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Flavonoid Glycosides from Cowpea Seeds (Vigna sinensis K.) Inhibit LDL Oxidation
En-Ji Cui,송나영,Sabina Shrestha,정인식,김지영,정태숙,백남인 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.2
Six flavonoid glycosides were isolated from the n-butanol fraction of cowpea seeds (Vigna sinensis K.)through silica gel (SiO2) and octadecyl silica gel (ODS)column chromatographies. Based on their chemical structures determined via interpretation of spectroscopic data including NMR, MS, and IR, the compounds were identified as kaempferol 3-O-β-D-sophoroside (1), quercetin 3-O-β-Dsophoroside (2), isoquercitrin (3), hyperin (4), catechin 7-O-β-D-glucopyranoside (5), and quercetin 3-O-β-Dglucopyranosyl(1→6)-O-β-D-galactopyranoside (6). This is the first report of the isolation of these flavonoids from this plant. Among these flavonoids, compound 2, 5, and 6significantly inhibited LDL oxidation exhibiting 96.0±0.1(IC50: 3.9 μM), 96.8±1.7 (IC50: 2.9 μM), and 97.4±0.1%(IC50: 3.5 μM) inhibition, respectively, at a concentration of 40 μM.
Isolation of Sterols from Cowpea (Vigna sinensis) Seeds and Their Promotion Activity on HO-1
( En Ji Cui ),( Ji Hae Park ),( Hee Jung Park ),( In Sik Chung ),( Ji Young Kim ),( Seung Woo Yeon ),( Nam In Baek ) 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.3
Cowpea (Vigna sinensis K.) seeds were extracted with 80% aqueous methanol. Concentrated extracts were partitioned with ethyl acetate, butanol, and H2O, successively. The repeated silica gel and octadecyl silica gel (ODS) column chromatographic separations for the butanol fraction led to isolation of four sterols, whose chemical structures were determined as 7β-hydroxysitosterol (1), 7α-hydroxysitosterol (2), 7-ketositosterol (3), and stigmasterol 3-O-β -D-glucopyranoside (4) from the interpretation of spectroscopic data including NMR, mass spectroscopy, and infrared spectroscopy (IR). This paper reports the first isolation of compounds 1 and 2 from V. sinensis seeds. All compounds were evaluated for the effect on heme oxygenase-1 (HO-1) expression, which is considered to be an antioxidant enzyme that catabolizes heme into carbon monoxide, free iron, and biliverdin. All sterols increased the expression of HO-1 in HepG2 cells.
Cui, Xu,Shih, En-Min,Jauregui, Luis A.,Chae, Sang Hoon,Kim, Young Duck,Li, Baichang,Seo, Dongjea,Pistunova, Kateryna,Yin, Jun,Park, Ji-Hoon,Choi, Heon-Jin,Lee, Young Hee,Watanabe, Kenji,Taniguchi, Tak American Chemical Society 2017 NANO LETTERS Vol.17 No.8
<P>Monolayer MoS2, among many other transition metal dichalcogenides, holds great promise for future applications in nanoelectronics and optoelectronics due to its ultrathin nature, flexibility, sizable band gap, and unique spin valley coupled physics. However, careful study of these properties at low temperature has been hindered by an inability to achieve low-temperature Ohmic contacts to monolayer MoS2, particularly at low carrier densities. In this work, we report a new contact scheme that utilizes cobalt (Co) with a monolayer of hexagonal boron nitride (h-BN) that has the following two functions: modifies the work function of Co and acts as a tunneling barrier. We measure a flat-band Schottky barrier of 16 meV, which makes thin tunnel barriers upon doping the channels, and thus achieve low-T contact resistance of 3 k Omega.mu m at a carrier density of 5.3 x 10(12)/cm(2). This further allows us to observe Shubnikov-de Haas oscillations in monolayer MoS2 at much lower carrier densities compared to previous work.</P>
Anti-inflammatory Effects of Cowpea (Vigna sinensis K.) Seed Extracts and Its Bioactive Compounds
이상민,이태훈,En-Ji Cui,Nam-In Baek,Seong Gil Hong,정인식,김지영 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.5
Anti-inflammatory effects of methanol extract and solvent fractions of cowpea (Vigna sinensis K.; VS) seeds and the isolated compounds were evaluated. Ethyl acetate and n-butanol fractions of VS seeds were found to strongly inhibit nitric oxide (NO) production, and inducible nitric oxide synthase (iNOS) mRNA and protein expressions in lipopolysaccharides (LPS)-stimulated RAW264.7 macrophage cells. Compounds inhibiting NO production in RAW264.7 cells were isolated and identified via successive partitioning and spectroscopic characterization. The active compounds included oleanolic acid, linolenic acid (LnA), linoleic acid (LA), 7-ketositosterol,stigmasterol-glucose (glc), and soyasaponin 1. Among the isolated compounds, LnA and LA were found to inhibit NO production significantly. Contents of LnA and LA in VS seeds were 2.034 and 1.162 mg/g on dry weight basis, respectively. Reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blot analysis show inhibitory effects of these compounds. LnA and LA repressed mRNA and protein levels of iNOS in LPS-stimulated cells. LA suppressed the production of pro-inflammatory cytokines such as interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α in LPS-induced macrophage cells. Thus, VS was found to exhibit strong antiinflammatory activity, which may be partly attributed to the polyunsaturated fatty acids such as LnA and LA.
( Sabina Shrestha ),( Ji Hae Park ),( Dae Young Lee ),( Jin Gyeong Cho ),( En Ji Cui ),( In Sik Chung ),( Byoung Mog Kwon ),( Moon Hee Cho ),( Tae Sook Jeong ),( Nam In Baek ) 한국응용생명화학회(구 한국농화학회) 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.2
A new xanthene was isolated from the methanolic extract of Desmostachya bipinnnata through repeated silica gel and octadecyl silica gel column chromatographies. Based on spectroscopic data including nuclear magnetic resonance, fast atom bombardment mass spectrometry, and infrared spectroscopy, chemical structure of the compound was determined to be 2,6-dihydroxy-7-methoxy- 3H-xanthen-3-one. The compound exhibited inhibitions of signal transducer and activator of transcription 3-dependent luciferase activity in HCT-116 colon cancer cell line with IC50 value of 5μM and low-density lipoprotein-oxidation with IC50 value of 27.2 μM.