scholarly journals Flavonoids from the bark of Garcinia lanessanii Pierre

2021 ◽  
Vol 5 (2) ◽  
pp. first
Author(s):  
Ly Thi Thao Nguyen ◽  
Thai Le Tran ◽  
Dung Ngoc Bui ◽  
Thai Quoc Bui ◽  
Le-Thu Thi Nguyen ◽  
...  
Keyword(s):  
2D Nmr ◽  
Biological Study ◽  
National Forest ◽  
Viet Nam ◽  
Tooth Decay ◽  
The World ◽  
2D Nmr Spectra ◽  
Chemical Knowledge ◽  
First Time ◽  
Layer Chromatography

Garcinia lanessanii Pierre belongs to the genus Garcinia of the Guttiferae (Clusiaceae) family. In Cambodia, people use this species to cure sore throat and tooth decay. However, chemical and biological study of this species has been not reported in the world until now. To contribute to chemical knowledge of the genus Garcinia in Viet Nam, we chemically investigated the species Garcinia lanessanii Pierre. The bark of this plant collected in the National Forest Lo Go – Xa Mat, Tan Bien ward, Tay Ninh province was dried, ground into powder and extracted in turn with n-hexane, chloroform and ethyl acetate solvents by using a Sohxlet system. Four flavonoids were isolated from the ethyl extract of G. lanessanii Pierre using column and thin layer chromatography on silica gel, RP-18 and Sephadex LH-20 with different solvents. Based on the analysis of 1D and 2D NMR spectra as well as comparison with literature, the structures of these compounds were elucidated as a flavanone, naringenin (1); two biflavonoids, volkensiflavone (2) and GB-2 (3), together with a biflavonoid glycoside, volkensiflavone-7-O-rhamnopyranoside (4). These compounds were isolated from G. lanessanii Pierre for the first time.

scholarly journals SOME GLYCOSIDES ISOLATED FROM DESMODIUM GANGETICUM (L.) DC. OF VIET NAM

2018 ◽  
Vol 56 (2A) ◽  
pp. 99-103
Author(s):  
Le Minh Ha
Keyword(s):  
Nmr Spectra ◽  
Protocatechuic Acid ◽  
Methanol Extract ◽  
2D Nmr ◽  
The Other ◽  
Viet Nam ◽  
2D Nmr Spectra ◽  
First Time

From the methanol extract of the leaves of Desmodium gangeticum collected in Me Linh, Ha Noi, we isolated 5 compounds. In which, there are four glycosides including (6S,9R)-roseoside (1), kaempferol-3-O-rutinoside (nicotiflorin) (2),  quercetin-3-O-rutinoside (rutin) (3), β-sitosterol-3-O- β-D-glucopyranoside (4), and the other is protocatechuic acid (5). Kaempferol-3-O-rutinoside (2) was isolated from Desmodium gangeticum for the first time while (6S,9R)-roseoside (1) was isolated from the genus Desmodium for the first time. Their structures were determined by 1D and 2D NMR spectra.

scholarly journals Mammals of the Saracá-Taquera National Forest, northwestern Pará, Brazil

2018 ◽  
Vol 18 (4) ◽  
Author(s):  
Analice Calaça ◽  
Michel Barros Faria ◽  
Diego Afonso Silva ◽  
Áquila Oliveira Fialho ◽  
Fabiano Rodrigues de Melo
Keyword(s):  
Species Richness ◽  
Geographic Distribution ◽  
Mammalian Species ◽  
National Forest ◽  
Large Mammals ◽  
Mammalian Fauna ◽  
The World ◽  
Amazonian Rainforest ◽  
Mammal Faunas ◽  
First Time

Abstract: The Amazonian rainforest harbors one of the most diverse mammal faunas found anywhere in the world, although this fauna is still poorly known. Inventories are essential for the understanding of the biology and ecology of species, and provide basic data for conservation. Over 15 years of sampling in the Saracá-Taquera National Forest, we recorded 72 species of small (nonvolant), medium, and large mammals belonging to 30 families in 10 orders. These taxa included 29 species endemic to the Amazon biome, and 14 classified as threatened with extinction. Overall, the mammalian species richness recorded in the present study was equal to or greater than that recorded in other Amazonian studies, reflecting high levels of diversity on a biogeographic scale. This reinforces the importance of this national forest for the maintenance of the region's mammalian fauna. Some of the species were recorded in the region for the first time, thus extending their known geographic distribution.

scholarly journals Antialactone: A New γ-Lactone from Antiaris Africana, and its Absolute Configuration Determined from TDDFT CD Calculations

2008 ◽  
Vol 3 (2) ◽  
pp. 1934578X0800300 ◽  
Author(s):  
Vouffo Bertin ◽  
Hidayat Hussain ◽  
Simeon F. Kouam ◽  
Etienne Dongo ◽  
Gennaro Pescitelli ◽  
...  
Keyword(s):  
Natural Product ◽  
Absolute Configuration ◽  
Betulinic Acid ◽  
Spectroscopic Data ◽  
Nmr Spectra ◽  
2D Nmr ◽  
Stem Bark ◽  
Cd Spectra ◽  
2D Nmr Spectra ◽  
First Time

Four compounds were isolated from the stem bark of Antiaris africana. One of them, a γ-lactone named antialactone (1a), is reported for the first time as a natural product. The structures were determined by comprehensive analyses of their 1D and 2D NMR spectra and EI MS data. The absolute configuration of antialactone acetate (1b) was established by TDDFT CD calculations and comparison with measured CD spectra. The remaining three known compounds were identified, by comparing their spectroscopic data with those reported in the literature, as lichenxanthone, β-sitosterol, and betulinic acid.

Study on Chemical Constituents of the Vietnamese Medicinal Plant Fissistigma petelotii

2009 ◽  
Vol 64 (3) ◽  
pp. 323-327 ◽  
Author(s):  
Tran Thi Phuong Thao ◽  
Nguyen Vu Anh ◽  
Ho Ngoc Anh ◽  
Tran Duc Quan ◽  
Tran Van Sung
Keyword(s):  
Medicinal Plant ◽  
Cinnamic Acid ◽  
Nmr Spectra ◽  
Chemical Constituents ◽  
Methyl Elaidate ◽  
2D Nmr ◽  
Methyl Cinnamate ◽  
2D Nmr Spectra ◽  
First Time

A new bisabolene derivative (1S*, 2R*, 4R*, 7R*, 10R*)-1,7,10,11-tetrahydroxy-1,7,11-trimethyl- 4,10(H)-2-O-cinnamoyl-bisabol-8(9)-ene (1), together with cinnamic acid (2), methyl cinnamate (3), sodium cinnamate (4) and methyl elaidate (5) have been isolated from the leaves and barks of Fissistigma petelotii. Sodium cinnamate (4) was isolated for the first time from the nature. The structures of these compounds were elucidated by analysis of their IR, MS, 1D and 2D NMR spectra.

scholarly journals Isolation of Cycloeucalenol from Boophone Disticha and Evaluation of its Cytotoxicity

2013 ◽  
Vol 8 (9) ◽  
pp. 1934578X1300800 ◽  
Author(s):  
Emmanuel Adekanmi Adewusi ◽  
Paul Steenkamp ◽  
Gerda Fouche ◽  
Vanessa Steenkamp
Keyword(s):  
Preparative Thin Layer Chromatography ◽  
2D Nmr ◽  
Neutral Red ◽  
Literature Report ◽  
Human Neuroblastoma ◽  
H Nmr ◽  
Low Toxicity ◽  
Dose Dependent Decrease ◽  
First Time ◽  
Layer Chromatography

Boophone disticha (Amaryllidaceae) is widely used in traditional medicine in southern Africa. Several alkaloids, volatile oils and fatty acids have been isolated from the plant. However, there has been no literature report of a triterpene from B. disticha. Cycloeucalenol, a cycloartane triterpene, together with its regio-isomer, was isolated from the ethyl acetate extract of the bulbs using column chromatography and preparative thin layer chromatography. Structural elucidation was carried out using 1D and 2D NMR and mass spectroscopy. The MTT and neutral red assays were used to assess the cytotoxicity of the compound in human neuroblastoma (SH-SY5Y) cells. The compound was obtained as a mixture of two regio-isomers, which were separated for the first time by chromatographic optimization. Integration of the 1H NMR spectrum showed that cycloeucalenol and its regio-isomer were present in a ratio of 1.04:1. A dose-dependent decrease in cell viability was observed using both cytotoxicity assays. IC50 values of 173.0 ± 5.1 μM and 223.0 ± 6.4 μM were obtained for the MTT and neutral red assays, respectively, indicative of the low toxicity of the compound. This work describes for the first time, the presence of triterpene compounds from the genus Boophone.

scholarly journals CHEMICAL CONSTITUENTS FROM POLYGONATUM KINGIANUM COLL. ET HEMSL. OF VIETNAM

2020 ◽  
Vol 58 (5) ◽  
pp. 549
Author(s):  
Lê Minh Hà
Keyword(s):  
Spectral Data ◽  
Nmr Spectra ◽  
Chemical Constituents ◽  
Dienoic Acid ◽  
2D Nmr ◽  
Ergosterol Peroxide ◽  
2D Nmr Spectra ◽  
First Time

Seven compounds, including two homoisoflavanones 3-(2ʹ-hydroxy-4ʹ-methoxy-benzyl)-5,7-dihydroxy-8-methyl-chroman-4-one (1), disporopsin (2) along with 2-O-methyl-α-D-fructofuranose (3), (E,E)-9-oxooctadeca-10,12-dienoic acid (4), 1-palmitoylglycerol (5), 5α,8α-ergosterol  peroxide (6),  daucosterol (7) were isolated from the rhizomes of Polygonatum kingianum of Vietnam. Their structures were determined by 1D and 2D NMR spectra and by comparison with the reported spectral data. Compounds 3, 4 and 6 are first reported from the genus Polygonatum. Compound 1 and 5 are reported for the first time from Polygonatum kingianum.

scholarly journals Four flavonols from the seed of Hibiscus sabdariffa. Linn. growing in Binh Thuan Province

2019 ◽  
Vol 22 (4) ◽  
pp. 348-351
Author(s):  
Pham Nguyen Kim Tuyen ◽  
Truong Van Tien ◽  
Tran The Anh Huy ◽  
Nguyen Thi Hoa ◽  
Huynh Bui Linh Chi ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Ethyl Acetate Extract ◽  
2D Nmr ◽  
Hibiscus Sabdariffa ◽  
Asian Countries ◽  
Chromatography Analysis ◽  
Liquid Liquid Extraction ◽  
Nmr Data ◽  
First Time ◽  
Layer Chromatography

Introduction: Hibiscus sabdariffa Linn. (Malvaceae) is a medicinal plant popularly distributed in Asian countries. As of 2019, no chemical investigations from the Vietnamese plant were found. This paper reported the isolation and elucidation of compounds isolated from the seeds of Hibiscus sabdariffa Linn. (Malvaceae) growing in Binh Thuan province. Method: The maceration was applied to the seeds of the plant to afford the crude extract which was then fractionated by liquid-liquid extraction to obtain the ethyl acetate extract. The extract was carried out by using normal phase silica gel column chromatography and thin-layer chromatography. Analysis of spectroscopic data including HR-ESI-MS, 1D and 2D-NMR and a comparison of the NMR data with that in the literature led to the structural elucidation of isolated compounds. Results: Four flavonols comprising quercetin 3-O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (1), quercetin 3-O-β-D-glucopyranoside (2), quercetin (3) and kaempferol (4) were isolated from the ethyl acetate extract. Conclusions: This is the first time the isolated compounds were found from the seeds of this plant.

scholarly journals A New Flavonol Glucoside from the Leaves of Crypsinus trilobus

2018 ◽  
Vol 13 (12) ◽  
pp. 1934578X1801301
Author(s):  
Pham Thi Bich Hanh ◽  
Ngo Thi Phuong ◽  
Le Ngoc Hung ◽  
Nguyen Quoc Dat ◽  
Dang Minh Tri ◽  
...  
Keyword(s):  
Nmr Spectra ◽  
2D Nmr ◽  
Esi Ms ◽  
2D Nmr Spectra ◽  
First Time

A new flavonol glucoside, kaempferol 3- O-[2″,4″-di- O-acetyl-6″- O-( E- p-coumaroyl)]-β-D-glucopyranoside (namely crypsinoside A) (1), along with 7 known compounds 2 – 8 were isolated from the leaves of Crypsinus trilobus (Houtt.) Copel. (Polypodiaceae) for the first time. Their structures were elucidated on the basis of HR-ESI-MS, 1D and 2D NMR spectra.

scholarly journals Flavone glycosides from Uraria crinita

2021 ◽  
Vol 63 (2) ◽  
pp. 3-6
Author(s):  
Tran Duc Dai ◽  
◽  
Dao Duc Thien ◽  
Nguyen Thanh Tam ◽  
◽  
...  
Keyword(s):  
Nmr Spectra ◽  
2D Nmr ◽  
Butanol Extract ◽  
Flavone Glycosides ◽  
Whole Plant ◽  
2D Nmr Spectra ◽  
First Time

Four flavone glycosides including apigenin 7-O-β-glucoside (1), chrysoeriol 7-O-β-glucoside (2), rhoifolin (3), and 3′-methoxyapiin(4) were isolated from the n-butanol extract of the whole plant Uraria crinita collected in the phu Tho province, Vietnam. Their structures were elucidated by 1D- and 2D-NMR spectra and compared with those reported in the literature. Compounds 1-3 were obtained from the genus Uraria for the first time.

scholarly journals Isolation and characterization of components from roots of Premna latifolia Roxb

2019 ◽  
Vol 10 (3) ◽  
pp. 2259-2264
Author(s):  
Gowtham M ◽  
Asharani I V ◽  
Paridhavi M
Keyword(s):  
Thin Layer ◽  
13C Nmr ◽  
Preparative Thin Layer Chromatography ◽  
2D Nmr ◽  
Plant Roots ◽  
Isolation And Characterization ◽  
The Individual ◽  
First Time ◽  
Layer Chromatography

The aim of the current work was to isolate and characterize structurally fascinating and biologically intriguing compounds from the dried roots of Premna latifolia. Dried plant roots were subjected to soxhalation with ethyl alcohol and later to column chromatography. The individual compounds were isolated by preparative thin-layer chromatography followed by structural characterization using various spectral ways like LCMS, IR, 1D-NMR and 2D-NMR (1H-1H NMR and 1H-13C NMR). Three totally different compounds were isolated and characterised as Compound 1: n-Tridecanyl n-Tetracosanoate, Compound 2: Stigmanstan -3β-olyln-octadec-9ʹ, 12ʹ-dienoate and Compound 3: n-Tetracosanol for the first time from Premna latifolia roots.

Sign in / Sign up

Export Citation Format

Share Document