• Title, Summary, Keyword: Microwave extraction

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Extraction of pesticide residues in medical herbs by microwave (Microwave를 이용한 한약재 중의 잔류농약 추출)

  • Kim, Taek-Kyum;Kim, Tang-Eok
    • The Korean Journal of Pesticide Science
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    • v.4 no.3
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    • pp.60-67
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    • 2000
  • This study was conducted to elucidate extraction efficiency by microwave in comparison with Soxhlet for extraction of pesticide residues in dried medical herbs; red-ginseng, white-ginseng, Bupleuri Radix, Angelica gigas Nakai, Rehmannia glutinosa. The acetone extraction by microwave of tolclofos-methyl and quintozene in medical herbs was efficient. The extraction efficiency by microwave with power 45 to 150 watts, extraction time 1 to 5 minutes and solvent volume 30 ml was compared with that of Soxhlet with extraction time 7 hours and solvent volume 150 ml. The extraction efficiency by microwave with extraction time 3 to 5 minutes was similar with extraction time of 7 hours by Soxhlet. When medical herbs spiked with tolclofos-methyl and quintozene was analyzed to how the extraction efficiency of microwave by kind of medical herbs, the extraction efficiency by microwave with extraction time of 3 to 5 minutes was the same as Soxhlet extraction. The optimal condition for extraction of tolclofos-methyl and quintozene in medical herbs by microwave was 45 to 90 watts of power supply, 3 to 5 minutes of extraction time and acetone 30 ml of solvent volume.

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Prediction of Optimal Microwave Extraction Conditions for Functional Compounds from Agrimonia pilosa Ledeb Using Response Surface Methodology (반응표면분석법을 이용한 용아초 기능성 성분의 마이크로웨이브 최적 추출조건 예측)

  • Park, Jong Jin;Lee, Won Young
    • Korean Journal of Medicinal Crop Science
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    • v.24 no.4
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    • pp.263-270
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    • 2016
  • Background: In this study, microwave extraction was used, which is an effective method to extract useful bioactive substances as it requires low quantities of solvent and short time periods. The aim of this study was to determine the optimal extraction conditions for Agrimonia pilosa Ledeb. Methods and Results: The independent variables were ethanol concentration, microwave power, and extraction time, each of which had five levels. The dependent variables were total polyphenol and total flavonoid content, and DPPH radical scavenging activity. To determine the optimal extraction conditions for bioactive compounds, a response surface methodology was employed. Contour maps were generated from polynomial equations. The optimal conditions were then assumed by superimposing these contour maps. Based on the resulting graph, the optimal microwave extraction conditions for Agrimonia pilosa Ledeb were determined as 42 - 48% ethanol concentration, 240 - 280W microwave power, and 13 - 20 min of extraction time. Conclusions: Ethanol concentration had a significant effect on microwave extraction, in terms of total polyphenol and total flavonoid content, as well as DPPH radical scavenging activity. Microwave power and extraction time influenced the total polyphenol content, but not the total flavonoid content or the DPPH radical scavenging activity.

Optimization of Pre-Treatment Conditions for Hydrocarbons Detection from Irradiated Soybean Using Microwave-Assiated Extraction (마이크로파 추출법을 이용한 방사선 조사 대두의 Hydrocarbons 분석 전처리조건 최적화)

  • Lee, Jeong-Eun;Kwon, Joong-Ho
    • Journal of the Korean Applied Science and Technology
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    • v.30 no.4
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    • pp.612-621
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    • 2013
  • Microwave-assisted extraction (MAE), which is known as less time and less solvent than current extraction methods, was applied to hydrocarbons extraction from irradiated soybean. Among the transported agricultural products, soybean was selected as representative samples for possible application of irradiated treatment and identification of radiation-induced markers. Using 4 kGy-irradiated soybean, different microwave extraction conditions (extraction time and microwave power) were applied and the changes in hydrocarbon concentrations were monitored. The predicted optimum extracted condition for hydrocarbon analysis of soybean was found to be microwave extraction with a microwave power of 97 W and extraction time of 2.2 min. This extraction time was significantly lower compared to the common extraction time of 12-24hr.

Changes of Total Polyphenol Content and Antioxidant Activity of Ligularia fischeri Extracts with Different Microwave-Assisted Extraction Conditions (마이크로웨이브 추출조건에 따른 곰취 추출물의 총 폴리페놀 함량 및 항산화작용의 변화)

  • 권영주;김공환;김현구
    • Korean Journal of Food Preservation
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    • v.9 no.3
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    • pp.332-337
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    • 2002
  • This study was undertaken in order to compare reflux extraction(RE) and microwave-assisted extraction(MAE) in extraction efficiency and establish optimum microwave extraction conditions in obtaining Ligularia fischeri extracts. A considerable reduction in extraction time was accomplished by MAE. When 70% methanol 50% methanol 70% ethanol, or 50% ethanol was used, MAE extract contained equal levels of soluble solid and total polyphenol as obtained by RE. The optimum microwave-assisted extraction conditions for Ligularia fischeri were achieved by 120∼150 watts of microwave energy and 4∼8 minutes of extraction time. No significant changes were found in antioxidant activity with DPPH scavenging method over the variation of microwave energy or extraction time. The use of diluted methanol or ethanol improved soluble solid content(30%), total polyphenol content(2.7%) and antioxidant activity(68%).

Changes of Total Polyphenol Content and Antioxidant Activity of Aster scaber Thunb Extracts with Different Microwave-Assisted Extraction Conditions (마이크로웨이브 추출조건에 따른 참취 추출물의 총 폴리페놀 함량 및 항산화작용의 변화)

  • 김현구;권영주;김영언;남궁배
    • Korean Journal of Food Preservation
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    • v.11 no.1
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    • pp.88-93
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    • 2004
  • This study was conducted in order to compare reflux extraction(RE) and microwave-assisted extraction(MAE) in extraction efficiency and establish optimum microwave extraction conditions in obtaining Aster scaber Thunb extracts. Extraction time was reduced considerably in MAE. When 70% methanol, 50% methanol, 70% ethanol, or 50% ethanol was used, no difference was found in the amount of soluble solid and total phenol between MAE and RE. The optimum microwave-assisted extraction conditions for Aster scaber Thunb were achieved by 120-150 watts of microwave energy and 4∼8 minutes of extraction time. No significant changes were found in antioxidant activity using DPPH scavenging method over the variation of microwave power or extraction time. The use of diluted methanol or ethanol improved soluble solid content(30.8%), total polyphenol content(2.9%) and antioxidant activity(69% ).

Development of the Sample Pretreatment Technique using Microwave for Analysis of Insecticide Imidacloprid Residues (마이크로파를 이용한 잔류 살충제 Imidacloprid 분석용 시료전처리 기술개발)

  • Ahn, S.Y.;Cho, H.K.;Lee, E.Y.
    • Journal of Biosystems Engineering
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    • v.32 no.2
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    • pp.121-129
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    • 2007
  • This study was conducted to elucidate extraction efficiency by microwave technique in comparison with sonication technique for extraction of insecticide residue in pear. In the analysis of the extraction efficiency of microwave for a pear spiked with imidacloprid, the extraction efficiency by microwave power of 300 W with extraction temperature of $80^{\circ}C$, heating time of 1 to 3 minute was shown to be similar with the extraction time 20 minutes by sonication. The optimal condition. in consideration of economical condition and treatment time, for microwave extraction of imidacloprid in the pear were 300 watts of power supply, $100^{\circ}C$ of extraction temperature, 1 minute of heating time and 10 mL of acetone volume. A new microwave vessel was developed to rapidly process the sample of the insecticide imidacloprid residues in the pear. This vessel was designed to include a reaction chamber and a filtration equipment, and a gathering chamber. The system could curtail a pretreatment time to 21 minutes than sonication and 7.9 minutes than the previous microwave vessel.

Preliminary Study: Comparison of Kinetic Models of Oil Extraction from Vetiver (Vetiveria Zizanioides) by Microwave Hydrodistillation

  • Kusuma, Heri Septya;Rohadi, Taufik Imam;Daniswara, Edwin Fatah;Altway, Ali;Mahfud, Mahfud
    • Korean Chemical Engineering Research
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    • v.55 no.4
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    • pp.574-577
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    • 2017
  • In Indonesia, vetiver oil is one commodity that plays an important role in the country's foreign exchange earnings. Currently, the extraction of essential oil from vetiver still uses conventional methods. Therefore, the aim of this study was to know and verify the kinetics and mechanism of microwave hydrodistillation of vetiver based on two models. In this study, microwave hydrodistillation was used to extract essential oils from vetiver. The extraction was carried out in nine extraction cycles of 20 min to 3 hours. The rate constant, the equilibrium extraction capacity, and the initial extraction rate were calculated using the two models. Kinetics of oil extraction from vetiver by microwave hydrodistillation proved that the extraction process was based on the second-order extraction model. The second-order model was satisfactorily applied, with high coefficients of correlation ($R^2=0.9427$), showing that it well described the process.

Extraction Yields and Functional Properties of Garlic Extracts by Response Surface Methodology

  • Lim, Tae-Soo;Do, Jeong-Ryong;Kwon, Joong-Ho;Kim, Hyun-Ku
    • Food Science and Biotechnology
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    • v.17 no.2
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    • pp.379-383
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    • 2008
  • Extraction characteristics of garlic and functional properties of corresponding extract were monitored by response surface methodology (RSM). Maximum extraction yield of 26.41% was obtained at microwave power of 146.29 W, ethanol concentration of 63.31 %, and extraction time of 5.88 min. At microwave power, ethanol concentration, and extraction time of 114.84 W, 58.83%, and 1.42 min, respectively, maximum electron-donating ability (EDA) was 72.86%. Maximum nitrite-scavenging ability was 94.62% at microwave power, ethanol concentration, and extraction time of 81.83 W, 2.65%, and 3.83 min, respectively. Superoxide dismutase (SOD) showed maximum pseudo-activity of 49.12% at microwave power of 34.23 W, ethanol concentration of 33.11 %, and extraction time of 4.40 min. Based on superimposition of 4-dimensional RSM with respect to extraction yield, electron-donating ability, nitrite-scavenging ability, and pseudo-activity of SOD, optimum ranges of extraction conditions were microwave power of 0-100 W, ethanol concentration of 40-70%, and extraction time of 2-8 min.

A Preliminary Study of Patchouli Oil Extraction by Microwave Air-Hydrodistillation Method

  • Kusuma, Heri Septya;Altway, Ali;Mahfud, Mahfud
    • Korean Chemical Engineering Research
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    • v.55 no.4
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    • pp.510-513
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    • 2017
  • Patchouli oil extraction in general is still using conventional methods that require a long time of extraction. It is therefore necessary to develop extraction methods to obtain patchouli oil with optimum yield and quality. One of the new methods, which has been successfully developed, is microwave hydrodistillation (MHD). In addition to optimizing the extraction process of patchouli oil, this study also used microwave air-hydrodistillation (MAHD). Based on the research results, extraction using MAHD method can produce higher yield of patchouli oil when compared using MHD method. Also, based on the results of the analysis by GC-MS, extraction using MAHD method can produce quality of patchouli oil that is almost the same when compared using MHD method. This is supported by the results of the analysis by GC-MS, which showed that the content of patchouli alcohol is the main component of patchouli oil, and is almost the same for patchouli oil extracted using MHD method (26.32%) and MAHD method (25.23%).

Microwave-assisted extraction of paclitaxel from plant cell cultures (Microwave를 이용한 식물세포배양으로부터 paclitaxel 추출)

  • Hyun, Jung-Eun;Kim, Jin-Hyun
    • KSBB Journal
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    • v.23 no.4
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    • pp.281-284
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    • 2008
  • A simple and efficient microwave-assisted extraction procedure was developed and optimized for the extraction of paclitaxel from the plant cell cultures of Taxus chinensis. The biomass, immersed in a methanol-water mixture, was irradiated with microwaves in a closed-vessel system. The microwave-assisted extraction was compared with the existing conventional solvent extraction in terms of yield, extraction time, and solvent consumption. The use of microwave energy allows rapid recovery of paclitaxel from biomass and dramatically reduces extraction time and solvent usage compared to conventional solvent extraction. The paclitaxel was completely extracted from biomass by microwave-assisted extraction for 3 min at $50^{\circ}C$, for 6 min at $30^{\circ}C$ and $40^{\circ}C$, respectively.