• Food Science and Biotechnology
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• 제17권5호
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• pp.1060-1065
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• 2008

A novel benzoyl glucoside (4) and 13 known phenolic compounds were isolated from the leaves of Camellia japonica by a guided 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay. The structure of 4 was determined to be 4-hydroxy-2-methoxyphenol 1-O-$\beta$-D-(6'-O-p-hydroxylbenzoyl)-glucopyranoside (camelliadiphenoside). The 13 known compounds were identified as (E)-coniferyl alcohol (1), (-)-epicatechin (2), 4-hydroxyphenol 1-O-$\beta$-D-(6-O-p-hydroxybenzoyl) glucopyranoside (3), naringenin 7-O-$\beta$-D-glucopyranoside (5), quercetin 3-O-$\beta$-L-rhamnopyranosyl(1$\rightarrow$6)-$\beta$-D-glucopyranoside (6), kaempferol 3-O-$\beta$-L-rhamnopyranosyl(1$\rightarrow$6)-$\beta$-D-glucopyranoside (7), (+)-catechin (8), 1,6-di-O-p-hydroxybenzoyl-$\beta$-D-glucopyranoside (9), phloretin 2'-O-$\beta$-D-glucopyranoside (10), quercetin 3-O-$\beta$-D-glucopyranoside (11), quercetin 3-O-$\beta$-D-galactopyranoside (12), kaempferol 3-O-$\beta$-D-galactopyranoside (13), and kaempferol 3-O-$\beta$-D-glucopyranoside (14). Their chemical structures were determined by the spectroscopic data of fast atom bondardment mass spectrometry (FABMS) and nuclear magnetic resonance (NMR). Flavonoids having the catechol moiety showed significantly higher DPPH radical scavenging activity than other isolated compounds having monohydroxy phenyl group.

• Archives of Pharmacal Research
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• 제23권2호
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• pp.159-162
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• 2000

A new stilbene diglycoside, piceatannol-3, 4'-O-$\beta$-D-diglucopyranoside (I), together with desoxyrhaponticin (II), emodin-1-O-$\beta$-D-glucopyranoside (III), and physcion-8-O-b-D-gluco-pyranoside (IV), were isolated from the rhizomes of cultivated Korean rhubarb rhizomes(Rheum undulatum), Jong DaeWhang, and the structures of 1-IV were identified on the basis of chemical and spectral evidences.

• Applied Biological Chemistry
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• 제3권
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• pp.25-48
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• 1962

tragacanth gum의 화학구조(化學構造)를 구명(究明)하기 위(爲)하여 미국(美國) 약전(藥典)의 tragacanth gum 분말(粉末)을 가지고 다음의 실험(實驗)을 통(通)하여 이의 성분(成分)의 하나인 polysaccharide C를 분리(分離)하여 이의 화학구조(化學構造)를 밝혔다. (1) tragacanth gum을 85% 주정(酒精)으로 처리(處理)해서 중성다당류(中性多糖類)로 polysaccharide C를 분리(分離)하였으며 구성당(構成糖)으로 L-rhamnose, D-xylose, L-arabinose 및 D-galactose를 paper chromatography와 Cellulose column chromatography로 분리(分離), 동정(同定)하였다. 이의 molar ratio는 2:1:17:9이며 비선광도(比旋光度)는 $[{\alpha}]^{30}_D-72.2이다. (2) 구성당(構成糖)의 결합위치(結合位置)를 구명(究明)하기 위(爲)해 Hawarth 법(法)과 Purdietldir(試藥)을 가지고 methyl화(化)시켜 methyl화(化) polysaccharide C를 얻었으며 비선광도(比旋光度) $[{\alpha}]^{22}_D-102를 보였다. 이것을 가수분해(加水分解)시켜 paper chromatography와 column chromatography를 통(通)해 methyl화단당(化單糖)으로 1,3,5-tri-O-methyl-L-arabofuranose, 3,4-di-O-methyl-L-rhamnose, 2,3-di-O-methyl-D-xylose, 2,3,4-tri-O-methyl-D-galactopyranose, 2,4-di-O-methyl-L-arabopyronose, 2,4-di-O-methyl-D-galactose, 2-O-methyl-L-arabinose 및 L-arabinose를 분리(分離), 동정(同定)하였다. (3) 산(酸)의 각종농도(各種濃度)에 따른 부분적(部分的) 가수분해(加水分解)를 시켜 polysaccharide C의 end group, 측지(側枝) 또는 주쇄(主鎖)를 이루는 구성당(構成糖)을 밝히기 위(爲)하여 0.05 N-HCl로 제1차(第一次) 가수분해(加水分解). 0.1N-HCl로 제2차(第二次) 가수분해(加水分解), 0.3N-HCl로 제3차(第三次) 가수분해(加水分解)를 하여 가수분해물(加水分解物)과 비가수분해물(非加水分解物)에서 각각(各各) 다음과 같은 구성단당(構成單糖)을 검출(檢出)하고 이들의 molar ratio를 측정(測定)하였다. 제1차(第一次) 가수분해물(加水分解物)(A)에서 L-arbinose, 비가수분해물(非加水分解物)(A')에서 L-rhamnose, D-xylose, L-arabinose 및 D-galactose; 제2차(第二次) 가수분해물(加水分解物)(B)에서 L-arabinose와 D-galactose, 비가수분해물(非加水分解物)(B')에서 L-rhamnose, D-xylose, L-arabinose, 및 D-galactose; 제3차(第三次) 가수분해물(加水分解物)(C)에서 L-rhamnose, D-xylose, L-arabinose 및 D-galactose, 비가수분해물(非加水分解物)(C')에서 D-xylose와 D-galactose를 검출(檢出)하였다. (4) 구성당(構成糖)의 형태(形態)와 구조(構造)를 밝히기 위(爲)해 polysaccharide C에 대한 periodate산화(酸化) 실험(實驗)을 하여 $C_5H_8O_4$당(當) periodate의 소비(消費)와 formic acid의 생성량(生成量)을 측정(測定)하였는데 periodate의 소비량(消費量)은 1.23 mole, formic acid의 생성량(生成量)은 0.78 mole이다.

• Archives of Pharmacal Research
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• 제22권4호
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• pp.428-431
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• 1999

Seven known oleanolic acid glycosides (1-7) were isolated form the MeOH extract of Tiarella polyphylla. The structures were identified to be 3-O-($\beta$-glucopyranosyl) oleanolic acid (1), 3-O-[$\beta$-D-glucopyranosyl-(1 3)-$\beta$-D-glucopyranosyl] oleanolic acid (2), 3-O-D-[$\beta$-D-glucopyranosyl-(1 2)-$\beta$-D-glycopyranosyl] oleanolic acid (3), 3-O-[$\beta$-D-glucopyranosyl-(1 3)-$\beta$-D-glucopyranosyl] oleanolic acid 28-O-$\beta$D-glucopyranosyl ester (4), 3-O-[$\beta$-D-glucopyranosyl-(1 2)-$\beta$-D-glucopyranosyl] oleanolic acid 28-O-$\beta$-D-glucopyranosyl ester (5), 3-O-[a-L-rahmnopyranosyl-(1 3)-$\beta$-D-glucururonopyranosyl] oleanolic acid (6), and 3-O-[$\alpha$-L-rhamnopyranosyl-(1 3)-$\alpha$-D-glucuronopyranosyl] oleanolic acid 28-O-$\alpha$-D-glucopyranosyl ester (7) on the basis of physicochemical and spectral data. These triterpene glycosides were tested for the anti-complement activity and hemolytic activity. Bisdesmosidic saponins, 4, 5, and 7, showed anti-complement activity; in contrast, monodesmosidic saponins, 1-3, and 6, showed direct hemolytic activity. Methyl esterified monodesmosidic saponins showed anti-complement activity at a low concentration and hemolytic activity at a high concentration.

• Archives of Pharmacal Research
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• 제12권1호
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• pp.42-47
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• 1989

From the roots of Puisatiila koreana, three monodesmosides(pulsatilla saponins A, B and D) and two bisdesmosides(pulsatilla saponins F and H) were isolated. The structure of these saponins have been determined as hederagenin 3-O-${\beta}$-L-rhamnopyranosyl($1{\to}2$)- ${\alpha}$-L-arabinopyranoside(A), hederagenin 3-O-${\beta}$-D-glucopyrano syl($1{\to}4$) - ${\alpha}$-L-arabinopyranoside(B), hederagenin 3-O- ${\alpha}$-L-rhamnopyranosyl ($1{\to}2$)-[${\beta}$-D-glucopyranosyl($1{\to}4$]-${\alpha}$-L-arabinopyranoside(D), 3-O-${\alpha}$-L-rhamnopyranosyl($1{\to}2$)-{${\alpha}$-L-arabinopyranosyl hederagenin 28-O-${\alpha}$-L-rhamnopyrano syl($1{\to}4$)-${\beta}$-D-glucopyrano syl($1{\to}6$)-${\beta}$-D-glucopyranosyI ester (F) and 3-O-${\alpha}$-L-rhamnopyranosyl($1{\to}2$)-[${\beta}$-D-glucopyranosyl($1{\to}4$)]- ${\alpha}$-L-arabinopyranosyl hederagenin 28-O-${\alpha}$-L-lharnnopyranosyl($1{\to}4$)-${\beta}$-D-glucopyranosyl($1{\to}6$)-${\beta}$-D-glucop yranosyl ester(H) on the basis of chemical and spectral studies. Pulsatilla saponin B is the first report of its presence in plants but saponins A, D, F, and H have recently been isolated from the same genus p. cernua.

• 한국응용과학기술학회지
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• 제5권2호
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• pp.1-8
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• 1988

D-Glucoses, one of the aldohexoses, was reacted with carbonyl compound such as actione or cyclohexanone. Hydroxy groups which are C-1, C-2 site and C-5, C-6 site of D-glucose molecule were substituted with isopropylidene or cyclohexylidene group and such 3-O-acyl-D-glucoses as 3-O-lauroyl-D-glucose, 3-O-myristoryl-D-glucose, 3-O-palmitoyl-D-glucose, 3-O-stearoyl-D-glucsoe and 3-O-oleoyl-D-glucose were obtained by acylation with acylchlorides having from 12 to 18 carbon atoms followed by hydrolysis.

• Bulletin of the Korean Chemical Society
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• 제22권12호
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• pp.1333-1336
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• 2001

A theoretical analysis is presented for the multichannel type resonance at energies above the dissociation threshold to O(1D) in the photodissociation of OH. Dissociations to both oxygenic terms O(3P) and O(1D) are treated. Total cross sections for producing these oxygen terms display asymmetric resonance due to the quantum interference resulting from complicated interplay of electronic states correlating to these two oxygenic terms. The branching ratios of O(3Pj, j = 0, 1, 2), and the vector properties of O(3Pj, j =0,1,2) and O(1D) display extensive changes near the threshold resonance as the result of the interactions among the electronic states correlated with O(3P) and O(1D).

• 생약학회지
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• 제36권4호통권143호
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• pp.282-290
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• 2005

The MeOH extract of the the leaves of Salix hallaisanensis (Salicaceae) was partitioned successively with $CHCl_3$, 20% MeOH, 40% MeOH and 60% MeOH solution. From the fractions obtained, 9 compounds were isolated, $diosmetin-7-O-{\beta}-d-glucoside$ (I), $diosmetin-7-O-{\beta}-D-glucosyl-(1{\rightarrow)6)-{\beta}-d-glucoside$ (II), $diosmetin-7-O-{\beta}-d-xylosyl-(1{\rightarrow}6)-{\beta}-D-glucoside$ (III), $quercetin-3-O-{\beta}-d-galactoside$ (hyperoside) (IV), $quercetin-3-O-{\alpha}-l-rhamnosyl-(1{\rightarrow}6)-{\beta}-D-glucoside(rutin)$ (V), luteolin (VI), $luteolin-7-O-{\beta}-d-glucoside$ (VII), $kaempferol-3-O-{\alpha}-l-rhamnosyl-(1{\rightarrow}6)-{\beta}-D-glucoside$ (VIII), and (+)-catechin (IX).

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.2089-2094
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• 2003

The flow around a circular cylinder was controlled by attaching O-rings to reduce drag force acting on the cylinder. Four experimental models were tested in this study; one smooth cylinder of diameter D (D=60mm) and three cylinders fitted with O-rings of diameters d=0.0167D, 0.05D and 0.067D with pitches of PPD=1D, 0.5D and 0.25D. The drag force, mean velocity and turbulent intensity profiles in the near wake behind the cylinders were measured for Reynolds numbers based on the cylinder diameter in the range of $Re_D=7.8{\times}10^3{\sim}1.2{\times}10^5$. At $Re_D=1.2{\times}10^5$, the cylinder fitted with O-rings of d=0.0167D in a pitch interval of 0.25D shows the maximum drag reduction of about 5.4%, compared with the smooth cylinder. The drag reduction effect of O-rings of d=0.067D is not so high. For O-ring circulars, as the Reynolds number increases, the peak location of turbulence intensity shifts downstream and the peak magnitude is decreased. Flow field around the cylinders was visualized using a smoke-wire technique to see the flow structure qualitatively. The size of vortices and vortex formation region formed behind the O-ring cylinders are smaller, compared with the smooth cylinder.

• Journal of applied mathematics & informatics
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• 제17권1_2_3호
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• pp.605-614
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• 2005

We show that an Artinian O-sequence $h_0,h_1,{\cdots},h_{d-1},h_d\;=\;h_{d-1},h_{d+l}\;>\;h_d$ of codimension 3 is not level when $h_{d-1}\;=\;h_d\;=\;d + i\;and\;h{d+1}\;=\;d+(i+1)\;for\;i\;=\;1,\;2,\;and\;3$, which is a partial answer to the question in [9]. We also introduce an algorithm for finding noncancelable Betti numbers of minimal free resolutions of all possible Artinian O-sequences based on the theorem of Froberg and Laksov in [2].