• Title/Summary/Keyword: Preparation conditions

Search Result 1,697, Processing Time 0.026 seconds

High Performance Liquid Chromatographic Determination and Content Uniformity of Aclatonium Napadisilate Preparation (고속액체 크로마토그라프법을 이용한 제제중 Aclatonium Napadisilate의 정량 및 함량균일성에 관한 연구)

  • Kim, Myun-Chong;Park, Sae-Ho;Roh, Hwoe-Suk;Kim, Yong-Ju;Huh, Jae-Doo
    • Journal of Pharmaceutical Investigation
    • /
    • v.16 no.2
    • /
    • pp.72-75
    • /
    • 1986
  • A convenient high performance liquid chromatographic method was established for the quantitative determination and content uniformity test of aclatonium napadisilate preparation. This method was more simple to make the sample solution for injection, and easy to determine the content in the preparation. Aclatonium napadisilate was chromatographed using a $Lichrosorb-NH_2$ column $(4mm\;{\times}\;25\;cm$, and acetonitrile-water mixture (83:17) as an eluent at a flow rate of 1.8 ml/min. RI-detector response was linear over a range of $0.5{\sim}2.0%$ aclatonium napadisilate under above conditions. Reproducibility studies gave relative standard deviation of 1.29%.

  • PDF

Preparation and characterization of prospective disulfide based electrode materials for lithium batteries

  • Ragupathy, Dhanusuraman;Gopalan, Anantha Iyengar;Lee, Kwang-Pill
    • Analytical Science and Technology
    • /
    • v.21 no.1
    • /
    • pp.25-33
    • /
    • 2008
  • Organic disulfide compounds are having higher theoretical capacity than the conventional cathode material and are considered as the important storage material. Here, we are reporting the preparation of poly (2,2'-dithiodianiline) PDDA/multiwall carbon nanotubes, (MWCNTs) composites under different experimental conditions. Amine functionalized and unfunctionalized MWCNTs were independently used for the preparation of composites. Composites were prepared in the presence of cetyl trimethyl bromide (CTAB), a cationic surfactant, and also in the absence of CTAB. A physical mixture of PDTDA and MWCNTs was formed with unfunctionalized MWCNTs. Grafting of PDDA onto MWCNTs was performed by chemical oxidative polymerization of 2, 2'-dithiodianiline in the presence of amine functionalized MWCNTs. The composites of MWCNTs and PDTDA were characterized for structure, morphology and thermal properties through Fourier transform infrared spectroscopy, Fourier transform Raman spectroscopy, scanning electron microscopy and UV-visible spectroscopy. The composite materials prepared by this method are expected to find applications as electrode materials for lithium batteries.

Optimization of Preparation Conditions and Quality Characteristics of Sweet Pumpkin Stock (단호박 스톡 제조조건의 최적화 및 품질 특성)

  • Han, Chi-Won;Park, Won-Jong;Seung, Suk-Kyung
    • Food Science and Preservation
    • /
    • v.15 no.6
    • /
    • pp.832-839
    • /
    • 2008
  • The stock that is the first step for preparation of soups and purees links to the taste of food. Many types of vegetable have been used in stocks, but this study focused on stocks prepared with sweet pumpkin. The stock preparation conditions including the weight of sweet pumpkin, the water volume, and the boiling time at $97^{\circ}C$ were optimized by response surface methodology. The quality characteristics of the resulting stock were investigated. The color, flavor, taste and overall acceptability were dependent parameters. A model equation was proposed with regard to the sweet pumpkin weight, water volume, and boiling time at $97^{\circ}C$. A sweet pumpkin weight of 357.9 to 403.0 g, a water volume of 689.8 to 768.5 mL, and a boiling time of 9.9 to 10.3 min at $97^{\circ}C$ were found to be the optimal stock preparation conditions. The quality characteristics of the sweet pumpkin stock prepared under the optimized conditions were pH 6.64, total acidity 0.18%, soluble solids $2.39\;^{\circ}Brix$, color value (L, 99.07 a, -2.43 b, 11.82), total polyphenol 280.75 mg/L, and electron donating ability 21.32%.

Preparation Conditions of Agar Oligosaccharides with Organic Acids (한천 올리고당 제조를 위한 유기산 처리 조건)

  • JOO Dong-Sik;KIM Ok-Seon;CHO Soon-Yeoung;LEE Chang-Ho
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.36 no.1
    • /
    • pp.6-10
    • /
    • 2003
  • The optimum organic acid and temperature conditions were investigated for the preparation of oligosaccharides from agar. The tested organic acids were acetate, citrate, lactate, malate, and succinate and the conditions for oligosaccharides preparation were $0.3\%,\;0.5%;and\;0.7\%$ organic acid concentrations at $80\~120^{\circ}C.$ The low concentration of organic acid below $0.3\%$ decreased the degrading ratio and the high concentration up $0.5\%$ could not changed the degrading ratio. Conditions below $100^{\circ}C$ was not good for degrading agar. But $100^{\circ}C\;or\;120^{\circ}C$ was optimal temperature conditions for agarooligosaccharides according to the organic acid type and concentration. The organic acid concentration was $0.5\%$ and organic acid was the citrate or malate. The treatment time considered optimum was 120$\~$180 min. The maximal degrading ratio giving optimum conditions such as $100^{\circ}C\;and\;120^{\circ}C\;was\;35.5\%\;and\;38.7\%,$ respectively. The agarooligosaccharides prepared by autoclaving at $100^{\circ}C\;and\;120^{\circ}C$ were 2$\~$7 species oligomer.

Effect of Health Condition and Preparation for Old Age of University Students on Awareness of Successful Aging (대학생의 건강상태와 노후준비가 성공적인 노화인식에 미치는 영향)

  • Ha, Eun Ho;Lee, Young Mi
    • Journal of Korean Public Health Nursing
    • /
    • v.34 no.2
    • /
    • pp.198-210
    • /
    • 2020
  • Purpose: This study was undertaken to identify the effect of current health conditions and preparation for old age of university students on the awareness of successful aging. Methods: Totally, 273 university students, based across several cities in South Korea, were enrolled for the study. Data collected were analyzed by applying descriptive statistics, independent t-test, one-way ANOVA, Pearson correlation coefficients, and hierarchical multiple regression, using the SPSS Statistics 23.0. Results: There were three types of hierarchical regression model for awareness of successful aging in university students. Its explanatory power of each model was adjusted R2 of .04, 07, and .31 respectively. Major (β=.14, p=.007), health condition (β=.13, p=.028), preparation for old age (β=.52, p<.001) were significant predictors of awareness of successful aging. Conclusion: Our study results indicate that for university students, diverse interventions to promote the awareness of successful aging must focus on improving the health condition and enhancing preparation for old age.

Effect of preparation based on Paenibacillus ehimensis on the content of alkaloid lappakonitine in harvested rhizomes of Aconitum septentrionale

  • Fedorov, N.I.;Ibatullina, Z.A.;Mikhaylenko, O.I.;Zhigunova, S.N.;Shendel, G.V.;Kuzmina, L.Y.;Abdrakhimova, G.S.;Melentiev, A.I.;Kudoyarova, G.R.
    • Journal of Plant Biotechnology
    • /
    • v.45 no.3
    • /
    • pp.273-278
    • /
    • 2018
  • We performed an analysis of the effect of postharvest treatment of rhizomes of Aconitum septentrionale Koelle with the biological preparation of Bacispecin based on a cytokinin producing strain of Paenibacillus ehimensis IB-739 on the content of alkaloid lappaconitine in rhizomes. The total alkaloid content was assayed based on exhaustive extraction method. The lappaconitine content was measured by HPLC. The efficiency of the preparation was dependant on either the concentration or intensity of the growth processes in rhizomes. Both parameters varied depending on the stage of development of plants and the amount of precipitation. In the years with normal precipitation, concentrations of Bacispecin ranging from 5 to 10 g/l were found to be most effective for increasing lappaconitine content in rhizomes of A. septentrionale. Whereas, under local drought conditions, the concentration of preparation should be less than 2 g/l.

Performance of Adhesives for Bonding Fresh Concrete to Hardened Concrete under Application Conditions (신ㆍ구 콘크리트 접착제의 시공조건에 따른 성능)

  • 이찬영;심재원
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2002.10a
    • /
    • pp.513-518
    • /
    • 2002
  • In vertical construction joint, adhesives such as epoxy, acrylic, latex, etc. have been usually used for bonding fresh concrete to hardened concrete. In this study, performance of adhesives under various application conditions was investigated through tests for slant shear and flexural strength. From the results of the tests, it is found that superior bonding performance can be obtained under good surface preparation without adhesive when high strength concrete is used.

  • PDF

Monitoring system of the grinding working conditions (연삭 작업상태 감시 시스템 개발)

  • 김성렬;윤덕상;김화영;안중환
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1997.10a
    • /
    • pp.387-390
    • /
    • 1997
  • Grinding process takes a long time that grinding machine is setted properly. It is difficult for user to judge correctly the abnormal states generated in grinding process. Air grinding has to be reduced for the improvement of productivity. In addition, it is important to monitor the dressing and the grinding process so that the grinding working maintains optimal grinding conditions. In this study, the monitoring system using the acoustic emission is developed to monitor these processes continuously. This system was able to reduce the preparation as well as the machine setting time in grinding operation.

  • PDF

신경망 모델을 이용한 밀링공구의 이상진단에관한 연구

  • 이상석;김희술
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1993.04b
    • /
    • pp.71-75
    • /
    • 1993
  • The application of artificial neural network forcondition monitoring and diagnosis of milling tools was introduced. To detect the conditions of milling tools, the monitoring wywtem consists of three phases: "preparation phase", "learning phase", "production phase". The conditions of milling tools were categorized into the three states. "normal", "warning", "abnormal". The dectection of tool condition, in this paper, could be successfully performed by monitoring the variation of power spectrum on Y dirctional cutting force.

MnZn Ferrite Preparation by Coprecipitation Method (공침법에 의한 MnZn Ferrite 분말제조 연구)

  • 엄태형;고성만;서동수;양준환;박균하
    • Journal of the Korean Ceramic Society
    • /
    • v.30 no.6
    • /
    • pp.478-484
    • /
    • 1993
  • The influence of reaction conditions on the MnZn ferrite coprecipitation process were investigated using mixed metla sulfate solution and ammonium oxalate. In order to minimize the metallic ion losses and to control the particle size, the optimum reaction conditions were as follows; reaction temperature $25^{\circ}C$, metal sulfate concentration 0.3M, molar ratio of ammonium oxalate/mixed metal sulfate 1.1:1. The production yield was as high as 97.6% of theoretical yield at optimum reaction condition.

  • PDF