• 제목/요약/키워드: Liriodendron tulipifera

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NMR Assignments of Rotameric Aporphine Alkaloids from Liriodendron tulipifera

  • Park, InWha;Na, MinKyun
    • Natural Product Sciences
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    • 제26권2호
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    • pp.171-175
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    • 2020
  • Liriodendron tulipifera, belonging to the family Magnoliaceae, is commonly called tulip tree. Four N-acetylated aporphine alkaloids, N-acetylnornuciferine (1), N-acetylanonaine (2), N-acetyl-3-methoxynornuciferine (3), and N-acetyl-3-methoxynornantenine (4) were isolated from the roots of L. tulipifera. Although the purity of each compound (1 - 4) was determined to be 97, 96, 99, and 98%, respectively, the 1H and 13C NMR spectroscopic data of the aporphine alkaloids 1 - 4 displayed all signals in duplicate, indicating the presence of two rotamers due to restricted rotation of N-COCH3 functionality in solution status. The absolute configurations of 1 - 4 w ere established by measuring specific rotation and comparison with the reported data. This is the first report on the 1H and 13C NMR assignments of N-acetyl-3-methoxynornuciferine (3) and N-acetyl-3-methoxynornantenine (4). This study provides advanced NMR spectroscopic data for the structure determination of rotameric aporphine alkaloids.

조경수목(造景樹木)의 대기오염물질(大氣汚染物質)에 대한 피해반응(被害反應)(III) - Malondialdehyde 함량(含量)을 중심으로 - (Injury Responses of Landscape Woody Plants to Air Pollutants - Malondialdehyde content -)

  • 김명희;이수욱
    • 한국산림과학회지
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    • 제83권1호
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    • pp.25-31
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    • 1994
  • 대기오염물질(大氣汚染物質)에 의한 조경수목(造景樹木)들의 피해(被害)의 감수성(感受性) 정도를 조사하기 위하여 서울, 대전 등 대도시(大都市) 지역과 광릉(光陵)지역을 선정하고 소나무, 잣나무, 은행나무, 튜립나무 및 양버즘나무 잎을 채취하여 MDA 함량(含量)을 측정하였다. 또한 소나무, 잣나무, 스트로브잣나무, 은행나무 및 튜립나무에 무처리(無處理), 0.5, 1.5 및 2.5 ppm의 $SO_2$ 가스를 각각 하루에 4시간(時間)씩 6일간(日間) 처리(處理)한 후, 잎의 MDA 함량(含量)을 측정(測定), 분석(分析)하였다. 은행나무, 양버즘나무 및 튜립나무의 MDA 함량(含量)은 비오염지역(非汚染地域)보다 오염지역(汚染地域)에서 높았으며, 조사대상(調査對象) 수종중(樹種中) 튜립나무의 MDA 함량(含量)이 제일 높았다. 소나무와 잣나무에서는 엽령(葉令)이 높아질수록 MDA 함량(含量)이 증가하였다. $SO_2$, 처리시(處理時) 튜립나무는 처리농도(處理濃度)가 높아질수록 MDA 함량(含量)이 증가하였으나 다른 수종에서는 처리농도(處理濃度)에 따라 큰 차이(差異)가 나타나지 않았다. $SO_2$를 6일간(日間) 처리(處理)했을 때 5수종(樹種) 모두 처리일(處理日)이 경과함에 따라 MDA 생성(生成)이 증가하였으며, 특히 튜립나무는 MDA 생성(生成)이 뚜렷하게 높았으며, 처리(處理)개시 후 점정 증가하여 처리(處理) 4일 만에 최대치(最大値)를 나타내다가 그 후에는 감소하였다.

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Visual and Physiological Characteristic Changes of Five Tree Species Exposed to SO2

  • Kwon, Ki-Won;Choi, Jeong-Ho;Woo, Su-Young;Lee, Jae-Cheon;Lee, Jeong Ho
    • 한국산림과학회지
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    • 제95권2호
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    • pp.216-219
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    • 2006
  • After long exposure to low-density $SO_2$ the five tree species showed different changes in their visible damage: Ailanthus altissima showed no visible damage; Acanthopanax sessiliflorus, Populus alba ${\times}$ Populus glandulosa, and Platanus orientalis showed typical damage of yellow spots on their leaves; and Liriodendron tulipifera showed serious damage on the end of leaf tip. The photosynthesis rate of Liriodendron tulipifera and Acanthopanax sessiliflorus was usually lower than the control group: Ailanthus altissima, Populus alba ${\times}$ Populus glandulosa, and Platanus orientalis showed no difference from the control group, while Acanthopanax sessiliflorus and Liriodendron tulipifera showed large changes. In regard to the light compensation points, Ailanthus altissima showed similar values, Populus alba ${\times}$ Populus glandulosa and Platanus orientalis exposed to $SO_2$, showed 3 to $5{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ higher values than the control group, and Acanthopanax sessiliflorus and Liriodendron tulipifera exposed to $SO_2$ showed approximately twice higher light compensation points.

Antioxidative Constituents from the Woods of Liriodendron tulipifera

  • Lee, Yeon-Suk;Lee, Hak-Ju;Park, YoungKi;Park, Jae-In;Choi, Tae-Ho
    • Journal of the Korean Wood Science and Technology
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    • 제32권6호
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    • pp.43-49
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    • 2004
  • Three flavonoids, quercetin, taxifolin, and kaempferol were isolated from the woods of Liriodendron tulipifera. Their structures were determined by spectral analysis. Based on 1, l-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity method, the antioxidative activities of three isolated compounds and their acetates were measured in order to search for natural antioxidants. The IC50 of quercetin (1), taxifolin (2), and kaempferol (3) were 3.6, 3.9, and 4.1 ㎍/㎖, respectively.

충치균에 대한 생리활성 생약성분의 분리 및 약효평가(1) -튜립나무잎의 항균성 성분과 안전성에 대하여- (The Isolation and Evaluation of Bioactive Components from Crude Drugs against a Cariogenic Bacterium, Streptococcus mutans OMZ 176 (1) -On the Antibacterial Component of the Leaves of Liriodendron tulipifera and Its Safety-)

  • 배기환;김봉희;명평근;변재화
    • 약학회지
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    • 제34권2호
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    • pp.106-111
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    • 1990
  • The isolation and identification of an antibacterial component, from the leaves of Liriodendron tulipifera. K. Kotch against a cariogenic bacterium Streptococcus mutans OMZ 176, were carried out for developing of anticariogenic agents. The bioactive component was elucidated as ${\beta}-liriodenolide$, which was isolated newly from the leaves of L. tulipifera. The minimal inhibitory concentration (MIC) of ${\beta}-liriodenolide$ was $100\;{\mu}g/ml$ and the antibacterial activity was stronger than that of berberine. ${\beta}-Liriodenolide$ inhibited ${\beta}-lactamase$ activity, 50, 100 and $200\;{\mu}M$ ${\beta}-liriodenolide$ did ${\beta}-lactamase$ activity as 0.7, 3.5 and 19.7%, respectively. The toxicity of ${\beta}-liriodenolide$ was not found with the method of photohemolysis.

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리기테다소나무와 백합나무(yellow poplar)의 열기건조스케줄 개발 (Development of Kiln-Dry Schedules for Pinus $rigida{\times}taeda$ and Liriodendron tulipifera)

  • 이관영;강호양;정성호;정두진
    • 한국가구학회지
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    • 제11권1호
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    • pp.69-74
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    • 2000
  • Pinus $rigida{\times}taeda$ and Liriodendron tulipifira have been planted in this country for about 20 years. They are known as a relatively 13st-grown and useful species. The physical properties such as green moisture contents, specific gravities and dimensional shrinkages were examined with natively grown timbers. The kiln-dry schedules were developed with 30m thick boards by using an oven-fast-drying method. In both species the green MC's of sapwoods were higher than those of heartwoods, but their discrepancies were small. The green specific gravities of Pinus $rigida{\times}taeda$ and Liriodendron tulipifera were 0.48 and 0.41~O.42, respectively. The developed kiln-dry schedules were proven to minimize drying defects for the hoards of 30mm thickness and various width.

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반응표면분석법을 이용한 유기용매 전처리된 백합나무 (Liriodendron tulipifera)의 최적 효소 당화 조건 탐색 (Investigation on optimal conditions for enzymatic hydrolysis of organosolv pretreated Liriodendron tulipifera using response surface methodology)

  • 곽기섭;김호용;정한섭;김혜연;여환명;최인규
    • 한국임산에너지학회:학술대회논문집
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    • 한국산림바이오에너지학회 2011년도 정기총회 및 학술연구발표회
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    • pp.41-44
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    • 2011
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Screening of Leaves of Higher Plants for Antibacterial Action

  • Bae, Ki-Hwan;Byun, Jae-Hwa
    • 생약학회지
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    • 제18권1호
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    • pp.1-4
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    • 1987
  • The methanol and benzene extracts of the leaves of 55 higher plants in Korea were tested for their antibacterial activity against three Gram positive bacteria, Streptococcus mutans, Staphylococcus aureus and Bacillus subtilis, and one Gram negative bacterium Escherichia coli. Among them, the methanol extract of the leaves of Liriodendron tulipifera showed remarkably potent antibacterial activity against both Gram positive and negative bacteria.

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Conversion Characteristics of Chemical Constituents in Liriodendron tulipifera and Their Influences on Biomass Recalcitrance during Acid-Catalyzed Organosolv Pretreatment

  • Ki-Seob GWAK;JunHo SHIN;Chae-Hwi YOON;In-Gyu CHOI
    • Journal of the Korean Wood Science and Technology
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    • 제52권2호
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    • pp.101-117
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    • 2024
  • The conversion characteristics of the major components of Liriodendron tulipifera were investigated during acid-catalyzed organosolv pretreatment. Glucan in L. tulipifera was slowly hydrolyzed, whereas xylan was rapidly hydrolyzed. Simultaneous hydrolysis and degradation of xylan and lignin occurred; however, after complete hydrolysis of xylan at higher temperatures, lignin remained and was not completely degraded or solubilized. These conversion characteristics influence the structural properties of glucan in L. tulipifera. Critical hydrolysis of the crystalline regions in glucan occurred along with rapid hydrolysis of the amorphous regions in xylan and lignin. Breakdown of internal lignin and xylan bonds, along with solubilization of lignin, causes destruction of the lignin-carbohydrate complex. Over a temperature of 160℃, the lignin that remained was coalesced, migrated, and re-deposited on the surface of pretreated solid residue, resulting in a drastic increase in the number and content of lignin droplets. From the results, the characteristic conversions of each constituent and the changes in the structural properties in L. tulipifera effectively improved enzymatic hydrolysis in the range of 140℃-150℃. Therefore, it can be concluded that significant changes in the biomass recalcitrance of L. tulipifera occurred during organosolv pretreatment.

암모니아수 침지처리가 백합나무(Liriodendron tulipifera L.)의 화학적 조성 변화와 효소 당화에 미치는 영향 (Effects of Aqueous Ammonia Soaking to Chemical Compositional Changes and Enzymatic Saccharification of Yellow Poplar (Liriodendron tulipifera L.))

  • 신수정;유주현;조남석;최인규;김문성;박종문
    • 펄프종이기술
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    • 제41권1호
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    • pp.61-66
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    • 2009
  • Effects of aqueous ammonia soaking treatments to yellow poplar (Liriodendron tulipifera L.) were investigated to focus on chemical compositional changes and enzymatic hydrolysis characteristics changes by this treatment. Treatment temperature and time were main variables. At 3 different levels of aqueous ammonia soaking temperature and time ($145^{\circ}C$ -1 h, $90^{\circ}C$ -16 h and $45^{\circ}C$ - 6 days), lower temperature and longer soaking time led to more xylan removal based on carbohydrate compositional analysis. However, at higher temperature treatment led to more enzymatic saccharification of cellulose to glucose by commercial cellulose mixtures (Celluclast 1.5L and Novozym 342 from Novozyme, Denmark). Cellulose hydrolysis was gradually increased with increasing enzymatic hydrolysis time but xylan hydrolysis was leveled out at early stage (less than 10 h) of enzymatic hydrolysis.