Stigmasteryl galactoside from Rhynchosia minima

Ahmed, Wasim; Ahmad, Zaheer; Malik, Abdul

doi:10.1016/s0031-9422(00)97583-6

Cited by 30 publications

(26 citation statements)

References 13 publications

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“…From gCOSY, gTOCSY, gHMQC, and gHMBC experiments, it was possible to assign more feasible δ values for carbons and hydrogens, including C-3, C-1' to C-6' and H-3, H-1' to H-6', than those previously described in the literature 29 . The structure was further confirmed by acid hydrolysis, as reported by Ahmed et al 30 , affording sitosterol and glucose.…”

Section: Resultssupporting

confidence: 70%

Alkamides and phenethyl derivatives from Aristolochia gehrtii

Navickiene¹,

Lopes²

2001

J. Braz. Chem. Soc.

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Foram isolados de galhos de Aristolochia gehrtii a cis-N-feruloil-3-O-metildopamina, um derivado hemiacetálico do 5-hidroximetilfurfural, e vinte e dois compostos conhecidos. Entre estes compostos estão cinco lignanas, três terpenos, seis alcalóides dos quais cinco são alcamidas, dois derivados do ácido benzóico e seis derivados constituídos pelo grupo feniletil. As estruturas dos compostos isolados foram determinadas por métodos espectroscópicos e comparação de dados físicos e espectroscópicos dos compostos com aqueles disponíveis na literatura.From the stems of Aristolochia gehrtii, the cis-N-feruloyl-3-O-methyldopamine and a hemiacetal derivative of 5-hydroxymethylfurfural were isolated, together with twenty-two known compounds. These compounds include five lignans, three terpenes, six alkaloids (five alkamides), two benzoic acid derivatives, and six phenethyl derivatives. The structures of the isolated compounds were determined by means of spectroscopic methods and comparison with literature data.

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Section: Resultssupporting

confidence: 70%

Alkamides and phenethyl derivatives from Aristolochia gehrtii

Navickiene¹,

Lopes²

2001

J. Braz. Chem. Soc.

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“…On the basis of above evidences compound-5 was identified as a β-sitosterol. Finally its identity was confirmed by comparison of its spectral data with those reported in literature [11] and also comparison by Co-TLC with authentic sample.…”

Section: Characterization Of Compound-5supporting

confidence: 60%

Isolation and Characterization of Bioactive Terpenoids from the Leaves of Ceriops tagal Linn

Lakshmi¹,

Mahdi²,

Sk³

et al. 2017

Herb Med

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Plants have been used for medicine from time immemorial because they have fitted the immediate personal need and are easily accessible. These are inexpensive too. In the recent past there has been a tremendous increase in the use of plant based health products in developing as well as developed countries, resulting in an exponential growth of herbal products globally. Herbal medicines have a strong traditional or conceptual base and the potential to be useful as drugs in terms of safety and effectiveness leads for treating different diseases. There are not much chemical investigations on this plant.Ceriops tagal Linn. is a mangrove plant. The leaves of the plant were air dried and dried leaves were used for the detailed chemical and biological investigation. The leaves were extracted with ethanol and the ethanol extract showed promising antidiabetic activity (PTPase inhibitory activity). This prompted us to take up detailed chemical investigation on this plant. We have isolated 12 chemical molecules from the bioassay guided fraction for the location of biological activity. Four molecules [(Stearic acid (94.2%) Betulin (94.4%) (β-hydroxy betulinic acid 90.5%) and (ursolic acid 91.6%)] showed promising PTPase activity at 100 μg/ml.

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“…Comparações dos deslocamentos de RMN de 13 C de 3 e 5 com a literatura (Olea e Roque, 1990;Mahato e Kundu, 1994;Castilho e Kaplan, 2008) O espectro de RMN de 1 H da mistura das substâncias 4a e 4b apresentou sinais entre δ H 0,62-2,40 correspondentes a grupos metílicos de esteróides, um multipleto em δ H 3,54 (H-3) e sinais em δ H 5,02, 5,16 (dd, H-22 e H-23, 4b) e 5,36 (dl, H-6, 4a+4b) de hidrogênios olefínicos. Estes dados, aliados à análise do espectro de RMN de 13 C da mistura e comparação com dados da literatura (Goulart et al, 1993;Ahmed et al, 1992) permitiram identificar as estruturas do sitosterol (4a) e estigmasterol (4b).…”

Section: Resultsunclassified

Constituintes químicos, fenóis totais e atividade antioxidante de Sterculia striata St. Hil. et Naudin

et al. 2010

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A investigação fitoquímica das cascas do caule de Sterculia striata St. Hil. et Naudin, através de métodos cromatográficos, conduziu ao isolamento dos esteróides sitosterol, estigmasterol e sitosterol-3-O-β-D-glicopiranosídeo, além de quatro triterpenóides pentacíclicos, o lupeol, 3-β-O-acil lupeol, lupenona e ácido betulínico. As estruturas desses compostos foram identificadas por análise dos espectros de RMN 1 H e 13 C e comparações com dados da literatura. Para determinação do teor de fenóis totais do extrato etanólico de S. striata utilizou-se o reativo Folin Ciocalteu, enquanto na avaliação da atividade antioxidante empregou-se o radical livre DPPH. Este é o primeiro trabalho descrevendo o estudo químico com as cascas do caule desta espécie. PALAVRAS-CHAVE:Sterculia striata, esteróides, triterpenóides, atividade antioxidante. Chemical constituents, total phenolics and antioxidant activity of Sterculia striata St. Hil. et Naudin ABSTRACTThe phytochemical investigation of the stem bark of Sterculia striata St. Hil. et Naudin by chromatographic methods led to the isolation of sitosterol, stigmasterol and sitosterol-3-O-β-D-glucopyranoside, besides pentacyclic triterpenoids, lupeol, 3-β-O-acyl-lupeol, lupenone and betulinic acid. The structures of these compounds were identified by 1 H and 13 C NMR spectral data analysis and comparison with literature data. For determining of the phenolic content of the etanolic extract of Sterculia striata we used the Folin Ciocalteu reagent, and for the evaluation of antioxidant activity, we utilized the DPPH free radical. This is the first work reporting the chemical study with the stem bark of this species.

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Stigmasteryl galactoside from Rhynchosia minima

Cited by 30 publications

References 13 publications

Alkamides and phenethyl derivatives from Aristolochia gehrtii

Alkamides and phenethyl derivatives from Aristolochia gehrtii

Isolation and Characterization of Bioactive Terpenoids from the Leaves of Ceriops tagal Linn

Constituintes químicos, fenóis totais e atividade antioxidante de Sterculia striata St. Hil. et Naudin

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