• Archives of Pharmacal Research
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• 제24권5호
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• pp.407-411
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• 2001

Reversed-phase high performance liquid chromatographic method was applied for the determination of eleutheroside B and E in the various Acanthopanax species collected In Korea. The stationary phase used was Zorbax 300 SB $C_{18}$ and a mobile phase program was used, which started at 6% acetonitrile for 2 min, and then a linear gradient was operated for the next 18 min to 17% acetonitrile at a flow rate of 1.0 ml/min. The column effluent was monitored at UV 210 nm. Identification was carried out by comparing the retention time and the LC/MS spectrum of each peak corresponding to eleutheroside B and E from sample with those of standards. In general, the contents of eleutheroside B and 1 in stems were higher than those In roots. Acanthopanax species could be classified into two groups based upon the contents of eleutheroside B and E: one group contains no or very little eleutheroside B and another contains both eleutheroside B and E.

• 농약과학회지
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• 제19권3호
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• pp.185-194
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• 2015

본 연구는 대부분의 농작물 중 살균제 carpropamid의 잔류량을 정밀하게 분석할 수 있는 단성분 분석법을 개발하고자 하였다. 대표 농작물로 배추, 사과, 현미, 고추를 선정하였으며, 균질화된 농작물 시료 중 carpropamid 잔류분을 acetone을 이용하여 진탕 추출하고 액-액 분배법과 Florisil 크로마토그래피법을 통해 정제하였다. C8 및 C18 역상컬럼이 장착된 액체크로마토그래피를 이용해 UV 220 nm 파장에서 carpropamid를 정량분석하였으며, 질량분석기를 통해 잔류분을 확인하였다. 본 분석법을 통한 carpropamid의 기기정량한계는 2 ng으로 분석정량한계는 0.02 mg/kg이었다. 표준용액을 3수준 (분석정량한계 ${\times}1$, ${\times}10$, ${\times}100$), 3반복으로 무처리 시료에 첨가하고 본 분석법의 회수율을 산출한 결과 84~112%이었으며, 농산물 종류에 상관없이 반복 간 분석오차는 10% 미만으로 우수한 정밀성을 보였다.

• 한국환경보건학회지
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• 제22권1호
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• pp.36-44
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• 1996

A comparison was made of two detection methods(UV absorbence detection and fluorescence detection with pre-column derivatization, with trifluoroacetic acid) coupled with HPLC for the simultaneous determination of aflatoxin $B_1, B_2, G_1$ and $G_2$. A good separation of the four aflatoxins was achieved on a reversed-phase $C_{18}$ column (30 cm x 3.9 mm) with methanol-acetonitrile-water(20+20+60) for absorbence detection or acetonitrile-water(25+75) for fluorescence detection at the flow rate of 1.0 ml/min. The calibration graphs were linear over the ranges 100 ppb-1 ppm for $B_1/G_1$ and 30~300 ppb for $B_2/G_1$ with absorbence detection, and 1~500 ppb for $B_1/G_1$ and 0.3~150 ppb for $B_2/G_2$ with fluorescence detection. The correlation coefficients were greater than 0.94 and 0.99 for absorbance detection and for fluorescence detection, respectively. The detection limit was 100 ng for $B_1/G_1$ and 30 ng for $B_2/G_2$ with absorbence detection, and 1 ng for $B_1/G_1$ and 0.3 ng for $B_2/G_2$ with fluorescence detection. Recovery rates of aflatoxin $B_1, B_2, G_1$ and $G_2$ added to yeast-extract sucrose broth medium were 66.6%, 59.4%, 67.5% and 59.2%, respectively, for absorbence detection and 82.9%, 71.5%, 80.0% and 69.3%, respectively, for fluorescence detection. The four aflatoxins in culture medium were quantitatively detected by the two methods. The aflatoxins in the rice sample were not detected the absorbence detection method, but were below 10 ppb using the fluorescence detection method. Analysis of aflatoxins by both the absorbence and fluorescence methods coupled with HPLC showed acceptable linearity and good recovery. The absorbence detection was less timeconsuming and safer for treatment. The fluorescence detection was more elective and sensitive though elevated $B_1$ and $G_1$ contents were determined from the TFA-induced conversion of $B_1$ to $B_{2a}$ and $G_1$ to $G_{2a}$.

• KSBB Journal
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• 제15권3호
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• pp.238-242
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• 2000

Enterokinase에 의한 G3-IL-2 가수분해 반응에 있어서의 urea 는 글루카곤과 IL-2를 분리하고자 하는 데에 펼요한 절단 부위 가 잘 노출되도록 도움을 주는 역할을 하는데 1.0 M이상의 높 은 농도에서 오히려 원하는 단백질의 변성에 영향을 미침을 알 수 있었다, 그리고 효소 반응 시에 효소의 활성에 도움을 주는 첨가제는 반응 후에 침전이 생기고, IL-2의 회수율에는 오히려 나쁜 영향을 주었다. 그리고 반응시간에 따른 반응의 효과는 24 시간 이후에는 효소에 의한 가수분해 반응이 진행되지 않음이 관찰되었다. 가수분해 반응 후의 순수한 IL-2의 회수율은 약 1 5 5~35% 정도였고, 반응 조건에 따라 수융은 차이가 있었다. IL-2는 시간이 지남에 따라 분자 상호 간의 응집에 의해 oligomer의 형태가 되어 본래의 크기보다 더 커져 RP-HPLC에서 더 빨리 용리되는 결과를 얻을 수 있었다.

• Asian Journal of Atmospheric Environment
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• 제11권4호
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• pp.283-299
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• 2017

An analytical method using high-performance liquid chromatography (HPLC) with fluorescence (FL) detection was developed for simultaneously analyzing 10 polycyclic aromatic hydrocarbons (PAHs) and 18 nitro-derivatives of PAHs (NPAHs). The two-dimensional HPLC system consists of an on-line clean-up and reduction for NPAHs in the 1st dimension, and separation of the PAHs and the reduced NPAHs and their FL detection in the 2nd dimension after column-switching. To identify an ideal clean-up column for removing sample matrix that may interfere with detection of the analytes, the characteristics of 8 reversed-phase columns were evaluated. The nitrophenylethyl (NPE)-bonded silica column was selected because of its shorter elution band and larger retention factors of the analytes due to strong dipole-dipole interactions. The amino-substituted PAHs (reduced NPAHs), PAHs and deuterated internal standards were separated on polymeric octadecyl-bonded silica (ODS) columns and by dual-channel detection within 120 min including clean-up and reduction steps. The limits of detection were 0.1-9.2 pg per injection for PAHs and 0.1-140 pg per injection for NPAHs. For validation, the method was applied to analyze crude extracts of fine particulate matter ($PM_{2.5}$) samples and achieved good analytical precision and accuracy. Moreover, the standard reference material (SRM1649b, urban dust) was analyzed by this method and the observed concentrations of PAHs and NPAHs were similar to those in previous reports. Thus, the method developed here-in has the potential to become a standard HPLC-based method, especially for NPAHs.

• Bulletin of the Korean Chemical Society
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• 제35권7호
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• pp.1956-1964
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• 2014

To provide the scientific corroboration of the traditional uses of Akebia quinata (Thunb.) Decne., a detailed analytical examination of A. quinata stems was carried out using a reversed-phase high performance liquid chromatography (RP-HPLC) method coupled to photodiode array detector (PDA) for the simultaneous determination of four phenolic substances; cuneataside D (1), 2-(3,4-dihydroxyphenyl)ethyl-O-${\beta}$-D-glucopyranoside (2), 3-caffeoylquinic acid (3) and calceolarioside B (4). Particular attention was focused on the main compound, 3-caffeoylquinic acid (3), which has a range of biological functions. In addition, 2-(3,4-dihydroxyphenyl)ethyl-O-${\beta}$-D-glucopyranoside (2) was considered as a discernible marker of A. quinata from its easy confuse plants. The contents of compounds 2 and 3 ranged from 0.72 to 2.68 mg/g and from 1.66 to 5.64 mg/g, respectively. The validation data indicated that this HPLC/PDA assay was used successfully to quantify the four phenolic compounds in A. quinata from different locations using relatively simple conditions and procedures. The pattern-recognition analysis data from 53 samples classified them into two groups, allowing discrimination between A. quinata and comparable herbs. The results suggest that the established HPLC/PDA method is suitable for quantitation and pattern-recognition analyses for a quality evaluation of this medicinal herb.

• 한국식품과학회지
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• 제37권6호
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• pp.1024-1027
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• 2005

본 연구에서는 성장기용 조제식 중에 영양강화를 위해 첨가하는 비타민 $D_3$와 $K_1$의 함량측정을 위해 lipase를 이용하여 효소 가수분해 후 유기용매로 비타민을 추출하여 동시에 분석하는 신속분석법을 위와 같이 수행하였다. 추출된 비타민을 전처리 컬럼에서 2번의 switching time을 설정하여 농축컬럼에 홉착시킨 후 gradient mode로 2가지 이동상으로 분석컬럼에서 각각의 성분을 모두 분리하여 동시에 검출하는 방법을 사용하였다. 시료로 사용된 성장기용 조제식은 표기함량보다 다소 높게 분석되었으나, 국제표준인증물질을 시료로 사용하여 본 연구의 실험방법에 의해 측정된 값은 인증된 표준값내의 결과를 보여주었다. 따라서, 비타민 $D_3$ 또는 $K_1$을 강화한 분유, 이유식 등의 분말 유제품 중에서 함량을 측정하고자 할 때 한정된 장비와 인력으로 각각의 2가지 실험방법을 수행하기가 어렵거나 시간단축이 필요한 경우, 본 연구에서 수행한 실험방법과 같이 시료전처리를 간단하고 신속하게 수행할 뿐만 아니라 역상컬럼과 column-switching HPLC에 의해 비타민 $D_3$ 또는 $K_1$을 동시에 분석함으로써 보다 효율적인 분석을 진행 할 수 있을 것으로 사료된다.

• Archives of Pharmacal Research
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• 제29권11호
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• pp.1049-1054
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• 2006

Activation of Sphingosine kinase (Sphk) increases a bioactive lipid, sphingosine 1-phosphate (S1P) and has been observed in a variety of cancer cells. Therefore, inhibition of Sphk activity was an important target for the development of anticancer drugs. As a searching tool for Sphk inhibitor, we developed fluorescent Sphk activity assay combined with high performance liquid chromatography (HPLC). Previously we established murine teraticarcinoma mutant F9-12 cells which lack S1P lyase and stably express Sphk1. By using F9-12 cells, optimal assay conditions were established as follows; $100\;{\mu}M\;of\;C_{17}-Sph\;and\;30\;{\mu}g$ protein of F9-12 cells lysate in 20 min. Sphingosine analog $C_{17}-Sph$ was efficiently phosphorylated by Sphk activity ($K_{m}:67.08\;{\mu}M,\;V_{max}\;:1507.5\;pmol/min/mg$). New product $C_{17}-S1P$ was separated from S1P in reversed-phase HPLC. In optimized conditions, 300 nM of phorbol 12-myristate 13-acetate (PMA) increased Sphk activity approximately twice while $20\;{\mu}M$ of N,N-dimethylsphingosine (DMS) reduced 70% of Sphk activity in F9-12 cells lysate. In conclusion, we established non-radioactive but convenient Sphk assay system by using HPLC and F9-12 cells.

• Journal of Ginseng Research
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• 제43권1호
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• pp.27-37
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• 2019

Background: The structural conversions in ginsenosides induced by steaming or heating or acidic condition could improve red ginseng bioactivities significantly. In this paper, the chemical transformations of red American ginseng from fresh Panax quinquefolium L. under steaming were investigated, and the possible mechanisms were discussed. Methods: A method with reversed-phase high-performance liquid chromatography coupled with linear ion trap mass spectrometry ($HPLC-MS^n$)-equipped electrospray ionization ion source was developed for structural analysis and quantitation of ginsenosides in dried and red American ginseng. Results: In total, 59 ginsenosides of protopanaxadiol, protopanaxatriol, oleanane, and ocotillol types were identified in American ginseng before and after steaming process by matching the molecular weight and/or comparing $MS^n$ fragmentation with that of standards and/or known published compounds, and some of them were determined to be disappeared or newly generated under different steaming time and temperature. The specific fragments of each aglycone-type ginsenosides were determined as well as aglycone hydrated and dehydrated ones. The mechanisms were deduced as hydrolysis, hydration, dehydration, and isomerization of neutral and acidic ginsenosides. Furthermore, the relative peak areas of detected compounds were calculated based on peak areas ratio. Conclusion: The multicomponent assessment of American ginseng was conducted by $HPLC-MS^n$. The result is expected to provide possibility for holistic evaluation of the processing procedures of red American ginseng and a scientific basis for the usage of American ginseng in prescription.

• 분석과학
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• 제21권4호
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• pp.245-258
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• 2008

본 연구에서는 하고초의 지표성분인 triterpenic acids 5종을 컬럼 크로마토그래피와 역상 HPLC를 이용하여 추출 및 분리했고, 이들 성분의 순도는 90% 이상임을 HPLC를 이용하여 확인했다. 고속원자충돌 이온화법-고분해능 질량분석기(FAB-HRMS)를 사용하여 지표성분의 분자량 및 원소조성을 결정했으며, 지표성분의 구조 분석은 FAB-MS/MS 의해 음이온 및 양이온 모드에서 수행하였다. Triterpenic acid류의 충돌유발분해(collision-induced dissociation, CID) 탄뎀질량분석(MS/MS) 스펙트럼에서 protonated molecule인 $[M+H]^+$ 및 deprotonated molecule인 $[M-H]^-$ 이온의 CID는 주로 retro Diels-Alder (RDA), 탈수 (dehydration) 및 탈탄산(decarboxylation) 반응에 의한 다양한 생성이온들이 나타났다. 특히, $[M-H]^-$이온의 CID-MS/MS 스펙트럼에서는 charge-remote fragmentation (CRF) 현상에 의한 이온들도 특성이온으로 나타났다. 이들 CID-MS/MS 스펙트럼의 해석을 통하여 하고초의 지표성분인 triterpenic acids의 구조 규명을 수행하였다.