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Assignment of 1H and 13C spectra and investigation of hindered side‐chain rotation in lupeol derivatives †
Complete 1H and 13C spectral assignments are reported for lupeol (1a) and two derivatives where the C‐30 methyl group is replaced by CH2OH (1b) and HC O (1c). Compound 1c shows conformationallyExpand
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Isolation and identification by 2D NMR of two new complex saponins from Michrosechium helleri
Two complex saponins, amole F and G, were characterized and their spectra were assigned using only 1D and 2D 1H and NMR methods. Amole F and G have seven and six monosaccharides, respectively, linkedExpand
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Pharmacology of Casimiroa edulis IV. Hypotensive effects of compounds isolated from methanolic extracts in rats and guinea pigs.
Bioassay-directed fractionation of the methanolic extract of seeds of Casimiroa edulis led to the isolation of seven constituents with cardiovascular activity, namely the new compound synephrineExpand
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Hypotensive and vasorelaxant effects of the procyanidin fraction from Guazuma ulmifolia bark in normotensive and hypertensive rats.
THE AIM OF THE STUDY was to investigate the in vivo and in vitro cardiovascular activity of a procyanidin fraction (PCF) obtained from acetone extract of Guazuma ulmifolia bark which hasExpand
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Choosing the best pulse sequences, acquisition parameters, postacquisition processing strategies, and probes for natural product structure elucidation by NMR spectroscopy.
The relative merits of different pairs of two-dimensional NMR pulse sequences (COSY-90 vs COSY-45, NOESY vs T-ROESY, HSQC vs HMQC, HMBC vs CIGAR, etc.) are compared and recommendations are made forExpand
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Total assignment of 13C and 1H spectra of three isomeric triterpenol derivatives by 2D NMR: an investigation of the potential utility of 1H chemical shifts in structural investigations of complex
It is shown that a recently proposed indirect heteronuclear shift-correlated pulse sequence, XCORFE, can be used to unambiguously assign the 13C spectra of three isomeric (C30H50O) triterpenols:Expand
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Pharmacology of Casimiroa edulis; III. Relaxant and contractile effects in rat aortic rings.
The relaxant and contractile effects of an aqueous extract of the seeds of the hypotensive plant Casimiroa edulis were investigated in rat aortic rings. The extract inhibited contractions elicited byExpand
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Curcuma treatment prevents cognitive deficit and alteration of neuronal morphology in the limbic system of aging rats
Curcuma is a natural compound that has shown neuroprotective properties, and has been reported to prevent aging and improve memory. While the mechanism(s) underlying these effects are unclear, theyExpand
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1H and 13C NMR characterization of new cycloartane triterpenes from Mangifera indica
From the stem bark of Mangifera indica, seven cycloartane‐type secondary metabolites were isolated. Compound 1 has been isolated for the first time from M. indica, whereas compounds 2 (2a and 2b, asExpand
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