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Essential oils from Piper cernuum and Piper regnellii: antimicrobial activities and analysis by GC/MS and 13C-NMR.
The essential oils of Piper cernuum and Piper regnellii leaves were analyzed by gas chromatography-mass spectrometry (GC-MS) and the results were compared to that obtained by means of a programExpand
Recent advances in the structure elucidation of small organic molecules by the LSD software
The LSD software code has been improved, so that it recognizes a wider set of atom types to build molecules, and more flexibility has been given in the interpretation of 2D NMR data, including the automatic detection of very long‐range correlations. Expand
A general survey and some taxonomic implications of diterpenes in the Asteraceae
A general survey of the occurrence of diterpenes in the Asteraceae is provided, finding that in the subfamily Cichorioideae, only a few of the studied species possess diter penes, wherein kaurane is the most frequent diterpene skeleton. Expand
Evolution of sesquiterpene lactones in angiosperms
An outline of the evolutionary trends of sesquiterpene lactones in angiosperms is discovered and two parallel pathways in the tribes belonging to two groups of the subfamily Asteroideae are identified. Expand
Flavonoids as chemotaxonomic markers for Asteraceae.
Flavonoids have been shown to be good taxonomic markers for Asteraceae and some implications of flavonols, flavones and other types are discussed for tribes and subtribes of Asteraceae. Expand
Use of self-organizing maps and molecular descriptors to predict the cytotoxic activity of sesquiterpene lactones.
It was concluded that only the geometrical descriptors showed satisfactory values for the cytotoxic activity of sesquiterpene lactones, and important properties for the inhibition potency are discussed for the whole dataset and for subsets of the different structural skeletons. Expand
C-glycosyl flavones from Peperomia blanda.
The methanol extract from aerial parts of the Peperomia blanda (Piperaceae) yielded two C-glycosyl-flavones, which showed only modest activity and the antioxidant activity of both compounds was investigated using the DPPH assay. Expand
Computer-aided method for identification of components in essential oils by 13C NMR spectroscopy
Abstract The aim of this paper is to present a procedure based on analyses of 13 C NMR data for identification of known and new chemical constituents in essential oils. A novel program developed toExpand
Automatic Identification by 13C NMR of Substituent Groups Bonded in Natural Product Skeletons
A procedure that utilizes 13C NMR for identification of substituent groups which are bonded to carbon skeletons of natural products and served to test the prediction of skeletons by using other programs of the expert system SISTEMAT. Expand