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Lee, Hyeri,Riu, Myoungjoo,Kim, Eunhye,Moon, Joon-Kwan,Choi, Hoon,Do, Jung-A,Oh, Jae-Ho,Kwon, Ki-Sung,Lee, Young Deuk,Kim, Jeong-Han 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.2
A single residue analytical method was developed for herbicide chlorpropham in various crops. Brown rice, apple, mandarin, Kimchi cabbage, green pepper, potato, and soybean were selected as representative crops, and clean-up system, partition solvent, and extraction solvent were optimized. For high performance liquid chromatography (HPLC), $C_{18}$ column was used with elution solvents of water and acetonitrile. Limit of quantitation (LOQ) of chlorpropham was 2 ng (S/N >20), and excellent linearity ($R^2$=1.000) was achieved. Method limit of quantitation (MLOQ) was 0.02 mg/kg. For recovery tests, crop samples were macerated and fortified with chlorpropham standard solution at three fortification levels (MLOQ, 10 MLOQ, and 100 MLOQ). And then those were extracted with acetonitrile, concentrated and partitioned with n-hexane. The n-hexane layer was then concentrated, cleaned-up through Florisil$^{(R)}$ column with ethyl acetate:n-hexane (5:95, v/v) prior to concentration and analysis with HPLC. Good recoveries from 76.8 to 107.9% with coefficients of variation of less than 10% were obtained, regardless of sample type, which satisfies the criteria of Korea Food and Drug Administration. Those results were confirmed with liquid chromatography-mass spectrometry (LC-MS). The method established in this study could be applied to most of crops as an official and general method for the analysis of chlorpropham residue.
Production of Submicrometer-Sized Hexahydro-1,3,5-trinitro-1,3,5-triazine by Drowning-Out
Lee, Jae-Eun,Kim, Jun-Woo,Han, Sang-Keun,Chae, Joo-Seung,Lee, Keun-Deuk,Koo, Kee-Kahb American Chemical Society 2014 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.53 No.12
<P>In the drowning-out crystallization of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) with a spray, effects of operating parameters such as spray distance, solute concentration, and antisolvent temperature on crystal size were investigated. It was found that there exists an optimum spraying distance of solution for the production of submicrometer-sized crystals: the crystal size decreases with increasing spray distance in the distance shorter than the optimum distance due to incomplete atomization and that increases with the spray distance at the distance longer than the optimum distance due to coalescence among fluttered droplets. Higher RDX concentration in starting solution induced larger product particles. However, too low RDX concentration was also found to be not preferred for the small-sized product since nucleation occurs after complete mixing of atomized solution droplets with the antisolvent. By similar reason, it was found that lower antisolvent temperature, which causes faster nucleation, is preferred for the small-sized product. However, too low temperature was shown to be not preferred because of an increase in coalescence between droplets which leads to agglomeration. Finally, poly(vinylpyrrolidone) (PVP) was found to act as a nucleation promoter in the drowning-out crystallization with the acetone/water system, and RDX particles with an average size of 790 nm were successfully produced.</P>
( Sung Hwa Sohn ),( Sang Yeon Lee ),( Jun Choi ),( Ho Hee Jang ),( Tae Hoon Kang ),( Jong Keun Kim ),( In Kyoung Kim ),( Deuk Ki Lee ),( Seulgi Choi ),( Il Sub Yoon ),( Ji Woo Chung ),( Jae Hwan Nam ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.12
Apios americana Medik (hereinafter Apios) has been reported to treat diseases, including cancer, hypertension, obesity, and diabetes. The therapeutic effect of Apios is likely to be associated with its anti-inflammatory activity. This study was conducted to evaluate the protective effects of Apios in animal models of acute lung injury induced by lipopolysaccharide (LPS) or pandemic H1N1 2009 influenza A virus (H1N1). Mice were exposed to LPS or H1N1 for 2-4 days to induce acute lung injury. The treatment groups were administered Apios extracts via oral injection for 8 weeks before LPS treatment or H1N1 infection. To investigate the effects of Apios, we assessed the mice for in vivo effects of Apios on immune cell infiltration and the level of pro-inflammatory cytokines in the bronchoalveolar lavage (BAL) fluid, and histopathological changes in the lung. After induction of acute lung injury, the numbers of neutrophils and total cells were lower in the Apios-treated groups than in the non-Apios-treated LPS and H1N1 groups. The Apios groups tended to have lower levels of tumor necrosis factor-a and interleukin-6 in BAL fluid. In addition, the histopathological changes in the lungs were markedly reduced in the Apios-treated groups. These data suggest that Apios treatment reduces LPS- and H1N1-induced lung inflammation. These protective effects of Apios suggest that it may have therapeutic potential in acute lung injury.
Determination of Buprofezin Residues in Rice and Fruits Using HPLC with LC/MS Confirmation
Lee, Young-Deuk,Jang, Sang-Won The Korean Society of Environmental Agriculture 2010 한국환경농학회지 Vol.29 No.3
A high-performance liquid chromatographic (HPLC) method was developed to determine buprofezin residues in hulled rice and fruits. The buprofezin residue was extracted with acetone and the extract was stepwise purified by liquid-liquid partition and Florisil column chromatography. For rice samples, acetonitrile/n-hexane partition was additionally employed to remove nonpolar lipids. Reversed phase HPLC using an octadecylsilyl column was successfully applied to separate buprofezin from sample co-extractives, as detected by ultraviolet absorption at 250 nm. Recovery experiment at the limit of quantitation validated that the proposed method could evidently determine the buprofezin residue at the level of 0.02 mg/kg. Mean recoveries from hulled rice, apple, pear, and persimmon samples fortified at three tenfold levels were in the range of 80.8~85.2%, 89.1~98.4%, 88.8~95.7% and 90.8~96.2%, respectively. Relative standard deviations of the analytical method were all less than 5%, irrespective of sample types. A selected-ion monitoring LC/mass spectrometry with positive electrospray ionization was also provided to sensitively confirm the suspected residue.
( Sang Jun Lee ),( Dong Hye Suh ),( Kye Yong Song ),( So Min Kim ),( Sang Hyun Cho ),( Jeong Deuk Lee ),( Hei Sung Kim ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.2
Background: Facial skin rejuvenation has long been the most highly desired aesthetic procedure. The demand for no-downtime procedures in skin rejuvenation has guided researchers to develop newer non-invasive procedures based on thermal effects that result in collagen remodeling. Objectives: The purpose of this prospective pilot study was to assess the effectiveness and safety of intraoral treatment with Er: YAG laser using a non-ablative mode. Methods: Nine patients were treated with a 2940 nm Er:YAG laser using the intra-oral technique. All received three sessions of treatment. Wrinkles severity (the nasolabial fold and the perioral wrinkles) was assessed by two independent evaluators before and after each treatment using the Modified Fitzpatrick Wrinkle Scale. A skin biopsy was also performed before and 3 months afterthe final session. Results: The mean patient age was 52 years. A significant reduction of perioral wrinkles was observed after treatment. The therapy was also very well tolerated by all patients, with no discomfort described. Histologic evaluation showed greater dermal collagen with thickening of the dermis and straightening of elastic fibers in the reticular dermis after treatment. Conclusion: Through this pilot study, we describe a new non-invasive intraoral method using Er: YAG in a non-ablative mode for efficient reduction of perioral wrinkles, with no down time and no adverse effects observed.
Sang-Ho Lee,Jung-Pyo Hong,Ji-Young Lee,Young-Kil Kwon,Young-Sik Jo,Seung-Kyu Baik,Jae-Deuk Lee IEEE 2007 IEEE transactions on applied superconductivity Vol.17 No.2
<P>This paper proposes an effective parametric design for high temperature superconducting (HTS) synchronous motors with 3D equivalent magnetic circuit network (EMCN) method. Proposed design process consists of 5 steps which are electric design, mechanical design, characteristic analysis for field and armature, and motor characteristic analysis. Especially, in order to predict the performance of HTS synchronous motors, the variation of output power characteristics according to the variation of back electromotive force (BEMF) and inductance is analysed in electric design. Reliability of proposed design process and developed program is verified through the comparison of the results of commercial program using 3D finite element analysis (FEA) method.</P>