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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
Divergence of secondary metabolism in cell suspension cultures and differentiated plants of Piper cernuum and P. crassinervium
The secondary metabolism in the leaves of P. cernuum produces cinnamic and dihydrocinnamic acid derivatives and the lignan cubebin. In case of P. crassinervium flavonoids and prenylated hydroquinonesExpand
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
Application of a New Program, H1MACH, for Prediction of Iridoid Skeletons
Abstract A procedure is presented that utilizes 1H NMR for prediction of the skeleton of iridoids. A new program was developed, named H1MACH, that presents a database with 800 data points from the 1HExpand
Computer-Assisted Approach to Structural Elucidation of Lignans
ABSTRACT This paper reports an expert system (SISTEMAT) developed for structural determination of diverse chemical classes of natural products, including lignans, based mainly on 13C NMR and 1H NMRExpand
Use of an Expert System in Lignan Skeleton Prediction from 1 H NMR Data
Motivation. The identification of natural products is a task that demands skilled spectroscopists in this area. The number of isolated substances has been enhanced significatively in the last years.Expand
Computer-aided Structure Elucidation of Neolignans
A new module of the expert system SISTEMAT used for the prediction of the skeletons of neolignans by 13C NMR, 1H NMR and botanical data obtained from the literature is described, demonstrating its advantage for the structural elucidation of new compounds. Expand