Ultrasound assisted preparation, characterization and adsorption study of ternary chitosan-ZnO-TiO2 nanocomposite: Advantage over conventional method

2019 ◽  
Vol 52 ◽  
pp. 120-130 ◽  
Author(s):  
B.A. Bhanvase ◽  
A. Veer ◽  
S.R. Shirsath ◽  
S.H. Sonawane
Keyword(s):  
Conventional Method ◽  
Adsorption Study ◽  
Ultrasound Assisted

Ultrasound-assisted heating extraction of pectin from grapefruit peel: Optimization and comparison with the conventional method

2015 ◽  
Vol 178 ◽  
pp. 106-114 ◽  
Author(s):  
Wenjun Wang ◽  
Xiaobin Ma ◽  
Yuting Xu ◽  
Yongqiang Cao ◽  
Zhumao Jiang ◽  
...  
Keyword(s):  
Conventional Method ◽  
Grapefruit Peel ◽  
Ultrasound Assisted

scholarly journals Ultrasound-Assisted Method for the Synthesis of Tertiary Fatty Aliphatic Esters with Potential Antimicrobial Activity

2020 ◽  
Vol 10 (6) ◽  
pp. 6829-6836
Keyword(s):  
Fatty Acid ◽  
Reaction Time ◽  
Conventional Method ◽  
Ultrasonic Irradiation ◽  
Spectroscopic Studies ◽  
Fatty Acid Esters ◽  
Aliphatic Esters ◽  
Ultrasound Assisted ◽  
The Impact ◽  
Acid Esters

This study aims to demonstrate a simple and rapid “green” method for the ultrasound-assisted synthesis of t-aliphatic esters by reacting t -butanol with saturated (capric, lauric, palmitic) and unsaturated (oleic and undecylenic) acids. The spectral characterization of esters was performed by IR and NMR spectroscopies. The impact of ultrasonic irradiation on the reaction in comparison with the conventional method was analyzed based on the reaction time and the yield of the resulting esters. After spectroscopic studies, the synthesis of the corresponding esters after the ultrasound-assisted irradiation was proven. The yields of the t-butyl fatty acid esters increased between 2 and 10% in comparison with the conventional method for their synthesis. It was also established that the application of ultrasonic irradiation intensifies the esterification process significantly compared to the conventional method. The advantages of the ultrasound-assisted esterification include shortening the reaction time; the process is carried out at room temperature instead of at the conventional reaction temperature 67-70oC. The application of ultrasonic-assisted irradiation for esterification is a suitable and promising method to reduce energy consumption, shortening the reaction time, and increasing the yield of t -butyl fatty acid esters.

Intensification of enzyme catalysed synthesis of hexyl acetate using sonication

2017 ◽  
Vol 6 (1) ◽  
Author(s):  
Ashwini R. Deshmukh ◽  
Virendra K. Rathod
Keyword(s):  
Conventional Method ◽  
Duty Cycle ◽  
Process Intensification ◽  
Agitation Speed ◽  
Molar Ratio ◽  
Hexyl Acetate ◽  
Enzyme Loading ◽  
Ultrasound Assisted ◽  
Fruity Odor

AbstractThis present study focuses on ultrasound assisted process intensification of hexyl acetate synthesis via lipozyme RMIM catalysed transesterification of hexanol with triacetin by using hexane as a solvent. Hexyl acetate, an ester with fruity odor and significant green note is mostly used as flavor and fragrance material in various areas. Effect of various parameters on conversion of hexyl acetate such as molar ratio, enzyme loading, temperature, power, agitation speed and duty cycle was studied systematically. With the molar ratio of 1:1 of hexanol to triacetin with 4% enzyme loading (w/v), at agitation speed of 100 rpm with application of sonication at 60 W power and 70% duty cycle resulted in to 83% conversion at 50°C temperature in 4 h when compared with conventional method which requires 9 h for 68% conversion.

scholarly journals Optimized Conditions for Flavonoid Extraction from Pomelo Peel Byproducts under Enzyme- and Ultrasound-Assisted Extraction Using Response Surface Methodology

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Mai Nguyen Tram Anh ◽  
Pham Van Hung ◽  
Nguyen Thi Lan Phi
Keyword(s):  
Response Surface Methodology ◽  
Optimal Condition ◽  
Response Surface ◽  
Conventional Method ◽  
Extraction Methods ◽  
Enzyme Concentration ◽  
Total Phenolic ◽  
Ultrasound Assisted Extraction ◽  
Pomelo Peel ◽  
Ultrasound Assisted

Pomelo (Citrus maxima (Burm.) Merrill) peel, which has been considered as a byproduct, is a potential source of flavonoids. In this study, the extraction conditions of total flavonoids from peels of Da Xanh pomelo were optimized using the response surface methodology with the Box–Behnken design. The combination of two novel extraction methods, including enzyme-assisted and ultrasound-assisted extractions, was used for the optimization. The results indicated that the optimal extraction condition was a liquid-to-solid ratio of 142.99 mL/g, enzyme concentration of 3.45%, and the time of 65.23 min for incubation and of 69.26 min for sonication treatment. Total phenolic and total flavonoid contents of the pomelo peel extracts, under optimal condition of the combined method (16.79 mg GAE/g and 10.69 mg RE/g, respectively), were significantly higher than those of the conventional method (6.58 mg GAE/g and 2.42 mg RE/g, respectively). The naringin and hesperidin contents of extracts under optimal condition increased by 5.70% and 1.20%, respectively, compared to the extracts under the conventional method.

scholarly journals Optimization of Aqueous Extraction Conditions of Inulin from the Arctium lappa L. Roots Using Ultrasonic Irradiation Frequency

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Farzaneh Esmaeili ◽  
Mahnaz Hashemiravan ◽  
Mohammad Reza Eshaghi ◽  
Hassan Gandomi
Keyword(s):  
Phenolic Compounds ◽  
Conventional Method ◽  
High Efficiency ◽  
Second Phase ◽  
Solvent Ratio ◽  
Sonication Time ◽  
Ultrasound Assisted Extraction ◽  
Arctium Lappa ◽  
Assisted Extraction ◽  
Ultrasound Assisted

Ultrasound-assisted extraction is a promising technique to obtain active compounds from plants with high efficiency. The present study was conducted in two sections. In the first phase, the effect of solvent type (methanol, ethanol, water, and water-ethanol (50 : 50, v/v)) on inulin extraction yield from burdock roots (Arctium lappa L.) was investigated by the conventional method. The second phase aim was to optimize the condition of inulin and phenolic compounds including sonication time (10–40 min), sonication temperature (40–70°C), and solid/solvent ratio (1 : 20–1:40 g/ml) using response surface methodology (RSM). The results demonstrated that the highest inulin efficiency was extracted by water in the conventional method, which is equal to 10.32%. The optimum conditions of ultrasound-assisted water extraction for independent variables including sonication time and temperature as well as solid/water ratio were 36.65 min, 55.48°C, and 1 : 35 g/ml, respectively, which were determined on the maximization of inulin and total phenol content and minimization of IC50. At this optimum condition, inulin yield, phenolic compounds, and IC50 were found to be 12.46%, 18.85 mg GA/g DW, and 549.85 µg/ml, respectively. Regarding the results of this research, ultrasound-assisted extraction can be used as an alternative to the conventional extraction methods in extracting bioactive compounds from medicinal plants because it may improve the mass transfer, reducing the extraction time and the solvent used.

Innovative Extraction Techniques for the Optimum Extraction of Phenolic Compounds from Peanut Meal and Evaluation of Their Biological Activities

2019 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Phenolic Compounds ◽  
Carcinoma Cell ◽  
Biological Activities ◽  
Peanut Meal ◽  
Ultrasound Assisted Extraction ◽  
Carcinoma Cell Lines ◽  
Assisted Extraction ◽  
Phenolic Extract ◽  
Ultrasound Assisted ◽  
Water Ratio

There is a worldwide demand for phenolic compounds (PC) because they exhibit several biological activities. This work aimed at extracting phenolic compounds from peanut meal. The methods of extraction were mainly: conventional solvent extraction (traditional methods) and ultrasound assisted extraction (recent methods) and comparing their results. Peanut meal (PM) was prepared by defatting with n-hexane, and then extracted by the two previous methods. First, the conventional solvents used were 80% methanol, ethanol, acetone, isopropanol, and distilled water. Then studied Different parameters such as meal: water ratio, also the effect of temperature and the pH on the extraction process. Second, ultrasonic assisted extractions (USAE), the parameters investigated were temperature, time and speed of sonication. Finally, all the extracts were analyzed by HPLC for their phenolic contents. Results indicated that the highest extracted PC achieved by solvents was in distilled water where 1:100, Meal: Water ratio which extracted 40 mg PC / g PM at 30& 35°C. Highest extracted PC was achieved by alkaline medium at pH 12 more than acidic and neutral medium. While (USAE) at speed 8 ultrasonication and temperature 30ᵒC, extracted 49.2mg PC /g PM. Sothe ultrasound assisted extraction exhibited great influence on the extraction of phenolic compounds from peanut meal. The ultrasonic peanut extract was examined for its antioxidant, antimicrobial and anticarcinogenic activities. The antioxidant activity of PM phenolic extract prepared by ultrasonic technique, was measured by, β-carotene, and DPPH methods, and reducing antioxidant power. Results revealed values: 84.57, 57.72 and 5960 respectively. The PM extract showed different levels of antimicrobial activity against the pathogenic bacteria used. As for the anticarcinogenic effect PM phenolic extract most effective on inhibiting colon carcinoma and lung carcinoma cell lines with IC50 = 20.7 and 20.8 µ/ml., respectively. This was followed by intestinal carcinoma and liver carcinoma cell lines with IC50= 39.6 and 40.2µ/ml.

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