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 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 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 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 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 New Phenolic Glycosides from Physalis angulata

2016 ◽  
Vol 11 (12) ◽  
pp. 1934578X1601101 ◽  
Author(s):  
Hoang Le Tuan Anh ◽  
Duong Thi Dung ◽  
Do Thanh Tuan ◽  
Bui Huu Tai ◽  
Nguyen Xuan Nhiem ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Nmr Spectra ◽  
2D Nmr ◽  
Phenolic Glycosides ◽  
Esi Ms ◽  
Chemical Structures ◽  
Whole Plant ◽  
2D Nmr Spectra ◽  
Physalis Angulata

Two new phenolic glycosides, physangulosides A and B (1 and 2), were isolated from the whole plant of Physalis angulata. Their chemical structures were determined by mean of HR-ESI-MS, 1D, and 2D-NMR spectra. Both of the compounds showed weak protection against hydrogen peroxide induced hepatocytes damage.

scholarly journals CONTRIBUTE TO STUDY ON CHEMICAL CONSTITUENTS OF DESMODIUM GANGETICUM (L.) DC. OF VIETNAM

2019 ◽  
Vol 57 (1) ◽  
pp. 1
Author(s):  
Le Minh Ha ◽  
Ngo Thi Phuong ◽  
Do Thi Thanh Huyen ◽  
Duong Bich Ngoc ◽  
Nguyen Minh Nguyet ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Nmr Spectra ◽  
Ethyl Acetate Extract ◽  
Chemical Constituents ◽  
2D Nmr ◽  
2D Nmr Spectra ◽  
First Time

From the ethyl acetate extract of the leaves of Desmodium gangeticum collected in Me Linh, Ha Noi, we isolated 5 compounds including luteolin (1), luteolin tetramethyl ether (2),  N,N-dimethyl tetradecane-1-amin (3), D-pinitol (4)  and stigmasterol (5). In which, luteolin (1) was isolated from Desmodium gangeticum for the first time, luteolin tetramethyl ether (2) and  N,N-dimethyl tetradecane-1-amin (3) were first isolated from genus Desmodium. Their structures were determined by 1D and 2D NMR spectra.

Differential Analysis of 2D NMR Spectra: New Natural Products from a Pilot-Scale Fungal Extract Library

2007 ◽  
Vol 46 (6) ◽  
pp. 901-904 ◽  
Author(s):  
Frank C. Schroeder ◽  
Donna M. Gibson ◽  
Alice C. L. Churchill ◽  
Punchapat Sojikul ◽  
Eric J. Wursthorn ◽  
...  
Keyword(s):  
Natural Products ◽  
Nmr Spectra ◽  
2D Nmr ◽  
Pilot Scale ◽  
Differential Analysis ◽  
Fungal Extract ◽  
2D Nmr Spectra

scholarly journals New Antimalarial and Antimicrobial Tryptamine Derivatives from the Marine Sponge Fascaplysinopsis reticulata

Marine Drugs ◽  
2019 ◽  
Vol 17 (3) ◽  
pp. 167 ◽  
Author(s):  
Pierre-Eric Campos ◽  
Emmanuel Pichon ◽  
Céline Moriou ◽  
Patricia Clerc ◽  
Rozenn Trépos ◽  
...  
Keyword(s):  
Plasmodium Falciparum ◽  
Minimum Inhibitory Concentration ◽  
Marine Sponge ◽  
Nmr Spectra ◽  
Inhibitory Concentration ◽  
Chemical Study ◽  
2D Nmr ◽  
Antimicrobial Activities ◽  
2D Nmr Spectra ◽  
Ic50 Values

Chemical study of the CH2Cl2-MeOH (1:1) extract of the sponge Fascaplysinopsis reticulata collected in Mayotte highlighted three new tryptophan derived alkaloids, 6,6′-bis-(debromo)-gelliusine F (1), 6-bromo-8,1′-dihydro-isoplysin A (2) and 5,6-dibromo-8,1′-dihydro-isoplysin A (3), along with the synthetically known 8-oxo-tryptamine (4) and the three known molecules from the same family, tryptamine (5), (E)-6-bromo-2′-demethyl-3′-N-methylaplysinopsin (6) and (Z)-6-bromo-2′-demethyl-3′-N-methylaplysinopsin (7). Their structures were elucidated by 1D and 2D NMR spectra and HRESIMS data. All compounds were evaluated for their antimicrobial and their antiplasmodial activities. Regarding antimicrobial activities, the best compounds are (2) and (3), with minimum inhibitory concentration (MIC) of 0.01 and 1 µg/mL, respectively, towards Vibrio natrigens, and (5), with MIC values of 1 µg/mL towards Vibrio carchariae. In addition the known 8-oxo-tryptamine (4) and the mixture of the (E)-6-bromo-2′-demethyl-3′-N-methylaplysinopsin (6) and (Z)-6-bromo-2′-demethyl-3′-N-methylaplysinopsin (7) showed moderate antiplasmodial activity against Plasmodium falciparum with IC50 values of 8.8 and 8.0 µg/mL, respectively.

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