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직접 검화법을 이용한 조제분유의 콜레스테롤 분석법 개발
김진만,박정민,윤태형,임동길,윤창용,정자영,정인식,곽병만,안장혁,Kim, Jin-Man,Park, Jung-Min,Yoon, Tae-Hyung,Leem, Dong-Gil,Yoon, Chang-Yong,Jeong, Ja-Young,Jeong, In-Seek,Kwak, Byung-Man,Ahn, Jang-Hyuk 한국축산식품학회 2011 한국축산식품학회지 Vol.31 No.6
본 연구에서는 조제분유 중의 콜레스테롤을 신속하고 정확하게 분석하기 위해 지방 추출 과정을 거치지 않는 직접 검화 방법을 선택하여 분석법 개발을 시도하였다. 조제분유 분말시료를 직접 검화 수기에 취하여 검화 온도, 검화 시간, KOH 농도의 3가지 인자에 대해 콜레스테롤 회수율이 가장 양호하게 나타나는 최적 검화조건을 확립하고, 검화 후 수세과정에서 액액 분배가 용이한 용매 조건도 확립하였다. 또한 콜레스테롤 피크의 완전한 분리를 위한 적정 기기 조건을 확립하였다. 그 결과, 시료 약 2 g에 16 M-KOH 10 mL를 넣고 $90^{\circ}C$에서 60분 가열하여 검화한 후 diethyl ether로 3회 추출하고 hexane을 최종시험용액으로 하여 기기분석을 했을 때의 회수율이 98.80%로서 가장 양호하게 나타났다. 본 연구를 통해 개발된 조제분유의 효율적인 액액분배 및 직접가열 검화법은 일원배치 분산법에 의해 유화가공식품의 콜레스테롤 분석법으로 유효성이 검증되었으며, 아울러 개발된 전처리 방법 및 기기 분석 조건을 활용해 다양한 분석 기관에서 신속 정확하고 효율적인 콜레스테롤 분석을 수행할 수 있을 것으로 기대된다. 또한 산업체의 품질관리 및 검증기관에서 필요시 모니터링에 적극 활용 가능할 것으로 사료되며, 이를 통해 유화가공식품 류의 함량표시 및 규격관리의 정확성과 효율성 증대에 기여하여 제조업체의 정확하고도 효과적인 품질 및 안전성 확보에 기여할 수 있을 것으로 판단된다. 특히 위해 물질에 대한 정확한 함량 판단이 중요한 조제분유 등의 영 유아용 식품의 안전성 확보에 지대한 공헌을 할 수 있을 것으로 기대된다. An improved cholesterol analysis method was developed for powdered infant formula by gas chromatographic separation after liquid-liquid extraction and partition. In the official Korea Food Standard method for cholesterol analysis, the water phase and solvent phase were not well separated in the case of emulsified foods such as powdered infant formulas and baby foods. For the rapid and simple sample preparation method, an optimized direct saponification condition was established for heating temperature, heating time, and KOH concentration. From the results, the optimum conditions were as follows: heating temperature $90^{\circ}C$, heating time 60 min, and 16 M KOH 10 mL for a 2 g infant formula sample; improved separation condition for gas chromatography was as follows: the initial oven condition was $250^{\circ}C$ for 25 min, the oven temperature was increased to $290^{\circ}C$ by $10^{\circ}C$/min ratio, and finally the oven temperature remained at $290^{\circ}C$for 9 min. The developed method could be implemented for the study of cholesterol, providing the advantages of reduced inspection time and cost in emulsified foods such as infant formula.
임영문,양은익,민석홍 한국안전학회 2004 한국안전학회지 Vol.19 No.3
Most reinforcements in concrete are constructed by steel. Corrosion of reinforcement is the main cause of damage and early failure of reinforced concrete structures. The corrosion is mainly progressed by the chloride ingress. In general, chloride in concrete can be discriminated by two components, total chloride and free chloride. This paper provides a testing method on the coefficient of chloride diffusion in concrete and the relationship between total chloride and free chloride in concrete for the composition of predicting model on diffusion rate of chloride. In order to complete this predicting model, this study will use chloride penetration characteristic, diffusion coefficient, and experiment of color change on silver nitrate solution. This predicting model is going to help that grasp special quality on salt content inclusion of concrete structure that is exposed in chloride environment. Accurate predicting model can be effectively used not only in selecting of repair time but also in preventing from various deteriorations.
PRSV 상태방정식을 이용한 고분자 수용액 계의 기액 평형
임영민,김미경,김기창 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A
In this work, we calculated the vapor-liquid equilibrium of aqueous polymer solutions by using PRSV equation of state combined with C^ex mixing rules(HVO, MHVI, MHV2, LCVM). From the comparison of calculated results with experimental data obtained from literature, we found that calculation results by using MHV1 mixing rule have showed small range of error than HVO, MHV2 and LCVM mixing rules. Calculation results by using the combination of MHV1 mixing rule and UNIFAC-FV model have showed the best result for selected aqueous polymer solutions.
권장연,임영희,임미혜,류재숙,안명희,민득영 한양대학교 의과대학 1998 한양의대 학술지 Vol.18 No.2
The purification methods such as bead-beater destruction, trichloroacetic acid(TCA) precipitation and 3-[(3-cholamidopropyl) dimethylammonio]-1-propane sulfonate(CHAPS) solubilization of Trichomonas vaginalis antigens on sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE) and enzyme-linked immunoelectrotransfer blotting (EITB) were evaluated. Total TCA-precipitated proteins and CHAPS-solubilized extract of T. vaginalis possessed common protein bands whose molecular weights were at 28 kDa, 35 kDa, 40 kDa, 50 kDa, 60 kDa, 100 kDa, 120 kDa, 130 kDa, and 160 kDa, and bead-beater treated trichomonal proteins represented some different spectrum of protein bands from TCA- or CHAPS-treated ones in that they didn't show high M.W. protein bands(〉100 kDa) on SDS-PAGE. But similar antigenic bands with the molecular weights of 60 kDa, 110 kDa, 120 kDa and 140 kDa by EITB were identified in TCA-, CHAPS- and bead-beater treated proteins. In conclusion, TCA-precipitation and CHAPS-solubilization were more stable methods to analyse trichomonal proteins than extraction with bead-beater, and the result will be useful for antigen analysis of Trichomonas vaginalis to elucidate a mechanism of pathogenesis in host-parasite relationship.
Post-Annealing Effects on Properties of ZnO Nanorods Grown on Au Seed Layers
Cho, Min-Young,Kim, Min-Su,Choi, Hyun-Young,Yim, Kwang-Gug,Leem, Jae-Young Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.3
ZnO nanorods were grown by hydrothermal method. Two kinds of seed layers, Au film and island seed layers were prepared to investigate the effect of seed layer on ZnO nanorods. The ZnO nanorod on Au island seed layer has more unifom diameter and higher density compared to that of ZnO nanorod on Au film seed layer. The ZnO nanorods on Au island seed layer were annealed at various temperatures ranging from 300 to $850^{\circ}C$. The pinholes at the surface of the ZnO nanorods is formed as the annealing temperature is increased. It is noted that the pyramid structure on the surface of ZnO nanorod is observed at $850^{\circ}C$. The intensity of ZnO (002) diffraction peak in X-ray diffraction pattern and intensity of near band edge emission (NBE) peak in photoluminescence (PL) are increased as the ZnO nanorods were annealed at the temperature of $300^{\circ}C$.