졸-겔법으로 제조한 $PbTiO_3$ Interlayered PZT 박막의 미세구조와 강유전 특성

임동길,최세영,정형진,오영제 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.12

Microstructure and ferroelectric properties of sol-gel derived PZT(52/48) and PT interlayered PZT(52/48) thin films on Pt/Ti/SiO2/Si substrates were investigated. Films were fabricated using Acetylacetone chelated PT and PZT(52/48) sols. PZT(52/48) thin films annealed at $700^{\circ}C$ for 20 min showed the rosette structure with the size of 1.2~1.6${\mu}{\textrm}{m}$ and the pyrochlore phse was contained. PT interlayered PZT thin films, which is inserted by PbTiO3 thin layer with the thickness of 130 $\AA$ between PZT thin film and electrode, consisted of a single perovskite phase after annealing above 55$0^{\circ}C$. They exhibited the uniform and columnar grains of 0.1~0.16${\mu}{\textrm}{m}$, which are applicable for microelectronic device including non-volatile memory. Typical P-E hysteresis loops could be obtained from PT interlayered PZT thin film at as low as the annealing temperature of 50$0^{\circ}C$. Ferroelectric properties of PT interlayered PZT thin films were improved as increasing annealing temperature up to $700^{\circ}C$, and then deteriorated at 75$0^{\circ}C$. PZT(52/48) and PT interlayered PZT(52/48) thin film annealed at $700^{\circ}C$ for 20 min displayed Ps=38.8$\mu$C/$\textrm{cm}^2$, Pr=10.0$\mu$C/$\textrm{cm}^2$, Ec=65.3 kV/cm and Ps=28.5$\mu$C/$\textrm{cm}^2$, Pr=9.8$\mu$C/$\textrm{cm}^2$, Ec=76.1 kV/cm, respectively.

음식점 식육 원산지 표시 모니터링

홍진,임동길,김미경,박경식,윤태형,노기미,정자영 한국식품위생안전성학회 2010 한국식품위생안전성학회지 Vol.25 No.2

The compulsory beef labelling system has launched from January 1st 2007 by the amended Food Hygiene Law, we were checked the actual conditions of beef origin with a nationwide scale by the Hanwoo differentiation specific test method which was developed by Korea FDA using 90 SNP biomarkers. The test method is useful tool to differentiate the beef origin carrying out the mission of KFDA's annual food safety management guidance. Also we have technically transferred the Hanwoo differentiation specific test method to other institutes as well regional KFDA and established the training program as a regular course in Korea Human Resource Development Institute for Health and Welfare. The beef used in this study were collected according to the 2009 Food safety guidance in roast beef restaurants where business site area greater than 100 m2. Total 216 samples were consisted of 48samples of the Seoul area and 168 of the region. The monitoring result from restaurants in all the region of Korea showed that 3 of 216 Hanwoo-labelled beefs were found out as a non-Hanwoo (1.3%). This results are gradually deceasing trend compared with 34.0% in 2005, 30.1% in 2006, 3.2% in 2007 and 5.14% in 2008. From these data, the Hanwoo differentiation specific test method on the settlement of the compulsory beef labelling system has an important role. As a outcome of this project, we might be considered the early settlement of the compulsory beef labelling system, technically transferred to other institutes and the establishment of regular training program of the test method.

[OP-04] SPME를 이용한 합성수지 포장재 중 Acrylonitrile 분석법 확립

유현미,임동길,이광수,이양봉 한국식품영양과학회 2006 한국식품영양과학회 학술대회발표집 Vol.2006 No.10

HPLC를 이용한 건강기능식품 중 코엔자임 Q10 성분 분석

노기미,정자영,임동길,김미경,박경식,윤태형,홍진,박선영 한국식품위생안전성학회 2011 한국식품위생안전성학회지 Vol.26 No.1

A method based on high-performance liquid chromatography (HPLC) with ultraviolet detection has been developed to quantify coenzyme Q10 (CoQ10) in raw materials and dietary supplements. Single-laboratory validation has been performed on the method to determine linearity, selectivity, accuracy, limits of quantification (LOQ) and repeatability for CoQ10. An excellent linearity (r = 0.999) was observed for CoQ10 in the concentration range 15.625~500 μg/mL in dietary supplement. Observed recovery of CoQ10 was found to be between 98.33 and 99.38%. LOQ was found to be 250 μg/mL Repeatability precision for CoQ10 was between 0.15 and 0.21% relative standard deviation (RSD). Further, limited studies showed that some adulterants and degraded material could be satisfactorily separated from CoQ10 and identified.

새로운 연구결과 소개

이청현,김요셉,임동길,김유신,Vincenzo Tamma,김윤호 한국물리학회 2024 물리학과 첨단기술 Vol.33 No.3

Application of Rapid Sample Preparation Method and Monitoring for Cholesterol Content in Chicken Egg and Egg powder

박정민,정인식,곽병만,안장혁,임동길,정자영,김진만 한국축산식품학회 2013 한국축산식품학회지 Vol.33 No.5

The aim of this study was to develop sample preparation method and evaluate the exact cholesterol content in egg and egg powder purchased from Korean markets, and to determine whether significant differences exist among various egg prod-ucts, since a variety of products are available in Korean markets and there are no recent databases for cholesterol. To eval-uate the cholesterol content in chicken egg sold in Korean local market, a simple method using non-heated saponification to determine cholesterol for emulsified foods was applied. The results of recovery for egg and egg powder were in a range of 92.4-105.0%, with a relative standard deviation between 1.1% and 2.8% by using gas chromatography-flame ionization detector. Therefore, the total cholesterol content in whole egg was estimated between 160.8 and 226.3 mg/egg (AV(average)186.8±3.5), which is similar or lower than previously reported levels. The value for cholesterol in egg powder was estimated between 2.94 and 3.49 mg/g (AV 3.23±0.15). We suggested method that can be applicable to chicken egg and egg powder matrix as providing rapid and accurate determination of cholesterol in egg and egg powder. This information will be helpful for processed food producers for deciding food labels of cholesterol content.

GIS 공간통계를 이용한 군산시 염분 피해 특성 분석

이근상(Lee, Geun Sang),임동길(Lim, Dong Gil),유두철(Yu, Du Cheol),조기성(Cho, Gi Sung) 대한공간정보학회 2011 한국지형공간정보학회 학술대회 Vol.2011 No.5

알로에 베라(Aloe vera) 겔 중 총 다당체 시험법 개선

이영주,정지영,김윤제,임동길,윤태형,신지은,윤창용,김정훈,박미선,강태석 한국식품위생안전성학회 2012 한국식품위생안전성학회지 Vol.27 No.3

This study intented to standardize the method for total polysaccharide, which is a functional marker for aloe vera gel in Korea. We used four lyophilized raw materials and commercial aloe gel products, certified as Health Functional Food by Korea Food and Drug Administration, including powder, solution, jelly, tablet and capsule,to optimize the analytical condition of dialysis and phenol-sulfuric acid reaction in polysaccharide analysis. The optimal conditions for polysaccharide analysis included 1 L water for dialysis and change 3 times for 24hr against 25 mL prepared sample solution. Validation test showed lower than 5% of coefficient of variation(CV) in intra-, interday validation in lyophilized raw materials and 4 types of commercial products. In inter-person and inter-laboratory validation with 4 persons from 4 different laboratories, CV(%) were 5.50 and 6.64 respectively. The linearity of polysaccharide analysis was assessed using 5 serial concentration of lyophilized raw materials(0.1, 0.2, 0.3, 0.4,0.5%(w/v)). The results showed R2≥ 0.995 of high linearity. In the commercial aloe vera gel products, the results of reproductivity showed lower than 7.08% and revealed that the standardized method from this study ensured high precision for polysaccharide analysis.

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.

수입 및 국내 다류제품중의 중금속 함량과 분포도에 관한 연구

최광식,장영미,오재호,이광수,임동길,구용의,이순호,이선화,김재이,김진숙,강금자 식품의약품안전청 1998 식품의약품안전청 연보 Vol.2 No.-

기호성식품인 다류제품에 함유된 새육 필수 금속원소들(Cr, Ni,Cu,Se,Zn)과 ㅐ로이 위해성 물질로 논란이 많은 Al 및 유해성 금속(Hg, Pb,Cd, As)들을 포함한 10종의 금속원소으 함량을 분석하엿다.생육 필수 금속원소들은 과량 섭취의 위험성과 Al의 겨우는 기본적인 함ㄹ야에 대한 데이터확보, 유해성 금속드르이 경우는 그 오염도를 확인하여 이를 통하 ㄴ다류제품의 안전성과 기준규격설정의 기초자룔르 제시하고자 하엿다. 각 다류제품별 비교분석에서 모든 다류 중 생육필수 금속원소들의 과량섭취 위험성은 낮았으며 유해성 긍속의 평균함량도 낮게 나타났다. 그러나 유금속의 최고 함량은 유자차에서 Pb이 7.2ppm(건고물기준, 애하 모든 농도는 건고물기준으로 표시)으로 나타났고 As웨 경우는 다시마차에서 3.gppm까자 검출되었다. 다류제품을 식품공전에 따라 4그룰 슥, 침출차,추굴차, 분말차, 과시차로 나누어 비교 분석한 결과는 침출차에서 Al, Zn,'Cu, Ni 둥좌 함량이 다른 차종에 비해 유의성 있게 높은 것으로 나타났다. 수입침출차와 국산침출차의 금속원소참량 비교결롸는 Al의 경우 국산제픔보다 수입제품페서 평균1.5배 높았으며 Cu도 약 2.6배 높게 나타났다. 실제 침출차(홍차,현미녹차,녹차)의 침출시간에 따른 Al의 유리량은 실온에서 90~95℃물로 3분간과 10분간 침출시 평균 20.2~62.7%유리되어 일일섭취량과 비교시 실제 섭취하는 양은 낮은 것으로 나타났다. In order to confirm the safety and offer the guideline of restriction on metal elements in tea products, the contents of Al, Cr, Ni, Cu, Zn, As, Se, Cd, Pb and Hg were measured witIL a ICP-IHASSand a mercury analyzer. It was estimated that tile average of the harmful metal contents(As, Pb, Cd,Hg) and the the essentiat metal elements(Cr, Ni, Cu, Zn, Se) were relativelf low. However, the maxi-raum content of lead(Pb) was up to T.2mg/kg drr· weight in a citron tea. In case of arsenic(As), it was3.gmg/11g dry wright in a tang tea. The contents cif alumiuiuin(Al) in a black tea and an unpolished rice& green tea were higher than other tea products. In a blaclt tea, it was detected that the average aBdthe maxieum of aluminium contents were 1253.9 and 4789.Smg/ltg dry weight respectively. When ablack tea, aB unpolished rice & green tea and a green tea were steeped in 90-95'c water(for 3 min. and10 min.) at room temperature,20.2-62.7% of Al centent was extracted.