• 제목/요약/키워드: Oleate

검색결과 115건 처리시간 0.024초

Colloidal Synthesis of Octahedral Shaped PbSe Nanocrystals from Lead Oleate and Se : Temperature Effect

  • Gokarna, Anisha;Jun, Ki-Won;Khanna, P.K.;Baeg, Jin-Ook;Seok, Sang-Il
    • Bulletin of the Korean Chemical Society
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    • 제26권11호
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    • pp.1803-1806
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    • 2005
  • Formation of octahedral shaped PbSe quantum dots at higher synthesis temperature is being reported in this paper. The synthesis includes the reaction between lead oleate and trioctylphosphine selenide under inert gas conditions to produce PbSe. TEM, SEM, XRD and EDS were used to characterize the samples. The SEM exhibited the formation of spherical shaped nanocrystals at temperature below 140 ${^{\circ}C}$ and octahedral shaped nanoparticles at higher temperatures. Moreover, the TEM also showed the well resolved (111) lattice fringes proving that the nanocrystals were crystalline in nature. Synthesis of highly pure PbSe nanocrystals was another interesting aspect of this research.

On-off Dewatering Control for Lipase-catalyzed Synthesis of n-Butyl Oleate in n-Hexane by Tubular Type Pervaporation System

  • Kwon, Seok-Joon;Rhee, Joon-Shick
    • Journal of Microbiology and Biotechnology
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    • 제8권2호
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    • pp.165-170
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    • 1998
  • Lipase-catalyzed esterification of n-butyl oleate was carried out in n-hexane as a model reaction. The optimal activity of Candida rugosa lipase was shown in a water activity ($a_w$) range of 0.52 to 0.65 at $30^{\circ}C$. The water produced from the esterification was removed by a tubular type pervaporation system. The rate of ester formed from the enzymatic esterification was allowed to be the same as the rate of water removal by maintaining an optimal $a_w$ of the reaction system using an on-off dewatering control device. The reaction rate and yield with a$a_w$ control were increased two folds higher than the respective values for the uncontrolled reaction.

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Effect of Glycerophospholipid on Oleate-Dependent Phospholipase D in Mammalian Source

  • 김명주;김봉섭;이상윤;손정원;김철용;최명선;최명운
    • Bulletin of the Korean Chemical Society
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    • 제18권11호
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    • pp.1204-1207
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    • 1997
  • Effects of exogenous glycerophospholipids on oleate-dependent phospholipase D (PLD) activity were studied in lymphocytic mouse leukemia L1210 cells and in solubilized microsomal phospholipase D of rat brain. Among the phospholipids tested phosphatidic acid had the most stimulatory effects on both PLD activities up to about 3 folds. Lysophosphatidic acid also showed promoting effect on microsomal PLD activity but much less on L1210 cells compared to that of phosphatidic acid. While phosphatidylethanolamine increased PLD activity slightly, phosphatidylinositides were nearly ineffective in the tested sources. The stimulatory effect of phosphatidic acid observed can be utilized to improve the in vitro assay system for oleate-dependent PLD in mammalian sources.

Sclerotherapy of Multiple Intraoral Venous Malformations with Use of Ethanolamine Oleate: A Case Report (구강내 발생한 다발성 정맥기형 병소에의 Ethanolamine Oleate 경화제 주사 후 치험례)

  • Kim, Tae-Kwang;Yang, Jae-Young;Choi, Seok-Tai;Jeon, Hee-Kyung;Leem, Dae-Ho;Baek, Jin-A;Shin, Hyo-Keun;Ko, Seung-O
    • Maxillofacial Plastic and Reconstructive Surgery
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    • 제34권6호
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    • pp.488-493
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    • 2012
  • Hemangioma and vascular malformation are the most common benign tumors that are caused by congenitally or traumatic events. Theses tumors represent approximately 1/3~1/4 of all hemangiomas and vascular malformations in the head and neck. There are many forms of treatment for hemangioma and vascular malformation including closed observation, surgery, radiotherapy, laser therapy, steroid therapy, compression, embolization, and sclerotherapy. Ethanolamine oleate is an unsaturated fatty acid salt that has been used as a sclerosing agent because of its excellent thrombosing properties. This paper presents 1 case of intraoral multiple venous malformations treatment with 1.25% ethanolamine oleate (3.6~9.6 mg dose) intralesionally injected for 6 to 14 weeks over 2 week intervals. After the sclerotherapy, lesions almost completely disappeared without side effects. In conclusion, sclerotherapy using ethanolamine oleate is very effective against venous malformations, and sufficiently provides alternative support for surgical and other methods.

Development of Selectable Marker of High Oleate Trait in Peanut (Arachis hypogaea L.) (땅콩에서 고 올레인산 형질관련 분자마커의 선발)

  • Yang, Kiwoung;Pae, Suk-Bok;Park, Chang-Hwan;Lee, Myoung Hee;Jung, Chan-Sik;Son, Jeong-Hee;Park, Keum-Yong
    • Korean Journal of Breeding Science
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    • 제42권5호
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    • pp.507-514
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    • 2010
  • Peanut(Arachis hypogaea L.) is one of the major oilseed crops. The peanut oil consists of palmitic, oleic and linoleic acids, which are present at levels of 10%, 36-67% and 15-43%, respectively. High oleate mutant of peanut F435 contains 80% oleate and as little as 2% linoleate in seed oil. Previous study indicated that delta 12 fatty acid desaturase is a major enzyme controlling the oleate content in seeds of oilseed crops. F435 sequence alignment of their coding regions disclosed that an extra A(adenine) was inserted at the position +2,823 bp of delta 12 fatty acid desaturase gene. This study was to develop molecular marker (SNP marker) co-segregating with the high oleate trait. Chopyeong ${\times}$ F435 $F_2$ 41 population were investigated using molecular marker and fatty acid assay (NIR and gas chromatography). Finally, this marker segregates Chopyeong type 26 lines, heterotype 9 lines and F435 type 6 lines. These results in our study suggested that SNP marker conform fatty acid assay.

Effect of Monounsaturated Fatty Acid-enriched Peanut Consumption on Serum Lipid in High Fat Diet-induced Mice (고지방 식이 유도 비만 마우스에서 고올레산 땅콩 섭취의 혈장 지질 개선 효과)

  • Oh, Eunyoung;Pae, Suk-Bok;Kim, Sungup;Kim, Jung-In;Lee, Myoung Hee;Sung, Jung Sook;Ha, Tae Joung
    • The Korean Journal of Food And Nutrition
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    • 제33권6호
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    • pp.747-754
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    • 2020
  • This study was conducted to evaluate the effect of high-oleate and normal-oleate peanut consumption on adipose mass and serum lipids in obese-induced C57BL/6J mice. After four weeks of the high-fat diet, mice were randomly divided into six groups: normal control (NC) diet, high-fat control (HFC) diet, high-oleate peanut-seed (HOPS) diet, normal-oleate peanut-seed (NOPS) diet, high-oleate peanut-oil (HOPO) diet, and olive-oil (OO) diet. After four weeks, all four experimental diet groups showed significantly lower body weight and epididymal fat weight than HFC group. In four experimental diet groups, serum triglycerides (TG), total cholesterol (TC) and low-density lipoprotein cholesterol (LDL-C) were significantly lower, and high-density lipoprotein cholesterol (HDL-C) was significantly higher than HFC group. TG was significantly decreased in HOPS group (92.1±1.2 mg/dL) than NOPS group (101.7±5.3 mg/dL, p<0.05). Similarly, LDL-C was significantly lower in HOPS group (66.1±2.8 mg/dL) than NOPS (76.9±1.5 mg/dL, p<0.05), on the other hand, HDL-C indicated a significant elevation in HOPS (50.5±2.1 mg/dL) than NOPS group (45.2±1.6 mg/dL, p<0.05). This result suggests that the consumption of high-oleate peanut has a favorable effect on the plasma lipid profile.

Analytical Studies on the Lipids in Carotenoprotein purified form Saimo Salar Eggs (연어알에서 분리 정제한 carotenoprotein 지질 성분에 관한 연구)

  • 김재웅;이정복
    • The Korean Journal of Food And Nutrition
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    • 제1권2호
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    • pp.18-24
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    • 1988
  • 이온교환 크로마토그라피와 젤 여과법으로 연어알에서 carotenoprotein을 충분히 정제하였다. CHCls/MeOH (211)용매로 지질 성분을 추출한 후, Sephadex G-25로 정제하고 silicic acid 컬럼으로 분획하여 중성지질, 당지질, 인지질 그리고 콜레스테롤의 량을 각각 정량하였다. T.L.C.와 HPLC로 개별 성분을 분리, 정량한 결과 중성지질은 tripalmitate와 cholesteryl oleate로 구성되었고, 당지질은 esterified steryglycoside와 소량의 cerebroside, 인지질은 p.c, co, lp.c 및 p.e로 구성 되었음을 밝혔다. 결합당 성분으로서는 galactose만이 검출되었다. 지방산은 palmitate와 oleate가 대부분이었으며, 6종류의 sterol성분을 분리 확인하였다. 지질과 결합된 단백질의 아미노산도 분석하여 이들로부터 carotenoprotein의 본성을 추론하였다.

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Hot-Injection Thermolysis of Cobalt Antimony Nanoparticles with Co(II)-Oleate and Sb(III)-Oleate

  • Ahn, Jong-Pil;Kim, Min-Suk;Kim, Se-Hoon;Lee, Byung-Ha;Kim, Do-Kyung;Park, Joo-Seok
    • Journal of the Korean Ceramic Society
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    • 제53권3호
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    • pp.367-375
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    • 2016
  • A novel strategy for the synthesis of $CoSb_2$ nanoparticles is demonstrated via preparation of novel organometallic complexes. Hydrated cobalt oleate (CoOl) and non-hydrated antimony oleate (SbOl) complexes are synthesized as precursors. The $CoSb_2$ nanoparticles are prepared by hot injection, which involves thermolysis of CoOl and SbOl in a non-coordinating solvent at $320^{\circ}C$. The coordination modes and distinct thermal behaviors of the intermediate non-hydrated SbOl complexes are comparatively investigated by thermo-analytical techniques. When the reaction temperature is increased, the particle size is found to increase linearly. The crystallinity of the $CoSb_2$ nanoparticles prepared at $250^{\circ}C$ is amorphous phase without any peaks. $CoSb_2$ structural peaks start to appear at $300^{\circ}C$ and dominant peaks with high crystallinity are synthesized at $320^{\circ}C$. The potential chemical structures of non-hydrated SbOl and their reaction mechanisms by thermolysis are elucidated. The elemental composition and crystallographic structure of $CoSb_2$ nanoparticles suggest a bimodal interaction of the organic shell and the nanoparticle surface, with a chemical absorbed inner layer and physically absorbed outer layer of carboxylic acid.

Preparation of Magnetic Chitosan Microsphere Particles (나노 크기의 마그네타이트 입자를 이용한 자성 키토산 미소구체의 제조)

  • Ko, Sang-Gil;Cho, Jun-Hee;Ahn, Yang-Kyu;Song, Ki-Chang;Choi, Eun-Jung
    • Journal of the Korean Magnetics Society
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    • 제16권1호
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    • pp.66-70
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    • 2006
  • Magnetite nanoparticles, which have been extensively used in many fields, were encapsulated with a natural polymer, chitosan, to improve their biocompatibility. We have synthesized magnetite $(Fe_3C_4)$ nanoparticles using chemical coprecipitation technique with sodium oleate as surfactant. Nanoparticle size can be varied from 1.2 to 7.4nm by controlling the sodium oleate concentration. Magnetite phase nanoparticles could be observed from X-ray diffraction. Magnetic colloid suspensions containing particles with sodium oleate and chitosan have been prepared. High magnetic property chitosan-microsphere particles were prepared from oleate-coated magnetite suspension using spray method. The surftce, and tile morphology of the magnetic chitosan microsphere particles were characterized using optical microscope and scanning electron microscope. Magnetic hysteresis measurement were performed using a superconducting quantum interference device (SQUID) magnetometer at room temperature to investigate the magnetic properties of the chitosan microspheres including magnetite nanoparticles. The SQUID measurements revealed superparamagnetism of nanoparticles.

Thermal Decomposition Synthesis of CoSb3 Nanoparticle by Hot Injection Method (열분해와 Hot Injection법을 이용한 CoSb3 나노분말합성)

  • Kim, Min-Suk;Ahn, Jong-Pil;Kim, Kyung-Ja;Park, Joo-Seok;Kim, Kyoung-Hun;Kim, Hyung-Sun
    • Journal of the Korean Ceramic Society
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    • 제50권6호
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    • pp.476-479
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    • 2013
  • $CoSb_3$ with its high electrical conductivity, Seebeck coefficient and rather low thermal conductivity is quite a promising material for thermoelectric conversion applications. A potentially high figure of merit (ZT) can be achieved by a nanostructure evolution of thermoelectric materials. In this work, $CoSb_3$ nanoparticles were synthesized through a thermal decomposition method in cooperation with a hot injection technique. Nano-sized $CoSb_3$ particles were obtained through the thermal decomposition reaction between the pre-heated cobalt-oleate at $320^{\circ}C$ and the injected antimony oleate with room temperature. The results showed that the particle size was increased with increasing synthesis temperature and the crystallinity of particles was improved with temperature but the decomposition of $CoSb_3$ was observed at $320^{\circ}C$. The $CoSb_3$ particles synthesized at $300^{\circ}C$ showed a high purity and an homogeneous shape with average particle size of 26 nm.