[화학] 이온쌍 HPLC / FLD를 이용한 생체 시료중의 Glutathione 농도 분석

유정연(Jeong-Yeon Yoo),이경옥(Kyoung-Ok Lee),신호상(Ho-Sang Shin) 한국분석과학회 1999 분석과학 Vol.12 No.1

Anodic Stripping Voltammetric Determinations of Zinc, Cadmium, Lead and Copper in Freshwater and Sediment

한영희,유정연,Hahn, Young Hee,Yoo, Jeong Yeon Korean Chemical Society 1997 대한화학회지 Vol.41 No.4

매달린 수은 방울 전극(HMDE) 또는 얇은 수은막 전극(TMFE)을 사용하여 금속이온들을 은/염화은(포화 KCl) 기준전극에 대하여 -1,200 V에서 150초 동안 전해시켜서 수은전극에 농축시키고 펄스 차이 전압전류법(DPASV)과 네모파 전압전류법(SWASV)으로 산화전극 벗김 분석을 하여 동시에 아연, 카드뮴, 납 및 구리를 정량분석하였다. HMDE를 사용하여 DPASV로 네 가지 금속이온을 동시 정량분석시 각각의 금속이온의 봉우리 전류는 20~100 ppb 농도범위에서 직선성을 보여주었으나 TMFE를 사용하여 DPASV 또는 SWASV로 네 가지 금속이온을 동시 정량분석시에는 $Cd^{2+}$와 $Pb^{2+}$의 봉우리 전류만 DPASV의 경우 100 ppb까지 SWASV의 경우 10 ppb까지 직선성을 나타내었다. $Cd^{2+}$와 $Pb^{2+}$의 동시 정량분석의 경우 TMFE를 사용한 DPASV 분석은 HMDE를 사용한 DPASV보다 약 15배 더 민감하였으며 TMFE에서 SWASV는 DPASV보다 약 5배 더 민감하였다. 퇴적물에 함유된 아연의 농도를 HMDE를 사용한 DPASV 분석법과 유도 결합 플라스마-질량분석법으로 일곱개의 시료에 대하여 정량분석하여 비교하였더니 상관계수가 0.9993으로 높았고 t-test결과 두 방법 사이에는 유의성 있는 차이가 없었다. Zinc, cadmium, lead and copper were simultaneously determined by depositing metals at - 1.200 V vs. a Ag/AgCl(sat. KCl) reference electrode for 150 seconds on a hanging mercury drop electrode(HMDE) or a thin mercury film electrode(TMFE), followed by scanning towards anodic direction using differential pulse voltammetric(DPASV) and square wave voltammetric(SWASV) techniques. The linear calibration curves were obtained for four metal ions simultaneously determined by DPASV with a HMDE in the concentration range between 20 and 100 ppb. However, the linear calibration plots were obtained only for $Cd^{2+}$ and $Pb^{2+}$ in the simultaneous determinations with a TMFE in the concentration range up to 100 ppb using DPASV and up to 10 ppb using SWASV. DPASV with a TMFE was about 15 times more sensitive than DPASV with a HMDE for simultaneous determinations of $Cd^{2+}$ and $Pb^{2+}$. SWASV was about 5 times more sensitive than DPASV at a TMFE. Concentrations of zinc in seven different sediment samples determined by DPASV with a HMDE and inductively coupled plasma-mass spectrometry were compared, resulting with an excellent correlation coefficient of 0.9993 and with no significant difference between two methods after t-test.

솔라시뮬레이터와 시뮬레이션을 이용한 슬림형 이중외피 창호 시스템의 태양열취득률(SHGC) 분석

조경주(Cho, Kyung-Joo),조동우(Cho, Dong-Woo),유정연(Yoo, Jeong-Yeon) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.10

A double skin system for curtain wall buildings has been proposed as an energy efficient system because it is known to minimize environmental impacts from outside while utilizing natural conditions. If applied with appropriate plans, various environmental advantages can be secured, such as reducing heating load by thermal buffering in winter, and cooling load by blocking. Although a variety of methods have been devised for reducing building energy consumption in double skin window systems, improving insulation performance has generally been the main focus, unfortunately which causes overheating in summer, not only increasing cooling loads but also resulting in thermal discomfort for residents. Therefore, quantitative performance analysis data such as Solar Heat Gain Coefficient (SHGC) of the developed Slim-type Double Skin Window (SDSW) Systems need to be presented in order to reduce cooling energy consumption. In this study, various SHGC tests of the SDSW system using solar simulator have been conducted in conditions of blinds open and closed, and in different window opening positions. Simulation evaluations applying these data were carried out for comparison with the values obtained by SHGC experiments. Values of the SHGC tests based on KS L 9107 ranged from 0.07 to 0.30. Furthermore, Simulation tools Window grounded on ISO 15099 were used for calculating SHGC, and these results were within 5% of the SHGC test values as per KS L 9107. In total, SHGC data of 20 type samples are presented for the developed SDSC system, and the samples are categorized according to the glass type and the blind slit angles.

Measurement of Total Plasma Homocysteine in Patients with Chronic Renal Failure Using HPLC/FLD

Kyung-Ok Lee(이경옥),Bo-Kyung Kang(강보경),Hyung-Jin Roh(노형진),Kwang-Suk Ryoo(류광석),Jeong-Yeon Yoo(유정연),Man-Jeong Paik(백만정),Kang-Hyeob Lee(이강협) 대한의생명과학회 1997 Biomedical Science Letters Vol.3 No.1

본 연구에서는 한국인 만성신부전증 환자에서 심혈관계 질환의 조기진단을 위한 생화학적 표지자로서 homocysteine의 임상적 유용성을 검토하기 위하여, 만성신부전증 환자와 건강인에서 HPLC/FLD (high performance liquid chromatography/fluorescence detector)를 이용하여 혈장 homocysteine 농도를 측정하고 그 결과를 비교하였다. 본 실험방법의 회수율은 98.6±5.8%를 나타내었으며, 0.2 n㏖/L보다 낮은 농도까지 측정이 가능하였고, 2~50 n㏖/㎖까지 직선성이 성립하였다 (correlation coefficient =0.9997). 한국인 중 건강한 정상인 (20명)과 만성신부전증 환자 (90명)에서 혈장 homocysteine은 각각 6.81±1.54 n㏖/㎖과 27.28±14.94n ㏖/㎖이었으며, 환자군에서는 정상인군에 비하여 약 4 배 정도 높은 수치를 나타내었다 (p<0.05). 본 실험의 결과로 볼 때 HPLC/FLD를 이용한 homocysteine 측정은 예민도와 재현성이 높아 routine 실험실 방법으로 유용성이 높을 것으로 생각되며, 또한 혈장 homocysteine의 측정은 만성신부전증 환자의 주요한 사망원인이 되는 폐쇄성 동맥질환을 조기에 진단하거나, 혹은 homocysteine 농도를 저하시키는 치료를 실시한 후 치료효과를 판단하기 위한 생화학적 marker로 활용될 수 있을 것으로 기대된다. Cardiovascular disease has been the leading cause of death among patients with chronic renal failure. Many reports have been described that homocysteine is one of the independent risk factor to the occulsive vascular disease. In this study, HPLC/FLD (high performance liquid chromatography-fluorescence detector) technique was used to measure homocysteine level in patients with chronic renal failure and normal control group. The detection limit and recovery of total plasma homocysteine using HPLC/FLD were 98.6±5.8% and 0.2 n㏖/㎖, respectively. The linearity of this method was established in concentration range of 2~50 n㏖/㎖ (correlation coefficient=0.9997). The concentrations of total plasma homocysteine were 6.81 ± 1.54 n㏖/㎖ and 27.28 ± 14.94 n㏖/㎖ in normal control (n=20) and patient group (n=90), respectively (p<0.05). In this study, the HPLC/FLD method showed high sensitivity and reproducibility for a routine clinical laboratory testing. Moreover determination of homocysteine level in plasma might be useful for a biochemical marker for predicting the cardiovascular diseases and for monitoring of therapeutic effect of lowering homocysteine in patients with chronic renal failure.

뮤코펙트 정(염산암브록솔 30mg)에 대한 암브렉트 정의 생물학적 동등성

유정연,정선경,최미희,한상범,이경률,이희주 한국약제학회 2003 Journal of Pharmaceutical Investigation Vol.33 No.3

A bioequivalence study of Ambrect^(™) tablets (Dong Wha Pharm. Ind. Co., Ltd.) to Mucopect^(™) tablets(Boe-hringer Ingelheim Korea, Ltd.) was conducted according to the guideline of Korea Food and Drug Administration (KFDA). Twenty four healthy male Korean volunteers received each medicine at the ambroxol hydorchoride dose of 30 ㎎ in a 2×2 crossover study. There was a one-week wash out period between the doses. Plasma concentrations of ambroxol were monitored by a high-performance liquid chromatography for over a period of 24 hours after the administration. Aug_(t)(the area under the plasma concentration-time curve from time zero to 24 hr) was calculated by the linear trapezoidal rule method. C_(max) (maximum plasma drug concentration) and T_(max) (time to reach C_(max)) were compilied from the plasma concentraction-time data. Analysis of variance was carried out using logarithmically transformed AUC_(T) and C_(max). No significant sequence effect was found for all of the bioavailability parameters indicating that the crossover design was properly performed. The 90% confidence intervals of the AUC_(t) ratio and the C_(max) ratio for Ambrect^(™)/Mucopect^(™) were 0.89-1.01 and 0.89-1.02, respectively. These values were within the acceptable bioequivalence intervals of 0.80-1.25. Thus, our study demonstarated the bioequivalence of Ambrect^(™) and Mucopect^(™) with respect to the rate and extent of absorption.

Measurement of Total Plasma Homocysteine in Patients with chronic Renal Failure Using HPLC/FLD

Lee,Kyung-Ok,Yoo,Jeong-Yeon,Roh,Hyung-Jin,Paik,Man-Jeong,Lee,Kang-Hyeob,Kang,Bo-Kyung,Ryoo,Kwang-Suk THE KOREAN SOCIETY FOR BIOMEDICAL LABORATORY SCIEN 1997 Journal of biomedical laboratory sciences Vol.3 No.1

본 연구에서는 한국인 만성신부전증 환자에서 심혈관계 질환의 조기진단을 위한 생화학적 표지자로서 homocysteine의 임상적 유용성을 검토하기 위하여, 만성신부전증 환자와 건강인에서 HPLC/FLD (high performance liquid chromatography/fluorescence detector)을 이용하여 혈장 homocysteine 농도를 측정하고 그 결과를 비교하였다. 본 실험방법의 회수율은 98.6±5.8%를 나타내었으며, 0.2 nmol/L보다 낮은 농도까지 측정이 가능하였고, 2∼50 nmol/ml까지 직선성이 성립하였다 (correlation coefficient=0.9997). 한국인 중 건강한 정상인 (20명)과 만성신부전증 환자 (90명)에서 혈장 homocysteine은 각각 6.81±1.54 nmol/ml과 27.28±14.94 nmol/ml이었으며, 환자군에서는 정상인군에 비하여 약 4배 정도 높은 수치를 나타내었다 (p<0.05). 본 실험의 결과로 볼 때 HPLC/FLD를 이용한 homocysteine 측정은 예민도와 재현성이 높아 routine 실험실 방법으로 유용성이 높을 것으로 생각되며, 또한 혈장 homocysteine의 측정은 만성신부전증 환자의 주요한 사망원인이 되는 폐쇄성 동맥질환을 조기에 진단하거나, 혹은 homocysteine농도를 저하시키는 치료를 실시한 후 치료효과를 판단하기 위한 생화학적 marker로 활용될 수 있을 것으로 기대된다. Cardiovascular disease has been the leading cause of death among patients with chronic renal failure. Many reports have been described that homocysteine is one of the independent risk factor to the occulsive vascular disease. In this study, HPLC/FLD (high performance liquid chromatography-fluorescence detector) technique was used to measure homocysteine level in patients with chronic renal failure and normal control group. The detection limit and recovery of total plasma homocysteine using HPLC/FLD were 98.6±5.8% and 0.2 nmol/ml, respectively. The linearity of this method was established in concentration range of 2∼50 nmol/ml, (correlation coefficient=0.9997). The concentrations of total plasma homocysteine were 6.81±1.54 nmol/ml and 27.28±14.94 nmol/ml in normal control (n=20) and patient group (n=90), respectively (p<0.05). In this study, the HPLC/FLD method showed high sensitivity and reproducibility for a routine clinical laboratory testing. Moreover determination of homocysteine level in plasma might be useful for a biochemical marker for predicting the cardiovascular diseases and for monitoring of therapeutic effect of lowering homocysteine in patients with chronic renal failure.