http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Excavasides A and B, two new flavonoid glycosides from <i>Clausena excavata</i> Burm. f. (Rutaceae)
Seo, Changon,Ahn, Eun-Kyung,Kang, Jae-Shin,Lee, Jae-Ho,Oh, Joa Sub,Hong, Seong Su Elsevier 2017 PHYTOCHEMISTRY LETTERS Vol.20 No.-
<P><B>Abstract</B></P> <P>Two new flavonoid glycosides, excavaside A (<B>1</B>) and B (<B>2</B>), together with 14 known compounds, myricetin 3-<I>O</I>-β-<SMALL>D</SMALL>-rutinoside (<B>3</B>), myricetin 3,3′-di-α-<SMALL>L</SMALL>-rhamnopyranoside (<B>4</B>), myricetin 3′-α-<SMALL>L</SMALL>-rhamnopyranoside (<B>5</B>), myricitrin (<B>6</B>), myricetin (<B>7</B>), quercitrin (<B>8</B>), clauslactone B (<B>9</B>), clauslactone A (<B>10</B>), murrayacoumarin C (<B>11</B>), clauslactone E (<B>12</B>), triphasiol (<B>13</B>), clauslactone P (<B>14</B>), seseline (<B>15</B>), and 5-geranyloxy-7-hydroxycoumarin (<B>16</B>) have been isolated from the ethanol extract of the leaves and twigs of <I>Clausena excavata</I>. Among them, compounds <B>3</B>–<B>5</B> and <B>13</B> were isolated and identified from this plant for the first time. The structures of the new compounds were established by spectroscopic data interpretation, particularly HRESIMS, 1D and 2D NMR data including HSQC and HMBC. Also, those of the known compounds were identified by spectral comparison with those of the reported values.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sixteen compounds, including two new flavonoid glycosides were isolated from the leaves and twigs of <I>Clausena excavata</I>. </LI> <LI> Four compounds were reported from <I>Clausena excavata</I> for the first time. </LI> <LI> Structure elucidation was based on spectroscopic techniques (1D-, 2D-NMR, and HRMS experiments). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Studies on Phytochemical Constituents from the Black Ginseng (Ginseng Radix nigra)
Changon Seo(서찬곤),Jin Kyu Kim(김진규),Seong Su Hong(홍성수),Jin Gwan Kwon(권진관),Chun Whan Choi(최춘환),Wonsik Jeong(정원식),Yun-Hyeok Choi(최윤혁),Junho Oh(오준호),Ji Hye Lee(이지혜),Joa Sub Oh(오좌섭) 한국약용작물학회 2014 한국약용작물학회 학술대회논문집 Vol.2014 No.2
Studies on chemical constituents and method validation of Rutin from Sambucus nigra L. (Elderberry)
Changon Seo,Jin Gwan Kwon,Woo Jung Kim,Yongmun Choi,Myung-Jin Song,Jin Kyu Kim 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11
Sambucus nigra L. (European elderberry or black elderberry, Familia Adoxaceae) is a good source of biologically active components, primarily flavonols, phenolic acids and antocyanins. Polyphenols are found in its fruits. Elderberry fruits or flowers are traditionally used because of their diuretic and diaphoretic properties, and in the treatment of viral infections, for example influenza. Many studies confirmed the benefits of S. nigra as an antiviral drug but also in the treatment and prevention of diabetes, cardiovascular diseases and cancers. Therefore, elderberry is one of the medicinal plants of particular interest, suitable for pharmaceutical and food purposes. The S. nigra was extracted with hot water for 2 hr. The extract was filtered and dried by freeze dryer. The extracted of each fraction by column chromatography separation (MPLC and prep-HPLC) and HPLC analysis to yield compounds 1-8. The structures of the isolated compounds were identified by analysis of 1D (¹H, <SUP>13</SUP>C, and DEPT) and 2D NMR (COSY, HSQC, and HMBC) and mass spectrometry data (MS), along with comparison with those in the literatures. The structures of these compounds were elucidated as tyrosine (1), N-(1-Deoxy-D-fructos-1-yl)-L-leucine (2), 4-(β-D-glucosyloxy) benzoic acid (3), N-(1-Deoxy-D-fructos-1-yl)-L-tyrosine (4), protocatechuic acid (5), L-Phenylalanine (6), and 2-Hydroxy-4-(2-hydroxyethyl)phenyl β-D-glucopyranoside (7), and rutin (8) on the basis of spectral analysis and comparision with literature values. To the best our knowledge, compounds 2-4, and 7 were obtained from the S. nigra for the first time. HPLC was performed on a Capcell-PAK MGⅡ C18 (4.6 × 250 mm, 5μm) with a gradient elution of 0.1% (v/v) trifluoroacetic acid (TFA) and acetonitrile at a flow rate of 1.0 mL/min at 30℃. The analyte was detected at 355 nm. HPLC was performed by International Conference on Harmonization (ICH) guideline of analytical procedures with respect to specificity, precision, accuracy and linearity. Calibration curve was showed good linearity (R² = 0.99995). The limites of detection and quantitative were 0.0024 and 0.0072 mg/mL, respectively. Precision of analysis was showed less than 2.0%. Recoveries of quantified compounds ranged from 98.09 to 101.37%. From the above results, we established HPLC method is satisfied for the determination of maker compound in S. nigra.
Changon Seo,Seong Su Hong,Jin Gwan Kwon,Dong Wan Seo,Jin Kyu Kim 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.05
Background : Phenolic compounds were isolated from the twig of Broussoneita Kazinoki. Their structures were established on the basis of extensive spectroscopic (MS, 1D , and 2D NMR) data analysis and by comparison with the spectroscopic data reported in the literature. Methods and Results : The twig of B. Kazinoki were extracted 60% aqueous ethanol for 3 days at room temperature. The extract was filtered and concentrated by vacuum evaporator. And then, extract was partitioned using hexane, methylene chloride (MC), ethyl acetate (EtOAc), n-butyl alcohol (BuOH) and H2O, successively. The extraction was separated by using prep-HPLC, and the structure was analyzed by Mass spectrometry (MS) and 1H-, 13C-, 1H-1H COSY, HSQC, HMBC NMR data. Conclusion : These compounds were identified as chlorogenic acid (1), ferulic acid (2), p-coumaric acid (3), taxifolin (4), marmesin (5), 5-methoxy marmesin (6), pinoresinol (7), syringaresinol (8), quercetin (9), broussonin A (10), broussonin B (11), broussoflavonol A (12), broussoflavonol B (13), kazinol A (14), and 5,7,3',4'-tetrahydroxy-3-methoxy-8,5'-diprenylflavone (15).
Isolation and structure of new β-carboline alkaloids from Silene seoulensis
Changon Seo,Seong Su Hong,Jin Gwan Kwon,Yongmun Choi,Jin Kyu Kim 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11
The genus Silene (family Caryophyllaceae) includes several herbaceous plants, which are primarily distributed in the temperate regions of the Northern Hemisphere of Eurasia and America, and Africa. Some species of this family have been used in traditional folk medicine for the treatment of bronchitis, colds, inflammations, and infections, and have also been used as analgesics, antipyretics, diuretics, and emetics. Furthermore, Silene species exhibit a broad range of pharmacological activities, such as antimicrobial, anti-inflammatory, antioxidant, antitumor, antiviral, hepatoprotection, immunomodulatory, and phagocytic activities. Previous phytochemical investigations of the members of this genus have resulted in the isolation of several classes of compounds, which include benzenoids, N-containing derivatives, flavonoids, fatty acids, phytoecdysteroids, triterpene saponins, terpenoids, and sterols. S. seoulensis Nakia is an annual herbaceous plant: it belongs to the Silene genus, and is widely distributed across East Asia, mainly in South Korea. To the best of our knowledge, there has been no report on the phytochemical investigations of S. seoulensis thus far. In this paper, we report the isolation of four new β-carboline alkaloids, called siliendines A-D(1-4), along with three known compounds (5-8), from the EtOH extract of the aerial parts of S. seoulensis using various chromatographic methods, which yielded four new compounds (1-4), as well as two phenolic derivatives (5 and 6), a fatty acid (7), and a flavonoid glycoside (8). The structures of the new compounds were established using multiple spectroscopic approaches, with techniques such as HRESIMS and NMR, which included HSQC and HMBC. The known compounds were identified by comparing their spectra with those of the reported compounds.