation

2013 ◽  
Vol 746 ◽  
pp. 137-141
Author(s):  
Shui Li Lai ◽  
Ying Hua Gao
Keyword(s):  
Microwave Irradiation ◽  
Cetyltrimethylammonium Bromide ◽  
Irradiation Time ◽  
Single Mode ◽  
Synthesis System ◽  
Organic Montmorillonite ◽  
Irradiation Power ◽  
Aqueous Solution Polymerization ◽  
Signal Mode ◽  
Irradiation Technology

A super absorbent resin (SAR) of acrylic acid (AA)/acrylamide (AM) /organic montmorillonite (OMMT) composite was synthesized by aqueous solution polymerization. This process was carried out under precision microwave organic synthesis system and its single-mode focusing microwave irradiation technology was studied. The montmorillonite (MMT) was modified by treating with cetyltrimethylammonium bromide. Moreover, the factors that effect on liquid absorbency rate of the SAR were discussed, such as neutralization degree (ND) of AA, microwave irradiation time, microwave irradiation power and the dosage of the OMMT. It gave the best liquid absorbency rate (1520g.g-1 and 165g.g-1 in purified water and 0.9wt% NaCl solution, respectively).

Study on Preparation of Activated Carbon from Corncob Furfural Residue with ZnCl2 by Microwave Irradiation

2010 ◽  
Vol 152-153 ◽  
pp. 1322-1327 ◽  
Author(s):  
Cong Jin Chen ◽  
Long Bin Wei ◽  
Peng Cheng Zhao ◽  
Yue Li ◽  
Hua Yu Hu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Microwave Irradiation ◽  
Mass Concentration ◽  
Ph Value ◽  
Irradiation Time ◽  
Carbon Yield ◽  
Solution Ph ◽  
Soaking Time ◽  
Furfural Residue

In this paper, the feasibility of preparing activated carbon from corncob furfural residue with ZnCl2 by microwave irradiation was studied. The effect of the ratio by weight of ZnCl2 to corncob furfural residue, ZnCl2 solution soaking time, microwave irradiation time and the pH value of ZnCl2 solution on the quality of activated carbon was investigated. On the condition that the microwave power is 800 W and ZnCl2 solution mass concentration is 50%, the best technological parameter on preparing activated carbon with ZnCl2 by microwave irradiation is obtained: at the ratio of 3.5:1 by weight of ZnCl2 to corncob furfural residue, microwave irradiation time is 20 min, ZnCl2 solution soaking time is 12 h, the pH value of ZnCl2 solution is 2, the activated carbon yield reached 33.1% and the decolorizing capacity for methylene blue is 202.5 mg/g, the product is used in treating Cr6+ solution(pH value 4.0, concentration 50 mg/L), its adsorption capacity of Cr6+ is 7.583 mg/g.

scholarly journals Microwave-Assisted Method for Simultaneous Hydrolysis and Extraction for Preparation of Geniposidic Acid fromEucommia ulmoidesBark Using Basic Imidazolide Ionic Liquid

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Lili Li ◽  
Yupin Guo ◽  
Chunchao Zhao ◽  
Mengxia Wei ◽  
Junling Liu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
Irradiation Time ◽  
Bioactive Substances ◽  
Plant Materials ◽  
Box Behnken Design ◽  
Extraction Solvent ◽  
Solid Ratio ◽  
Basic Ionic Liquid ◽  
Geniposidic Acid

In order to hydrolyze geniposide and extract geniposidic acid, a novel microwave irradiation heating method for simultaneous hydrolysis and extraction for preparation of geniposidic acid fromEucommia ulmoidesbark using basic imidazolide ionic liquid was developed in this work. Basic ionic liquid paired by imidazolide anion and 1-hexyl-3-methylimidazolium cation ([C6mim]Im) was used as a dual hydrolysis catalyst and extraction solvent in the proposed approach. The optimal concentration of [C6mim]Im was 0.4 mol/L. And the independent parameters optimized by Box-Behnken design (BBD) based on single-factor tests were as follows: microwave irradiation time of 20 min at power of 415 W and liquid-solid ratio of 15 mL/g. Yield of geniposidic acid was increased to3.41±0.17 μmol/g. DM130 macroporous resin, after reaction, was selected to separate geniposidic acid from hydrolysate. The plant materials with different treatment were analyzed by scanning electron microscopy (SEM) and thermogravimetric analysis (TG). The analysis of SEM and TG further indicated that IMSHE is an efficient preparation method for geniposidic acid. It is reasonable to assume that the method and the dual hydrolysis catalyst and extraction solvent would offer an alternative for the preparation of some other kinds of bioactive substances from plant materials.

Preparation of Polymer Suppressant in Coal Transportation under Single Mode Microwave Irradiation

2012 ◽  
Vol 198-199 ◽  
pp. 19-22
Author(s):  
Shui Li Lai ◽  
Ying Hua Gao ◽  
Qiang Chai
Keyword(s):  
Acrylic Acid ◽  
Microwave Irradiation ◽  
Irradiation Time ◽  
Weight Ratio ◽  
Single Mode ◽  
Solution Polymerization ◽  
Oxidized Starch ◽  
Irradiation Power ◽  
Aqueous Solution Polymerization ◽  
Radiation Time

The aqueous solution polymerization of acrylic acid, acrylamide and oxidized starch under single mode microwave irradiation was studied, and a polymer suppressant was synthesized. The factors that influence on performance of the polymer suppressant were discussed, including microwave irradiation time, neutralization degree of acrylic acid (AA), the dosage of oxidized starch. The polymer suppressant was characterized by IR and scanning electron microscopy (SEM). Results indicated that the optimal synthetic conditions are as follows: microwave irradiation power, 300 W; radiation time, 2 mins; 50% neutralization degree of the AA; m(AA) : m(AM) : m(oxidized starch)= 5.0 : 3.3 : 3.4, weight ratio initiator in the feed is 0.4%, respectively.

Orthogonal Analysis Methodology for the Extraction of Polysaccharides from the Root of Rhodiola sachalinensis A. BOR and Evaluation its Hypoglycemic Effects

2014 ◽  
Vol 694 ◽  
pp. 576-579 ◽  
Author(s):  
Yan Liang ◽  
Feng Lin Li ◽  
Chuan Jun Zhang ◽  
Hui Yu
Keyword(s):  
Irradiation Time ◽  
Serum Insulin ◽  
Fasting Blood Glucose ◽  
Rhodiola Sachalinensis ◽  
Solid Ratio ◽  
Analysis Methodology ◽  
Assisted Extraction ◽  
Irradiation Power ◽  
Body Weights ◽  
Orthogonal Analysis

The present study was carried out to establish the optimum microwave-assisted extraction (MAE) conditions of polysaccharides from root ofRhodiola sachalinensisA. BOR (RSPs) by using o orthogonal analysis methodology. Moreover, the hypoglycemic effects of RSPs were investigated. The results indicated that the optimal extraction conditions of RSPs were liquid-solid ratio of 45:1 mL/g, irradiation power of 480 W, and irradiation time of 8 min. The animal experiment results demonstrated that RSPs could significantly increase body weights, serum insulin levels, and reduce fasting blood glucose (FBG) levels, which suggested that RSPs possesses hypoglycemic effects,.

Research on the Microwave-Assisted Supercritical CO2 Extraction of Alkaloids from Gynura segetum (Lour.) Merr.

2014 ◽  
Vol 988 ◽  
pp. 390-396 ◽  
Author(s):  
Qin Fang Lu ◽  
Li Fang Pan ◽  
Ming Chen ◽  
Yong Qiu ◽  
Bao Hua Xie
Keyword(s):  
Infrared Spectroscopy ◽  
Microwave Irradiation ◽  
Extraction Method ◽  
Ethanol Concentration ◽  
Irradiation Time ◽  
Experimental Conditions ◽  
Soaking Time ◽  
Microwave Assisted ◽  
Water Solvent ◽  
Main Component

In this study, the alkaloids from Gynura Segetum (Lour.) Merr. were extracted based on the microwave-assisted supercritical CO2 extraction technique. Before extraction, the powder of Gynura Segetum (Lour.) Merr. was firstly soaked with ethanol-water solvent and irradiated by microwave The experimental conditions including ethanol concentration, soaking time and microwave irradiation time were carefully studied, and the best efficiency could be obtained when the ethanol concentration, soaking time and microwave irradiation time were respectively 90%, 10 h and 2 min. Meanwhile, a parallel experiment with only supercritical CO2 extraction was also carried out as a comparison. The results indicated the efficiency of microwave-assisted supercritical CO2 extraction method was better for extracting the alkaloids from Gynura Segetum (Lour.) Merr. samples. Finally, the structures of the crystals extracted from the Gynura Segetum (Lour.) Merr. were analyzed by infrared spectroscopy, and the seneciphylline was found as the main component of the crystals.

Microwave-Irradiation Induced Fast Simultaneous Extraction of Methoxylated and Hydroxylated Phenolic Compounds from Orthosiphon stamineus Leaves

2017 ◽  
Vol 890 ◽  
pp. 155-158 ◽  
Author(s):  
Sook Fun Pang ◽  
Mei Zhu Lau ◽  
Mashitah M. Yusoff ◽  
Jolius Gimbun
Keyword(s):  
Phenolic Compounds ◽  
Microwave Irradiation ◽  
Extraction Yield ◽  
Extraction Time ◽  
Solvent Ratio ◽  
Simultaneous Extraction ◽  
Orthosiphon Stamineus ◽  
Solid Ratio ◽  
Aqueous Solvent ◽  
Irradiation Power

A combined effect of microwave irradiation and solvent types on the phenolic compounds extraction from Orthosiphon stamineus leaves was studied. The effect of as extraction time, the microwave irradiation power and solid to solvent ratio on the extraction yield was studied. Aqueous solvent provides a broader range of polarity than the pure solvent, and hence enabled a simultaneous extraction of both methoxylated and hydroxylated phenolic compounds. It was found that the extraction time of 2 minutes, microwave irradiation power at 300W and 20:1 solvent to solid ratio yielded highest simultaneous extraction of polyphenols (i.e. rosmarinic acid 32.45 mg RA/g DW, sinensetin 261.15 μg Sin/g DW and eupatorin 2.27 mg Eup/g DW). Result from this work may serve as a useful guide to obtain higher yield of polyphenols from O. stamineus.

scholarly journals Optimization of Vacuum-Microwave Radiation Pretreatment on Extraction ofGanodermaPolysaccharides

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
C. F. Song ◽  
S. G. Wang ◽  
J. Yang ◽  
Z. W. Cui ◽  
Y. H. Gu
Keyword(s):  
Irradiation Time ◽  
Extraction Yield ◽  
Hot Water ◽  
Optimal Parameters ◽  
Technological Parameters ◽  
Interaction Terms ◽  
Vacuum Microwave ◽  
Responsive Surfaces ◽  
New Process ◽  
Central Composite

A new process of vacuum-microwave (VM) radiation pretreatment for extracting polysaccharides from theGanoderma lucidumwas proposed, and the parameters were optimized by response surface methodology (RSM). The orthogonal-central composite design scheme was used and the responsive surfaces methodology of three factors and five levels was adopted, and the factors influencing the technological parameters and its interaction terms were analyzed and regressed. The optimal parameters were obtained as follows: the infiltration time of 70 min, microwave power density of 11.2 W/g, and VM irradiation time of 180 s. In consequence, the extraction yield was up to 1.775% when VM radiation was conducted in advance. Compared to the traditional hot-water extraction method, VM pretreatment can shorten the extraction time by more than a half, and the polysaccharide extraction yield was increased by 48.1%. It holds significant potential for further investigation, development, and application.

Eco-Friendly Synthesis of Pyrazoline Derivatives

2017 ◽  
Vol 9 (04) ◽  
Author(s):  
Mahesh G. Kharatmol ◽  
Deepali Jagdale
Keyword(s):  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Organic Synthesis ◽  
Ultrasonic Irradiation ◽  
Minimal Energy ◽  
Anticancer Activities ◽  
Conventional Methods

Pyrazoline class of compounds serve as better moieties for an array of treatments, they have antibacterial, antifungal, antiinflammatory, antipyretic, diuretic, cardiovascular activities. Apart from these they also have anticancer activities. So, pertaining to its importance, many attempts are made to synthesize pyrazolines. Since conventional methods of organic synthesis are energy and time consuming. There are elaborate pathways for green and eco-friendly synthesis of pyrazoline derivatives including microwave irradiation, ultrasonic irradiation, grinding and use of ionic liquids which assures the synthesis of the same within much lesser time and by use of minimal energy

scholarly journals Effects of microwave irradiation on the moisture content of various wood chip fractions obtained from different tree species

2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Monika Aniszewska ◽  
Krzysztof Słowiński ◽  
Ewa Tulska ◽  
Witold Zychowicz
Keyword(s):  
Moisture Content ◽  
Microwave Irradiation ◽  
Microwave Power ◽  
Irradiation Time ◽  
Initial Moisture Content ◽  
Radiant Energy ◽  
Wood Chip ◽  
Wood Chips ◽  
Chip Size ◽  
Drying Rates

AbstractThe paper proposes the use of microwave irradiation to lower the initial moisture content of wood chips. The study involved willow and fir chips fractionated by means of a sieve separator and unfractionated ash chips. The wood chips were exposed to a constant microwave power of 800 W for 30 s, 60 s, 120 s and 180 s. The chips were weighed before and after irradiation to measure loss of moisture. It was found that the decline in moisture content increased with wood chip size for a given irradiation time and microwave power. The initial moisture content of wood chips was not found to significantly affect loss of moisture as the drying rates of wood chips with higher and lower moisture content exposed to microwaves were not statistically different. The results showed that irradiation intensity increased with the time of exposure to microwaves and unit radiant energy per unit of evaporated moisture decreased with increasing wood chip size in the 3.15–31.50 mm range.

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