• 한국약용작물학회지
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• 제9권2호
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• pp.108-115
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• 2001

국내에서 자생하고 있는 만수국아재비의 정유함량 및 구성성분 조성을 조사하기 위하여 전남 고흥과 전북 부안지역에서 수집한 다음 수증기 증류법으로 분리한 정유의 함량은 각각 0.52%와 0.48%이었다. 얻어진 정유로부터 GC, GC-MS 및 문헌상의 Rl값과 비교에 의해 69종의 성분을 동정하였으나 monoterpene, sesquiterpene 및 sesquiterpene alcohol류가 많이 검출되었다. 동정된 성분들 중 GC peak 면적비를 기준으로 함유비율이 높은 성분은 limonene, $cis-{\beta}-ocimene$, diydrotagetone, trans-tagetone, cis-tagetone, trnas-tagetenone 및 cis-tagetenone 등이었다. Limonene의 함유비율은 전남 고흥과 전북 부안에서 수집한 만수국아재비의 정유에서 각각 6.41%와 5.83% 로서 두 시료간에 큰 차이가 없었으나 $cis-{\beta}-ocimene$은 고흥에서 수집한 시료의 정유에서 47.73%인 반면 부안에서 수집한 시료의 정유에서는 4.87%를 차지하였고, dihydrotagetone의 경우 고흥에서 수집한 시료의 정유에서는 14.78%인 반면 부안에서 수집한 시료의 정유에서는 52.83%로서 시료간에 큰 차이를 보였다. 또한 trans-tagetone과 cis- tagetone은 고흥지역보다는 부안지역에서 수집한 시료의 정유에서 높은 반면 trans-tagetenone과 cis-tagetenone은 부안 지역보다는 고홍지역에서 수집한 시료의 정유에서 함유비율이 높았다.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1994년도 춘계학술대회 and 제3회 신약개발 연구발표회
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• pp.218-218
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• 1994

화합물 9-methoxy-6-oxo-3,4,4a,5-tetrahydro-3-hydroxy-2,2-dimethyl-naphtho[1,2〕pyran(1)의 전구물질인 7-methoxy-4-oxo-2-prenyl-1-tetralol을 다음과 같은 방법으로 합성하였다. 7-Methoxy-$\alpha$-tetralone에 LDA를 처리한 후, prenyl bromide를 반응시켜 7-methoxy-2-prenyl-1-tetralone을 제조했다 (수율 66%). 7-Methyl-2-prenyl-1-tetralone을 L-seleclride로 환원하여 cis-2-prenyl-1-tetralol을98% 수율로 얻었다. cis-2-Prcnyl-1-tetralol을pyridine 존재하에서 acetic anhydride로서acetylation한 다음 PDC로 산화시켜 4-acetoxy-3-prenyl-1-tetralone을 합성하였다 (수율 45%). cis-4-Acetoxy-3-prenyl-1-tetralone을 가수분해하여 cir-7-methoxy-4-oxo-2-prenyl-1-tenalol을 합성하였다. 6,7-Dimethoxy-4-oxo-2-prenyl-1-letralol도 동일한 방법으로 합성하였다.

• 한국재료학회지
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• 제9권5호
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• pp.473-477
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• 1999

Xerographic properties of double-layer photoconductor doped with 4-butyl-4'-methoxyazobenzene (BMAB) as charge-carrier transport material were investigated. BMAB can undergo reversible trans-cis isomerization by light with appropriate wavelength. In the results of measured surface voltage properties for photoconductor doped with BMAB, TNF: BMAB(4-wt%) sample with trans form showed the lowest dark decay, the lowest residual voltage, and the highest sensitivity among cis form. The trans isomer of BMAB has ordering orientation because the molecule possesses a rodlike shape, while the cis isomer has random orientation due to its bent shape. Therefore the molecular arrangement of trans form enhanced charge-carrier transport mobility.

• 대한화학회지
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• 제41권9호
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• pp.483-487
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• 1997

Chromobacterium chocolatum의 whole cell을 polyacrylamide의 matrix안에 고정화 하였으며 이를 이용하여 dimethyl-cis-1,3-dibenzyl-2-oxoimidazolidine-4,5-dicarboxlyate를 가수분해 하였다. 고정화된 mycelium을 이용하여 가수분해하는 최적조건을 연구하였다. 기질의 농도, 반응시간, 용액의 pH변화에 다른 lipase의 안정성및 반응의 영향을 연구하였다. 고정회된 mycelium의 리파아제의 활동도는 4주이상 지속되었고 wet cell 2g을 고정화 하여 200 mg의 기질을 pH=7의 반응조건에서 반응시켰을 때 최대 수율로 생성물이 얻어졌다.

• Preventive Nutrition and Food Science
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• 제6권1호
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• pp.1-5
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• 2001

Pigment extracts obtained from Star Ruby grapefruit pulp were stored at different temperatures (4.5$^{\circ}C$, 23$^{\circ}C$) and exposed to light. many carotenoid oxidation products were formed due to light-exposure during storage periods. They were monitored by using HPLC with photodiode array detection and tentatively identified. Including (all-E)-lycopene and trans-$\beta$-carotene as predominant carotenoids in red grapefruit, 5Z-lycopene, 9Z-lycopene, 13Z-lycopene, and 15-cis-$\beta$-carotene were formed at 4.5$^{\circ}C$, 23$^{\circ}C$. Degradation of all-tarns lycopene was more susceptible to light-exposure and temperature a than that of all-trans $\beta$-carotene. The formation of lycopene cis isomers was favored under lighted condition. Respectively, (5Z)-lycopene was formed in greater amounts than other isomers at 23$^{\circ}C$ storage. The concentration of 15-cis-$\beta$-carotene was significantly increased during storage at 23$^{\circ}C$ storage. The concentration of 15-cis-$\beta$-carotene was significantly increased during storage at 23$^{\circ}C$.

• Plant Resources
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• 제1권1호
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• pp.33-37
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• 1998

Carotenoid compounds in embryos of wild-type(WT) and viviparous mutants of maize(Zea mays L.) were analyzed using high performance liquid ehromatography (HPLC) with a photodiode array detector. Zeaxanthin accumulates in WT embryos as the major carotenoid. Phytoene accumulates in vp2 and vp5. Phytofluene in w3 and ${\xi}$-carotene in the vp9 mutant embryos. This indicates that the vp2 and vp5 mutants impair phytoene desaturase from 15-cis-phytoene to 15-cis-phytofluene. The w3 mutant has neither an isomerase from 15-cis-phytofluene to all-trans-phytofuene nor phytofluene desaturase from phytofluene to ${\xi}$-carotene. The vp9 mutant does not have the ${\xi}$-carotene desaturase from ${\xi}$-carotene to lycopene. Our analysis shows that the terminal carotenoid. ${\gamma}$-carotene(${\beta},{\Psi}$-carotene), accumulates in the vp7 mutant embryos. The ${\varepsilon}$-carotene(${\varepsilon},{\varepsilon}$-carotene), a product of ${\delta}$-carotene(${\varepsilon},{\Psi}$-carotene) in some plants, however, has not been found in maize embryos. The vp7 mutant impairs a cyclization step from ${\gamma}$-carotene to both ${\beta}$-carotene and ${\alpha}$-carotene. We suggest that monocyclic ${\gamma}$-carotene is the sole precursor of both bicyclic ${\beta}$-carotene(${\beta},{\beta}$-carotene) and ${\alpha}$-carotene(${\beta},{\varepsilon}$-carotene) in maize.

• 고려인삼학회:학술대회논문집
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• 고려인삼학회 1988년도 학술대회지
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• pp.19-24
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• 1988

[ $L_{1210}$ ] 세포에 대하여 세포독성이 있는 두개의 새로운 polyyne을 인삼으로부터 분리하였는데 이들은 acetylpanaxydol과 panaxy-dolchlorhydrin이다. Panaxydol 유사체의 C-9 위치에 있는 epoxy group과 C-10 위치의 heptyl group 은 세포독성을 강화시켜준다. Panaxydol의 epoxy group 은 cis와 trans 이성체들간의 세포독성 차이는 없다. Panaxydol과 이들 이성체들에서 세포독성을 발휘하는 필수구조는 hept-l-en-4.6-diyn-3-ol이다.

• Bulletin of the Korean Chemical Society
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• 제5권1호
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• pp.27-32
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• 1984

To investigate the hydration effects on the conformational changes of N-pivaloly-L-prolyl-N-methyl-N'-isopropyl-L-alanin amide (PPMIA), the conformational free energy changes have been calculated by using an empirical potential function varying all the independent degrees of freedom of PPMIA backbones. It is found that cis conformers are folded by a strong intramolecular hydrogen bond involving both terminal CO and NH groups whereas trans conformers accommodate the open conformation. Conformers in the free state are proved to be less stable than in the hydrated state. The free energy changes of cis and trans PPMIA due to the hydration are -50.5 and -39.8 kcal/mole, their conformational energy changes are -52.3 and -41.0 kcal/mole, and their conformational entropy changes are -5.9 and -4.0 e.u., respectively. The free energy changes of cis PPMIA to trans PPMIA in the free and hydrated states are 5.3 and 16.0 kcal/mole, their conformational energy changes are 7.6 and 18.8 kcal/mole, and the entropy changes due to the conformational transitions correspond to 7.5 and 9.4 e.u., respectively. From these results, it is found that the bound water molecules play an important role in stabilizing the conformation of PPMIA.

• 대한의생명과학회지
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• 제13권2호
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• pp.149-152
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• 2007

Mast cells play important roles in immune-related diseases, in particular, allergic diseases. Although 9-cis retinoic acid (9CRA) has been known as an immune regulator, its function in mast cells is not characterized well. In a previous paper, we demonstrated that 9CRA differentially decreases both CCR2 expression and the MCP-1-induced chemotactic activity of the human mast cell line, HMC-1 cells. In the present study, we examined the effects of 9CRA on the migration and expressions of inflammatory cytokines in HMC-1 cells. It was found that 9CRA significantly inhibited the migration of HMC-1 cells in response to stem cell factor (P<0.01), and it had no effect on the mRNA and protein expression of c-kit, a receptor binding to SCF. We further investigated the alternation of inflammatory cytokine expression and identified that 9CRA blocked the mRNA and protein expressions of Th2 cytokines such as interleukin (IL)-4 and IL-5. Taken together, our results demonstrate that 9CRA blocks SCF-induced cell movement and the protein secretion of IL-4 and IL-5, and this indicates that 9CRA may have anti-inflammatory effects on mast cells.

• Bulletin of the Korean Chemical Society
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• 제16권9호
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• pp.859-863
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• 1995

The prostaglandin analogue 12-epi-PGF2α (2) has been synthesized from optically active cis-4-t-butyldimethylsilyloxy-2-cyclopenten-1-ol (4b) in 4 steps in an overall yield of 21%. An extremely efficient Pd(Ⅱ)-mediated, three-component coupling reaction is employed to obtain the key intermediate 9.