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.

scholarly journals CENTRAL COMPOSITE DESIGN FOR OPTIMIZING EXTRACTION OF EGCG FROM GREEN TEA LEAF (CAMELLIA SINENSIS L.)

2018 ◽  
Vol 10 (6) ◽  
pp. 211
Author(s):  
Eka Indra Setyawan ◽  
Erna Prawita Setyowati ◽  
Abdul Rohman ◽  
Akhmad Kharis Nugroho
Keyword(s):  
Water Temperature ◽  
Green Tea ◽  
Epigallocatechin Gallate ◽  
Extraction Yield ◽  
Hot Water ◽  
Extraction Condition ◽  
Optimum Extraction ◽  
Central Composite ◽  
Brewing Time ◽  
Optimum Extraction Condition

Objective: This study was intended to optimize the extraction condition using central composite design.Methods: Central composite cesign with three independent variables, namely water temperature, brewing time, and brewing number were used to obtain the optimum extraction condition. Two dependent variables, namely yield of extraction and epigallocatechingallate level were used as a response parameter. Epigallocatechin gallate level was determined by using high-performance liquid chromatography method.Results: Extraction yield was varied from 0.30 g to 0.72 g. All variables, namely water temperature, brewing time, and brewing number were able to increase the extraction yield. Epigallocatechingallate level was varied from 190.23 mg/g to 301.74 mg/g. Water temperature, brewing time, and both interaction were able to increase the epigallocatechin gallate level in green tea extract.Conclusion: Optimum extraction condition was shown using hot water at a temperature of 95 °C for 20 min and two-times infusions. The condition obtained extraction yield and epigallocatechingallate of 0.70 g and 286.87 mg/g dry weight, respectively.

A New Process of Extracting Oleoresin Ginger from Ginger by Critical-State Liquid CO2

2013 ◽  
Vol 699 ◽  
pp. 212-216 ◽  
Author(s):  
Yong Qing Tao ◽  
Yang Shi ◽  
Si Min Zhang ◽  
Xi Yao Dong ◽  
Pan Pan Gao ◽  
...  
Keyword(s):  
Critical State ◽  
Liquid State ◽  
Extraction Efficiency ◽  
Low Cost ◽  
Co2 Flux ◽  
Extraction Yield ◽  
Extraction Temperature ◽  
Supercritical State ◽  
Optimal Parameters ◽  
New Process

We developed a new procession of extraction efficiency of ginger oleoresin by comparing the CO2 flux in liquid state with that in supercritical state under variant pressure conditions. In our this report, we found that the optimal parameters of this procession: 9～10MPa in extraction pressure, 10～20°C in extraction temperature, 8～10MPa in isolation pressure, and 35～45°C in isolation temperature. This procession is steady and ensures both the extraction yield of ginger oleoresin and the low cost of operation.

scholarly journals Optymalizacja parametrów technologicznych filtra z granulowanym złożem polistyrenowym do uzdatniania wody kotłowej (studium przypadku)

2019 ◽  
Vol 28 (3) ◽  
pp. 476-487
Author(s):  
Yuliya Trach ◽  
Piotr Wichowski
Keyword(s):  
Water Cycle ◽  
Hot Water ◽  
Optimal Parameters ◽  
Technological Parameters ◽  
Boiler Water ◽  
Oxidized Iron ◽  
Pre Treatment ◽  
Pollution Removal ◽  
Filter Bed ◽  
Kinetics Of

The article presents research to determine the optimal technological parameters of the hot water pre-treatment filter for the analyzed boiler water cycle. For the analyzed case, the optimal parameters are: the grain size of the polystyrene bed d = 1.25 mm, the filtration speed V = 7.0 m·h–1, the height of the filtration layer H = 1.2 m. The use of a polystyrene filter bed allows obtaining comparable efficiency of water treatment in relation to the traditionally used quartz sand. Analysis of the kinetics of pollution removal showed that during filtration of water through the polystyrene bed in the direction from the bottom up there are two zones: the lower zone is dominated by the process of mechanical deposition of oxidized iron, the upper by reduction of the COD concentration.

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.

scholarly journals Economic assessment and optimizing of the solar water heating system

2018 ◽  
Vol 210 ◽  
pp. 02023
Author(s):  
Jan Skovajsa ◽  
Martin Zálešák
Keyword(s):  
Solar System ◽  
Optimal Solution ◽  
Heating System ◽  
Hot Water ◽  
Design Parameters ◽  
Optimal Parameters ◽  
Water Heating ◽  
Solar Water Heating ◽  
Solar Water ◽  
Solar Water Heating System

The article deals with the economic evaluation of investment and optimization of the solar water heating system for family houses. From the point of view of solar systems, the optimal solution is based on the specific application of it. The design is dependent on the location of solar thermal collectors and ration between active aperture area and real daytime consumption. Common calculations according to actual standards often give overstated results, which also reflected in the value of the investments. The article presents the research of optimal parameters of the thermal solar system for preparing of domestic hot water. A combination of related standards and software TRNSYS are used to find optimal parameters. Thanks to created and verified simulation models, it is possible to design parameters so as to avoid under-dimensioning or over-dimensioning of the solar system. Energy price is another factor affects the payback period of investments. This is affected by the used energy sources and their combination. For example, buildings that use electricity to heat water or heating have different energy charges than a building that uses natural gas. So, the aim is to find technically and economically efficient solution.

scholarly journals Optimization of Waste Cooking Oil’s FFA as Biodiesel Feedstock

Teknomekanik ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 14-21
Author(s):  
Sri Rizki Putri Primandari ◽  
Andril Arafat ◽  
Harumi Veny
Keyword(s):  
Irradiation Time ◽  
Control Variable ◽  
Waste Cooking Oil ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Cooking Oil ◽  
Biodiesel Feedstock ◽  
Temperature Irradiation ◽  
Acid Esterification ◽  
Central Composite

Waste cooking oil has high Free Fatty Acid (FFA). It affected on decreasing a biodiesel production. FFA reduction is one of important processes in biodiesel production from waste cooking oil. Thus, this study aimed to examine the optimum condition in FFA reduction. The process is assisted by using ultrasonic irradiation on acid esterification. Variables of the process are acid concentration, molar ratio of methanol and oil, and irradiation time. Meanwhile temperature irradiation on 45oC is a control variable. Process optimization is conducted by Response Surface Methodology (RSM) with Central Composite Design (CCD). The optimum conditions of response were 7.22:1 (methanol to oil molar ratio), 0.92% wt H2SO4, 26.04 minutes (irradiation time), and 45oC (irradiation temperature). Ultrasonic system reduced FFA significantly compared to conventional method.

scholarly journals Development and application of green and sustainable analytical methods for flavonoid extraction from Passiflora waste

BMC Chemistry ◽  
2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Danielle da Silva Francischini ◽  
Ana Paula Lopes ◽  
Mateus Lodi Segatto ◽  
Aylon Matheus Stahl ◽  
Vânia Gomes Zuin
Keyword(s):  
Large Scale ◽  
Extraction Yield ◽  
Passion Fruit ◽  
Optimal Parameters ◽  
Passiflora Edulis ◽  
Processing Plants ◽  
Green Separation ◽  
Solid Liquid ◽  
Full Factorial ◽  
Brazilian Biodiversity

Abstract Brazilian biodiversity and favourable environmental conditions open up possibilities not yet explored, showing potential to shift the country’s monochromatic economy into an emancipated, diversified and sustainable economic environment. This can be made possible through the integral use of its resources, exploring every functional fraction to create novel solutions to modern problems. Biorefineries present an interesting strategy to fully use the potential of agricultural feedstocks and together with green separation methods can contribute to the generation of sustainable processes and products. Passion Fruit (Passiflora edulis Sims f. flavicarpa Deg species) is produced on a large scale in Brazil and in other tropical countries, and its processing plants generate tons of residues that basically consist of peel, seeds and bagasse, which account for around 75% of its mass. These fractions of P. edulis can contain significant amounts of flavonoids, secondary metabolites that are the main compounds responsible for the fruit’s bioactivity (antioxidant, anti-inflammatory, pesticide and biocide, in general). Therefore, this work aims to develop, apply and compare the best conditions for the extraction of isoorientin, orientin and isovitexin from passion fruit applying solid–liquid methodologies, followed by analyte quantification using UHPLC-PDA. Homogenizer-assisted (HAE), ultrasound-assisted (UAE) and microwave-assisted (MAE) extraction techniques were used, as well as a full factorial design to reach optimal parameters concerning the extraction yield and energy and solvent efficiencies. According to the results, the procedure based on HAE presented the best conditions for the extraction of selected flavonoids (1.07, 0.90 and 0.33 mg g−1 of isoorientin, orientin and isovitexin, respectively) and was considered the best method according to the green and sustainable described factors.

Investigation of the Effects of Technological Parameters on Surface Roughness in Extrusion Bars of Aluminum Alloy

2019 ◽  
Vol 889 ◽  
pp. 155-160
Author(s):  
Trong Mai Nguyen ◽  
Đuc Quy Tran ◽  
Van Nghe Pham ◽  
Van Canh Nguyen
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Surface Quality ◽  
Research Work ◽  
Extrusion Process ◽  
Optimal Parameters ◽  
Technological Parameters

In this research work, the result of the effects of technological parameters on surface roughness in extrusion bars of aluminum alloy were pesented. The results of this study may be used for choosing optimal parameters of extrusion process so that surface quality of extruded bar was improved.

scholarly journals Green and Efficient Extraction of Polysaccharides From Poria cocos F.A. Wolf by Deep Eutectic Solvent

2020 ◽  
Vol 15 (2) ◽  
pp. 1934578X1990070 ◽  
Author(s):  
Weida Zhang ◽  
Shaobo Cheng ◽  
Xiaona Zhai ◽  
Junshe Sun ◽  
Xuefang Hu ◽  
...  
Keyword(s):  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Extraction Yield ◽  
Hot Water ◽  
Poria Cocos ◽  
Extraction Solvent ◽  
Molecular Weight Distributions ◽  
Efficient Extraction ◽  
Run Test

Deep eutectic solvents (DESs) were proposed for the extraction of polysaccharides from Poria cocos (PCPs). Six types of DESs were prepared, and the DES composed of choline chloride and oxalic acid was proved to be suitable. Based on the results of single-factor test, the Box-Behnken experimental design with response surface methodology was carried out, giving the optimal extraction conditions including mole ratio of 1:2 (choline chloride:oxalic acid) and extraction 15 minutes at 100°C. Under the optimal extraction conditions, the extraction yield (46.24% ± 0.13%) was 8.6 times higher than that of hot water. The reusability of DES was demonstrated by a 6-run test, and an extraction yield of PCP was 38.40% ± 0.23% after reusing for 6 times without adding any additional chemicals. Moreover, molecular weight distributions of the resulting PCP were analyzed, and then mainly distributed in the range of 753 to 3578 g/mol. Therefore, DESs were proved to be an excellent extraction solvent alternative to the extraction of PCP.

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