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태국칡(Pueraria mirifica)으로부터 norsesquiterpene의 분리 및 동정
권정화 ( Jung Hwa Kwon ),조진경 ( Jin Gyeong Cho ),박희정 ( Hee Jung Park ),허규원 ( Gyu Won Huh ),방면호 ( Myun Ho Bang ),한민우 ( Min Woo Han ),오창환 ( Chang Hwan Oh ),고성권 ( Sung Kwon Ko ),조수열 ( Soo Yeul Cho ),최갑용 ( Ka 한국응용생명화학회 2014 Journal of Applied Biological Chemistry (J. Appl. Vol.57 No.4
The roots of Pueraria mirifica were extracted with 70% aqueous ethyl alcohol and partitioned into ethyl acetate (EtOAc), n-butyl alcohol (BuOH), and H2O fractions, successively. From the EtOAc fraction, four norsesquiterpenes were isolated through the repeated silica gel, octadecyl silica gel and Sephadex LH-20 column chromatographies. On the basis of physicochemical and spectroscopic data including nuclear magnetic resonance (NMR), mass spectrometry, and infrared spectroscopy, the chemical structures were identified as megastigm-5-en-3,9-diol (1), linarionoside B (2), 3,5,6,9-tetrahydroxymegastigm-7-ene (3) and 3,4,9-trihydroxymegastigma-5,7-diene (4). Especially, the configuration of the anomer hydroxyl group was determined as a from the coupling constants of the anomer proton (J =8.0 Hz) in the 1H-NMR spectrum. These compounds were isolated for the first time from the roots of P. mirifica in this study.
식용식물자원으로부터 활성물질의 탐색-XXII. 사자발쑥 (Artemisia princeps PAMPANINI)의 지상부로부터 Triterpenoid의 분리
방면호 ( Myun Ho Bang ),조진경 ( Jin Gyeong Cho ),송명종 ( Myoung Chong Song ),이대영 ( Dae Young Lee ),한민우 ( Min Woo Han ),정해곤 ( Hae Gon Chung ),정태숙 ( Tae Sook Jeong ),이경태 ( Kyung Tae Lee ),최명숙 ( Myung Sook Choi 한국응용생명화학회(구 한국농화학회) 2008 Applied Biological Chemistry (Appl Biol Chem) Vol.51 No.3
팽화 홍삼으로부터 20(S)-Ginsenoside Rg3와 Rg5의 분리 및 구조동정
안영은 ( Young Eun An ),조진경 ( Jin Gyeong Cho ),백남인 ( Nam In Baik ),최성원 ( Sung Won Choi ),허남윤 ( Nam Yoon Hur ),박석준 ( Seok Jun Park ),김병용 ( Byung Yong Kim ),백무열 ( Moo Yeol Baik ) 한국산업식품공학회 2010 산업 식품공학 Vol.14 No.2
Red ginseng tail roots (9.8g water/100g sample) were puffed at 7, 8, 9, and 10 kgf/cm2 using a rotational puffing gun. Puffed red ginseng was extracted with 70% ethanol, and the concentrated extract was successively partitioned with diethyl ether, n-butanol and H2O. Two unknown ginsenosides from puffed red ginseng were found at 63 and 65 min of retention time in HPLC chromatogram suggesting that chemical structure of some ginsenosides might be altered during the puffing process. Identification of two unknown compounds was carried out using TLC, HPLC and NMR. Two major compounds were isolated from TLC. According to TLC result, compound I was expected to be the mixture of ginsenosides Rk1 and Rg5, and compound II was expected to be a 20(S)-ginsenoside Rg3. Three compounds were isolated from n-butanol fraction through repeated silica gel and octadecyl silica gel column chromatographies. From the result of 1H- and 13C-NMR data, the chemical structures of unknown compounds were determined as ginsenoside Rg5 and 20(S)-ginsenoside Rg3. Unfortunately, ginsenoside Rk1 could not be separated from ginsenoside-Rg5 in the compound I. It was carefully reexamined using HPLC and confirmed that the last unknown compound was ginsenoside-Rk1.
이대영(Dae-Young Lee),조진경(Jin-Gyeong Cho),이민경(Min-Kyung Lee),이재웅(Jae-Woong Lee),박희정(Hee-Jeong Park),이윤형(Youn-Hyung Lee),양덕춘(Deok-Chun Yang),백남인(Nam-In Baek) 고려인삼학회 2008 Journal of Ginseng Research Vol.32 No.4
수삼으로부터 용매추출, 용매분획 및 silica gel column chromatography를 반복하여 ginsenoside Rg₁을 분리하였다. Ginsenoside Rg₁의 결정특성, 녹는점, 비선광도, IR 데이터, FAB/MS 데이터, TLC에서의 Rf 값, HPLC에서의 r.t. 및 NMR 데이터를 표준화한 조건으로 측정하여 문헌 값과 비교 고찰하였다. 특히 ginsenoside Rg₁의 ¹H- 및 <SUP>13</SUP>C-NMR 데이터를 HSQC 및 HMBC와 같은 2D-NMR 실험을 통하여 정확하게 동정하였다. The fresh ginseng roots were extracted in aqueous methanol (MeOH), and the obtained extracts were partitioned using ethyl acetate (EtOA), n-butanol (n-BuOH), and water, successively. The repeated silica gel column chromatography for n-BuOH fraction afforded a purified ginsenoside Rg₁ The physico-chemical, spectroscopic and chromatographic data of ginsenoside Rg₁ such as crystallization characteristics, melting point, specific rotation, infrared spectrometry (IR) data, fast atom bombardment/mass spectrometry (FAB/MS) data, nuclear magnetic resonance (NMR) data, retention factor (Rf) in thin layer chromatography (TLC) experiment, and retention time (r.t.) in HPLC analysis, were measured and compared with those reported in literatures. Especially, the previous literatures reported different data for ginsenoside Rg₁ in the ¹H- and <SUP>13</SUP>C-NMR experiments. This paper gives the exactly assigned NMR data through 2D-NMR experiments, such as ¹H-¹H correlation spectroscopy (COSY), hetero nuclear single quantum correlation (HSQC), and hetero nuclear multiple bond connectivity (HMBC).
순무(Brassica rapa ssp.) 뿌리로부터 flavonoid의 분리 및 동정
정락훈 ( Rak Hun Jeong ),( Qian Wu ),조진경 ( Jin Gyeong Cho ),이대영 ( Dae Young Lee ),( Sabina Shrestha ),이민호 ( Min Ho Lee ),이경태 ( Kyung Tae Lee ),최명숙 ( Myung Sook Choi ),정태숙 ( Tae Sook Jeong ),안은미 ( Eun Mi 한국응용생명화학회 2013 Journal of Applied Biological Chemistry (J. Appl. Vol.56 No.1
The roots of Brassica rapa ssp. were extracted with 95% aqueous ethanol and the concentrated extracts were partitioned using ethyl acetate (EtOAc), n-butyl alcohol and H2O, successively. From the EtOAc fraction, five flavonoids were isolated through repeated silica gel and ℃tadecyl silica gel (ODS) column chromatography (c.c.). Based on NMR, mass spectrometry (MS) and IR spectroscopic data, the chemical structures of the compounds were determined to be lic℃halcone A (1), 4,4`- dihydroxy-3`-methoxychalcone (2), liquirtigenin (3), liquiritin (4), and isoliquiritin (5). This is the first report of these compounds isolated from the root of this plant.
천연물 / 유기화학 : 생강나무(Lindera obtusiloba Blume) 목부로부터 Flavonoid 및 Lignan 화합물의 분리
서경화 ( Kyeong Hwa Seo ),백미영 ( Mi Young Baek ),이대영 ( Dae Young Lee ),조진경 ( Jin Gyeong Cho ),강희철 ( Hee Cheol Kang ),안은미 ( Eun Mi Ahn ),백남인 ( Nam In Baek ),이윤형 ( Youn Hyung Lee ) 한국응용생명화학회 2011 Journal of Applied Biological Chemistry (J. Appl. Vol.54 No.3
The stem woods of Lindera obtusiloba Blume were extracted in 80% aqueous methanol and the concentrated extract was partitioned with ethyl acetate (EtOAc), butanol (n-BuOH), and H2O, successively. From the EtOAc and n-BuOH fractions, five compounds were isolated through the repeated silica gel, octadecyl silica gel, and Sephadex LH-20 column chromatographies. On the basis of spectroscopic data including mass spectrometry, IR, 1H-NMR, 13C-NMR, distortionless enhancement by polarization transfer, and two-dimensional-NMR gradient correlated spectroscopy (gCOSY), gradient heteronuclear single quantum correlation (gHSQC), gradient heteronuclear multiple bonding connectivity (gHMBC), the chemical structures of the compounds were determined as asarinin (1), (+)-catechin (2), (-)-epicatechin (3), hyperin (4), and nudiposide (5). Compounds 1 and 5 were isolated for the first time from the stem wood of L. obtusiloba Blume.