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.

Choline taurinate: a new biocompatible amino-functionalized ionic liquid as basic catalyst and extraction solvent

2018 ◽  
Vol 7 (3) ◽  
pp. 191-197 ◽  
Author(s):  
Wenxiu Deng ◽  
Lujie Liu ◽  
Yanqing Peng
Keyword(s):  
Ionic Liquid ◽  
Aromatic Aldehydes ◽  
Extraction Process ◽  
Significant Loss ◽  
Test Reaction ◽  
Base Interaction ◽  
Functionalized Ionic Liquid ◽  
Extraction Solvent ◽  
Basic Ionic Liquid ◽  
Vis Spectroscopy

Abstract A new biocompatible amino-functionalized ionic liquid composed solely of biomaterials was synthesized from taurine and choline hydroxide, and its physical properties (density, viscosity, miscibility and thermal stability) were also determined. The classic base-promoted three-component cyclic condensation of aromatic aldehydes, malononitrile and dimedone was chosen as the test reaction to demonstrate the catalytic activity of choline taurinate ([Ch][Tau]). The catalyst could be recovered and reused several times with no significant loss of activity. As a basic ionic liquid, [Ch][Tau] can extract acidic compounds from immiscible solvents through acid-base interaction. The extraction process of fluorescent dye Rhodamine B was monitored using ultraviolet-visible (UV-Vis) spectroscopy, by which the percentage extraction rate was determined as 95%.

Green Biodiesel Production Catalyzed by Basic Ionic Liquid

2013 ◽  
Vol 291-294 ◽  
pp. 379-382 ◽  
Author(s):  
Yong Gang Guo ◽  
Bao Hua Huang ◽  
Na Shi ◽  
Xiao Zhong Ma ◽  
Yan Ping Huo ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Processing Time ◽  
Biodiesel Production ◽  
Efficient Catalyst ◽  
Basic Ionic Liquid ◽  
Alkyl Side Chains ◽  
Biphasic Systems ◽  
Operational Simplicity

Transesterification were carried out under microwave irradiation conditions and the effects of imidazolium hydroxide with different branched alkyl side-chains ([Cnmim]OH, n = 2, 3, 4) were investigated. The results showed that less than conventional amount of NaOH, and the alkaline ionic liquids formed clearly biphasic systems immediately after the transesterification of soybean oil with methanol was finished. The method offers significant improvement over conventional techniques in terms of operational simplicity, processing time reduction and excellent yields. Among the imidazolium salts studied, [C2mim]OH proved to be the most efficient catalyst, affording 96 % yield.

ChemInform Abstract: An Efficient One-Pot Regioselective Approach Towards the Synthesis of Thiopyrano[2,3-d]thiazole-2-thiones Catalyzed by Basic Ionic Liquid under Microwave Irradiation.

ChemInform ◽  
2016 ◽  
Vol 47 (36) ◽  
Author(s):  
I. R. Siddiqui ◽  
Arjita Srivastava ◽  
Shayna Shamim ◽  
Anjali Srivastava ◽  
Anjali Shireen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
One Pot ◽  
Basic Ionic Liquid

scholarly journals Coupling Ultrasound with Heat-Reflux to Improve the Extraction of Quercetin, Kaempferol, Ginkgetin and Sciadopitysin from Mairei Yew Leaves

2019 ◽  
Vol 9 (4) ◽  
pp. 795
Author(s):  
Chunjian Zhao ◽  
Xueting Ren ◽  
Chunying Li ◽  
Hongwei Jiang ◽  
Jiajing Guan ◽  
...  
Keyword(s):  
Total Yield ◽  
Maximum Yield ◽  
Extraction Time ◽  
High Yield ◽  
Ultrasonic Power ◽  
Box Behnken Design ◽  
Extraction Solvent ◽  
Solid Ratio ◽  
Assisted Extraction ◽  
Ultrasonic Assisted

The coupling of ultrasound and heat–reflux extraction (UHRE) was developed for separation for quercetin (QU), kaempferol (KA), ginkgetin (GI) and sciadopitysin (SC) from Mairei Yew leaves. The Box–Behnken design was used to optimize the UHRE conditions for obtaining the maximum yield of flavonoids. The optimal extraction conditions were as follows: boiling 80% methanol (V/V) for extraction solvent, 20 min for the extraction time, 200 W for the ultrasonic power and 26 mL/g for the liquid–solid ratio. By UHRE, the yields of QU, KA, GI and SC were, respectively, 0.109, 0.406, 0.031 and 0.355 mg/g, and total yield of four flavonoids was 0.901 mg/g, which were, respectively, 1.25-fold and 1.23-fold higher than those by using ultrasonic-assisted extraction (UAE) and heating reflux extraction (HRE). Moreover, the extraction time for the equilibrium yields of flavonoids using UHRE was 83.3% and 27.8%, respectively, less than the corresponding time using UAE and HRE. Compared with HRE and UAE, UHRE showed the increase of cell disruption degree as observed by scanning electron microscopy, which may be the reason for high yield and rapid extraction of target compounds.

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.

An Efficient One-Pot Regioselective Approach Towards the Synthesis of Thiopyrano[2,3-d]thiazole-2-thiones Catalyzed by Basic Ionic Liquid under Microwave Irradiation

2015 ◽  
Vol 53 (3) ◽  
pp. 849-858 ◽  
Author(s):  
I. R. Siddiqui ◽  
Arjita Srivastava ◽  
Shayna Shamim ◽  
Anjali Srivastava ◽  
Shireen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
One Pot ◽  
Basic Ionic Liquid

Catalytic Performance of Imidazolide Basic Ionic Liquid in Knoevenagel Reactions in Aqueous Media

2011 ◽  
Vol 32 (4) ◽  
pp. 693-698
Author(s):  
Xuewei CHEN ◽  
Hongbing SONG ◽  
Xuehui LI ◽  
Furong WANG ◽  
Yu QIAN
Keyword(s):  
Ionic Liquid ◽  
Aqueous Media ◽  
Catalytic Performance ◽  
Basic Ionic Liquid

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.

Microwave Assisted Multi-Stage Countercurrent Extraction of Dihydromyricetin from Ampelopsis grossedentataa

2011 ◽  
Vol 7 (4) ◽  
Author(s):  
Wei Li ◽  
Cheng Zheng ◽  
Jian Zhao ◽  
Zhengxiang Ning
Keyword(s):  
Extraction Efficiency ◽  
Extraction Process ◽  
Extraction Time ◽  
Countercurrent Extraction ◽  
Bioactive Substances ◽  
Extraction Solvent ◽  
Microwave Assisted ◽  
Multi Stage ◽  
The Matrix ◽  
Substantial Concentration

A novel microwave assisted multi-stage countercurrent extraction (MAMCE) technique was developed for the extraction of dihydromyricetin from Chinese rattan tea, Ampelopsis grossedentata. The technique combined the advantages of microwave heating and dynamic multi-stage countercurrent extraction and achieved marked improvement in extraction efficiency over microwave assisted batch extraction. Analysis of dihydromyricetin concentrations in the solvent and matrix throughout the extraction process showed that by dividing the extraction into multiple stages and exchanging of solvents between stages, steady and substantial concentration gradients were established between the matrix and solvent, thus enabling the achievement of high extraction efficiency. The yield of dihydromyricetin was significantly affected by temperature, pH, solvent/material ratio and extraction time, and optimal extraction conditions were found to be 80-100°C, at acidic pH with a solvent/material ratio of 25-30 to 1 and extraction time of 5-10 min. With the high extraction efficiency and low usage of extraction solvent, MAMCE could prove to be a promising extraction technique which can be applied to the extraction of dihydromyricentin and other bioactive substances from natural materials.

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