• Title, Summary, Keyword: extraction

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Optimal Organic Solvent Extraction Method for Dewaxing of Beeswax-treated Hanji (밀랍도포한지의 탈랍을 위한 최적 유기용매 추출기법 탐색)

  • Choi, Do-Chim;Choi, Eun-Yeon;Jo, Byoung-Muk;Cho, Byoung-Uk
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.44 no.6
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    • pp.50-57
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    • 2012
  • In this study, the beeswax extraction methods using organic solvents were examined to develop a optimal dewaxing technology for beeswax-treated Hanji. Thermally-aged beeswax-treated Hanji was dewaxed using four types of extraction methods including dipping, Soxhlet extraction, ultrasonic washing and shaking methods. Then, the aging stability of the dewaxed Hanji was evaluated in terms of variations in paper strength and in the color of the printed area with muk. The experimental results suggested that the dewaxing methods allowing solvent to flow during extraction showed superior extraction efficiency. The dipping method in which the organic solvent does not flow showed the slowest extraction rate of beeswax compared to three other methods. In terms of variations in tensile strength and folding endurance, however, no obvious differences in the aging stability were observed amongst these four extraction methods. Regarding the aging stability in terms of the color of the printed area with muk, Soxhlet extraction method showed the best performance of dewaxing.

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.

Heavy Metals Extraction from Contaminated Soils using Aqua Regia Extraction (왕수를 이용한 중금속 오염토양에서의 추출방안 연구)

  • Lee, Dukyoung;Jung, Sunkook;Son, Younggyu
    • Journal of Soil and Groundwater Environment
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    • v.23 no.2
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    • pp.15-22
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    • 2018
  • Aqua regia extraction for the quantification of heavy metals and As in contaminated soils was investigated as one of preliminary steps for on-site monitoring using sensor technology. Soil samples were taken from closed railway depot, closed mines, and closed refinery and various extraction conditions including $30^{\circ}C/15min$, $30^{\circ}C/30min$, $30^{\circ}C/60min$, $30^{\circ}C/120min$, $80^{\circ}C/15min$, $80^{\circ}C/30min$, $80^{\circ}C/60min$, $80^{\circ}C/120min$ were tested. The optimal extraction condition was determined as $80^{\circ}C/60min$ because the extraction efficiencies of Zn were relatively low and did not reach the targeted level (80-100% of original concentrations) for $30^{\circ}C$ conditions. It was found that the fractionation of heavy metals and As using the sequential extraction method was useful to understand the degree of metal extraction. In order to enhance the extraction efficiency within short extraction time, ultrasound technology using a 20 kHz horn-type sonicator was additionally used for $30^{\circ}C/15min$. It was revealed that ultrasound could significantly enhance the extraction efficiency and pulsed irradiation showed higher efficiency than continuous irradiation due to the less formation of bubble clouds. However high temperature condition ($80^{\circ}C$) was required to achieve high extraction efficiency for Zn in spite of the use of ultrasound.

Comparison of Static and Dynamic Solvent Extraction of Polychlorinated Dibenzofurans from Fly Ash

  • Yang, Jeong Soo;Jeong, Jang Hwan;Yu, Euy Kyung
    • Analytical Science and Technology
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    • v.17 no.4
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    • pp.295-301
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    • 2004
  • In this study, static and dynamic solvent extractions are compared for more efficient extraction of polychlorinated dibenzofurans (PCDFs) from fly ash. Static solvent extraction rather than dynamic extraction showed a higher recovery of PCDFs, which was adsorbed strongly with fly ash. The effects of parameters, such as temperature, toluene-isopropyl alcohol mixture, static and dynamic time flow rate, and solvent volume on the extraction were investigated and the variations in average recoveries of PCDFs were explained. In both extractions, temperature was an effective parameter because the higher temperature gave the higher recoveries. In dynamic solvent extraction, dynamic time was more effective than flow rate and solvent volume for the extraction of PCDFs from fly ash. Multi-layer column chromatography on neutral and acidic silica gel with n-hexane was used for cleaning up the extracts. The quantification of the PCDFs extracted was performed using HPLC-UV.

A Direction-Based Vascular Pattern Extraction Algorithm for Hand Vascular Pattern Verification

  • Im, Sang-Kyun;Choi, Hwan-Soo;Kim, Soo-Won
    • ETRI Journal
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    • v.25 no.2
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    • pp.101-108
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    • 2003
  • This paper proposes an improved vascular pattern extraction algorithm for person verification applications. The proposed direction-based vascular pattern extraction (DBVPE) algorithm is based on the directional information of vascular patterns. It applies two different filters to the input images: row vascular pattern extraction filter (RVPEF) for effective extraction of the abscissa vascular patterns and column vascular pattern extraction filter (CVPEF) for effective extraction of the ordinate vascular patterns. We use the combined output of both filters to obtain the final hand vascular patterns. Unlike the conventional hand vascular pattern extraction algorithm, the directional extraction approach prevents loss of the vascular pattern connectivity. To validate the DBVPE algorithm, we used a prototype system with a DSP processor. The prototype system shows approximately a three-times better false acceptance rate (FAR) than the conventional single filter algorithm.

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Optimization of Extraction of Astaxanthin from Portunus trituberculatus by Ionic Liquids (이온성 액체를 사용한 꽃게 껍질에서 아스타크산틴 추출 조건의 최적화)

  • Lee, Yu Jin;Lee, Yu Ri;Tang, Baokun;Row, Kyung Ho
    • KSBB Journal
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    • v.28 no.4
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    • pp.238-243
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    • 2013
  • Astaxanthin is one of the carotenoid with strong antioxidant. The conditions of extraction of astaxanthin from Portunus trituberculatus were optimized in this work. Six factors of conditions such as, extraction method, extraction solvent, ratio of solvent to raw material, temperature, and time, were investigated. For the increase of the extraction yield, ionic liquids were used as additives in the extraction solvent. The optimum extraction conditions were found: heat reflux extraction, Dichloromethane/methanol (25:75, v/v) as solvent, 1:30 of the ratio of solvent raw material, $80^{\circ}C$, 90 min, and ionic liquid as additive. As a result, 45.81 ${\mu}g/g$ of astaxanthin was extracted from waste.

Comparison of Extraction Methods for Aglycone isoflavones from Korean Soybean (토종콩에 포함된 비배당체 이소플라본의 추출 방법 비교)

  • Lee Kwang Jin;Row Kyung Ho
    • KSBB Journal
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    • v.19 no.6
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    • pp.421-426
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    • 2004
  • The extraction and separation of isoflavones from Korean soybean were peformed by various mechanical and chemical extraction methods. They included solvent extraction, stirring, supersonification and sub/supercritical water extraction. From the experimental results of the variation of solvent extraction by change in composition, the increase in extraction of a specific compound by stirring or supersonic energy, and the application of supercritical fluid with superior solvating power over solvents, the sonification was the most desirable extraction method in extracting aglycone isoflavones, daidzein and genistein from Korean soybean.

Extraction and Degradation of Alginate from Brown Seaweed Stem Using Microorganism (미생물을 이용한 미역줄기에서 알긴산염 추출 및 저분자화)

  • Ahn Seong-Jun;Kim Young-Sook;Park Kwon-Pil
    • Journal of Environmental Science International
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    • v.13 no.12
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    • pp.1139-1144
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    • 2004
  • We studied a extraction and degradation of alginate from seaweed-stems using microorganism DS-02. DS-02 has a maximum growth rate at $30^{\circ}C$ and the enzyme has a maximum activity of alginate extraction at $35^{\circ}C.$ The yield of alginate extraction using DS-02 is about $16.0{\%}$ for 3.0 hour and molecular weight of the alginate decreased to about 1/8 of initial value after 24 hour extraction. Alginate extraction method by DS-02, compared with general alkali-extraction method, has an advantage of decreasing the molecular weight of alginate during extraction.

Extraction of Phenol from the Contaminated Soil Using Microwave Energy (Microwave Energy를 이용한 오염토양에서 Phenol의 추출)

  • 이기환;이태호;김윤아
    • Journal of Environmental Science International
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    • v.12 no.4
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    • pp.447-459
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    • 2003
  • This study was carried out to develop an efficient process far the elimination of phenol pollutant from soils. An microwave-assisted process (MAP) and a conventional Soxhlet extraction method (SEM) were employed to extract phenol from two types of soils. The effects of extraction methods, aged time of the spiked soil samples, extraction solvent and extraction time on the extraction performance were compared. Our results demonstrate that the recoveries from standard soil spiked were at least 10% higher fer MAP than these f3r the conventional Soxhlet. The extraction time by MAP requires significantly shelter time (1 min) than 15 h of the conventional Soxhlet. The recoveries from non-contaminated soil spiked with phenol were also almost identical f3r above results. The reduction of the extraction times with efficiency higher than that afforded by the conventional Soxhlet technique supports the suitability of the MAP method.

Simultaneous Extraction and Separation of Oil and Azadirachtin from Seeds and Leaves of Azadirachta indica using Binary Solvent Extraction

  • Subramanian, Sheela;Salleh, Aiza Syuhaniz;Bachmann, Robert Thomas;Hossain, Md. Sohrab
    • Natural Product Sciences
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    • v.25 no.2
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    • pp.150-156
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    • 2019
  • Conventional extraction of oil and azadirachtin, a botanical insecticide, from Azadirachta indica involves defatting the seeds and leaves using hexane followed by azadirachtin extraction with a polar solvent. In order to simplify the process while maintaining the yield we explored a binary extraction approach using Soxhlet extraction device and hexane and ethanol as non-polar and polar solvents at various ratios and extraction times. The highest oil and azadirachtin yields were obtained at 6 h extraction time using a 50:50 solvent mixture for both neem leaves (44.7 wt%, $720mg_{Aza}/kg_{leaves}$) and seeds (53.5 wt%, $1045mg_{Aza}/kg_{leaves}$), respectively.