• Title/Summary/Keyword: EI/MS

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A study on the derivatization technique for tamoxifen metabolites in human urine by gas chromatography/mass spectrometry (기체크로마토그래피/질량분석기를 이용한 인체 내 뇨시료에서의 Tamoxifen 대사체 검출을 위한 유도체화 연구)

  • Kim, Yunje;Lee, Yoonjung
    • Analytical Science and Technology
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    • v.17 no.4
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    • pp.322-336
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    • 2004
  • The improved derivatization technique of tamoxifen metabolite in human urine is described for the acylation method that they are substituted by derivatization reagent like acyl anhydride for use of gas chromatography/mass spectrometry. The hydroxyl group of tamoxifen metabolite was derivatized by trifluoroacetic anhydride (TFAA), pentafluoroacetic anhydride (PFPA) and heptaflorobutylic anhydride (HFBA). It was investigated to the gas chromatography/mass spectrometry (GC/MS) technique use negative ion chemical ionization (NCI), positive ion chemical ionization (PCI) and electron impact (EI). In acylation of the metabolites of tamoxifen, the effective reaction temperature and time were shown to be at $50^{\circ}C$ for 30 min. The 4-hydroxytamoxifen, which is known to major metabolite of tamoxifen, was not detected in human urine, whileas the hydroxymethoxytamoxifen was detected. We thought that this result was from the single dose of tamoxifen.

Studies on Biological Activity of Wood Extractives(II) - Antimicrobial and antioxidative compound isolated from heartwood of Zelkova serrata - (수목추출물의 생리활성에 관한 연구(II) -느티나무 심재의 항균 및 항산화물질-)

  • Lee, Sung-Suk;Choi, Don-Ha;Lee, Hak-Ju;Kang, Ha-Young
    • Journal of the Korean Wood Science and Technology
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    • v.28 no.2
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    • pp.32-41
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    • 2000
  • Antimicrobial and antioxidative activities on heartwood extractives from Zelkova serrata were investigated to develop a natural fungicide or preservative. The ethanol extract from Z. serrata was fractionated in the order of petroleum ether, diethylether and ethylacetate to determine antimicrobial activity. The highest antimicrobial activity against the tested microorganisms was found in the petroleum ether soluble fraction. An active antimicrobial compound was isolated from petroleum ether soluble fraction, and identified as 7-hydroxy-3-methoxycadalene by $^1H$-, $^{13}C$-NMR and EI-MS spectrometry. This compound showed higher antifungal activity, but lower antibacterial activity than hinokitiol(${\beta}$-thujaplicin), strong antimicrobial compound isolated from Thujopsis dolabrata. Antioxidative activity was also higher than ${\alpha}$-tocopherol and similar to BHT(butylated hydroxytoluene), one of the strongest synthetic antioxidant. As a result, it was concluded that 7-hydroxy-3-methoxycadalene isolated from Z. serrata had strong antifungal and antioxidative activities.

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Isolation and Identification of Antimicrobial Active Substances from Rhodiola sachlinensis (홍경천(Rhodiola sachlinensis)에서 항균성 물질의 분리 및 동정)

  • 심창주;이규희;정재홍;이상덕;김영호;오만진
    • Food Science and Preservation
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    • v.11 no.1
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    • pp.63-70
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    • 2004
  • The antimicrobial substances from Rhodiola sachalinensis were extncted, isolated and identified. The highest level of antimicrobial activity and its yield were obtained in methanol extract. The minimum inhibition concentrations of the methanol extract were 500 $\mu\textrm{g}$mL on agar plate and 100 $\mu\textrm{g}$mL in broth media for four gram positive and four gram negative microbials. The methanol extract was fractionated by n-hexane, chloroform, ethyl ether, ethyl acetate, and butanol, orderly. The separate was developed on the TLC plate with different solvent system ratio of chloroform and methanol. Nine substances were isolated from chloroform and methanol mixture(9:1, v/v). Among them, three isolates showed antimicrobial activity. Three substances separated by HPLC were identified by GC/MS(EI) spectrum and $^1$H, /sup13/C-NMR spectrum. They were gallic acid, (-)-epicatechin and kaempferol. The antimicrobial activities of each substances were shown gallic acid, (-)-epicatechin, kaempferol orderly.

Structures and some Properties of the Antimicrobial Compounds in the Red Alga, Symphyocladia latiuscula (참보라색우무에서 추출한 항균물질의 구조 및 특성)

  • LIM Chi-Won;LEE Jong-Soo;CHO Young-Je
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.33 no.4
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    • pp.280-287
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    • 2000
  • Three antimicrobial compounds (SL-l, SL-2 and SL-3) were isolated and identified from the marine red alga, Symphyocladia latiuscula. In addition, their biological functionalities such as cytotoxicity and desmutagenic activity were investigated. From the cryophyllized S. JatiuscuJa, SL-l, SL-2 and SL-3 were purified by solvent extractions and HPLC.SL-2 was crystallized in benzene-diethyl ether solvent. On the EI-MS spectra, it was found that they had three bromines in their structure which showed typical signal strength ratios at $M^+, [M+2]^+, [M+4]^+, [M+6]^+ (13: 38: 37: 12)$. $SL-l$ was identified as 2,3,6-tribromo-4,5-dihydroxybenzyl alcohol ($C_8H_7Br_3O_3, MW=374$) by NMR and MS spectra. SL-2 was assigned as 2,3,6-tribromo-4,5-dihydroxybenzyl methyl ether ($C_8H_7Br_3O_3, MW=388$) and confirmed by X-ray crystallographic analysis. SL-3 was presumed as an isomer of SL-2. Methanol extract of the S. latiuscula showed antimicrobial activities against all strains tested (bacteria, 15 strains; yeasts, 17 strains; fungi, 4 strains), much or less. The strongest inhibition activity of the methanol extract was to the Vibrio mimicus ($50 {\mu}g/ml$) and V. vulnificus ($50 {\mu}g/ml$). The mice injected intraperitoneally with 3 mg of SL-l and 5 mg of 5L-2 showed no acute toxicity response. SL-2 showed higher desmutagenic activity than SL-l against PhIP and MeIQx.

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The study on the measurement of volatile organic compounds in the air of A and B industrial area (모 공단 대기 중 휘발성 유기화합물 측정에 관한 연구)

  • Shin, Ho-Sang;Ahn, Hye-Sil
    • Analytical Science and Technology
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    • v.17 no.2
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    • pp.130-144
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    • 2004
  • Recently, the air pollution in A and B industrial area has become one of the most important issues, then 60 VOCs in the area were measured using a highly sensitive method. The VOCs were adsorbed onto Carbotrap using air sampler and subsequently desorbed by a thermal desorber system into gas chromatograph-mass spectrometry (TDS-GC-MS). The peaks of all compounds had good chromatographic properties and offered very sensitive response for the EI-MS (SIM). Method detection limits (MDL) ranged from 0.01 to 0.1 ppt(v/v), and linearities of calibration curves were over 0.995. We analyzed total 90 atmosphere air samples of A and B industrial complex using the method. Benzene, toluene, ethylbenzene, xylene, n-hexane, fluorotrichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1,1-trichloroethane, trichloroethylene, tetrachloroethylene, styrene, 1,3,5-trimethylbenzene, 1,2,4-trimethylbenzene, sec-butylbenzene and naphthalen were identified as the major compounds in the air, and their average concentrations were 0.81, 5.02 1.30, 3.0, 0.81, 37.9, 0.07, 0.15, 0.15, 0.79, 0.06, 0.33, 0.03, 0.12, 0.23, and 0.35 ppb(v/v), respectively. The concentrations of VOCs were low in summer and high in fall or winter. When the concentrations detected in air compare with WHO's norm, no case exceed it.

A Study on the Extractives of Domestic Major Softwood Needles (II) - Antioxidant Activity of the Extractives from the Needles of Chamaecyparis pisifera (Sieb. et Zucc.) Endlicher - (국내산 주요 침엽수 잎의 추출성분 (II) - 화백나무 (Chamaecyparis pisifera (Sieb. et Zucc.) Endlicher)잎 추출성분 및 항산화 활성 -)

  • Lee, Sang-Keug;Bae, Young-Soo
    • Journal of the Korean Wood Science and Technology
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    • v.34 no.4
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    • pp.76-82
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    • 2006
  • The dried ground needles (2.0 kg) of Chamaecyparis pisifera (Sieb. et Zucc.) Endlicher were extracted with acetone-$H_2O$ (7:3, v/v), concentrated, and fractionated with a series of n-hexane, methylene chloride, ethyl acetate and water on a separation funnel. Each fraction was freeze dried, then a portion of ethyl acetate soluble powder was chromatographed on a Sephadex LH-20 column using a series of aqueous methanol and ethanol-n-hexane mixture as eluents. The isolated compounds were identified by cellulose TLC, $^1H$-, $^{13}C$-NMR, COSY, HETCOR, FAB and EI-MS. (+)-catechin, taxifolin-3-O-${\beta}$-D-xylopyrano-side, quercetin-3-O-${\alpha}$-L-rhamnopyranoside were isolated from the ethyl acetate soluble fraction of Chamaecypairs pisifera needle. Antioxidative tests on the isolated compounds indicated that all of the compounds showed similar values to ${\alpha}$-tocopherol and BHT as controls.

The study on photoreflectance characteristics of the $Al_xGa_{1-x}As$ epilayer grown by MBE method (MBE 법으로 성장시킨 $Al_xGa_{1-x}As$ 에피층의 Photoreflectance 특성에 관한 연구)

  • 이정렬;김인수;손정식;김동렬;배인호;김대년
    • Journal of the Korean Vacuum Society
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    • v.7 no.4
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    • pp.341-347
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    • 1998
  • We analyzed photoreflectance (PR) characterization of the $Al_xGa_{1-x}As$ epilayer grown by molecular beam epitaxy (MBE) method. The band-gap energy $(E_0)$ satisfying low power Franx-Keldysh (LPFK) due to GaAs buffer layer is 1.415 eV, interface electricall field $(E_i)$ is 1.05$\times$$10^4$V/cm, carrier concentration (N) is $1.3{\times}10^{15}\textrm{cm}^{-3}$. In PR spectrum intensity analysis at 300 K the $A^*$ peak below $(E_0)$ signal is low and distorted because of residual impurity in sample growth. The trap characteristic time ${\tau}_i$ of GaAs buffer layer is about 0.086 ms, and two superposed PR signal near 1.42eV consist of the third derivative signal of chemically eteched GaAs substrate and Franz-Keldysh oscillation (FKO) signal due to GaAs buffer layer.

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Extractives from the Allium victorials (산마늘(Allium victorialis)의 추출성분)

  • Lee, Hak-Ju;Lee, Sang-Keug;Choi, Yun-Jeong;Jo, Hyun-Jin;Kang, Ha-Young;Lee, Sung-Suk;Choi, Don-Ha
    • Journal of Korean Society of Forest Science
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    • v.96 no.6
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    • pp.620-624
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    • 2007
  • Allium victorials var. platyphyllum were ground, extracted with 95% EtOH, concentrated, and fractionated with a series of n-hexane, methylene chloride, ethyl acetate, butanol and water on a separatory funnel. A portion of ethyl acetate soluble fraction was chromatographed on a Sephadex LH-20 and silica gel column using various solvent system as eluents. The isolated compounds were identified by TLC, $^1H-$, $^{13}C$-NMR, HMBC and EI-MS. Astragalin (compound 1), kaempferol (compound 2), quercetin (compound 3), ferulic acid (compound 4) were isolated from the ethyl acetate soluble fraction of A. victorials.

Isolation and Identification of Lipids from the Fruits of Acanthopanax sessiliflorus (오가피(Acanthopanax sessiliflorus Seeman) 열매로부터 지질 화합물의 분리 및 동정)

  • Kim, Su-Yeon;Lee, Dae-Young;Seo, Kyeong-Hwa;Rho, Young-Deok;Kim, Gye-Won;Cheoi, Dae-Sung;Baek, Nam-In
    • Journal of Applied Biological Chemistry
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    • v.55 no.2
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    • pp.103-107
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    • 2012
  • Acanthopanax sessiliflorus Seeman fruits (Araliaceae) were extracted at room temperature with 70% aqueous ethanol (EtOH). The concentrated extract was partitioned with ethyl acetate (EtOAc), n-butyl alcohol, and $H_2O$, successively. From the EtOAc fraction, four compounds were isolated through the repeated silica gel and octadecyl silica gel (ODS) column chromatographies. According to the results of physico-chemical and spectroscopic data including NMR, IR, and gas chromatography/mass spectrometer, the chemical structures of the compounds were determined as stigmasterol (1), linoleic acid (2), ${\beta}$-sitosterol (3), and stigmast-5-en-$3{\beta}$,$7{\beta}$-diol (4).

Falcarindiol, a Polyacetylenic Compound Isolated from Peucedanum japonicum, Inhibits Mammalian DNA Topoisomerase I

  • Lee, Gwang;Park, Hyoung-Gun;Choi, Mi-Lim;Kim, Young-Ho;Park, Yong-Bok;Song, Kyung-Sik;Cheong, Chaejoon;Bae, Young-Seuk
    • Journal of Microbiology and Biotechnology
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    • v.10 no.3
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    • pp.394-398
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    • 2000
  • A methanol extract of the root of Peucedanum japonicum, used as a medicinal herb, showed an inhibitory effect on mammalian topoisomerase I activity. The methanol extract was suspended in ethyl acetate, and a topoisomerase I inhibitor in the organic soluble fraction was then isolated by silica gel and thin layer chromatography. The topoisomerase I inhibitory compound was indentified as falcarindiol based on the analysis of EI-MS, $^1$H and \ulcornerC NMR spectroscopy. This inhibitory showed cytotoxicity against human leukemia Jurkat T and HL60 cells with an IC\ulcorner value of 7 $\mu\textrm{g}$/ml. These results suggest the possibility of falcarindiol as a new anticancer agent which can be expected to have a synergistic effect on other anticancer drugs. In addition, the present data show that falcarindiol has antifungal, yet not antibacterial, activity.

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