Showing papers by "Angelo C. Pinto published in 1995"
Journal Article•
15 citations
Journal Article•
14 citations
TL;DR: In this paper, six diterpenes with the cleistanthane skeleton have been identified from Vellozia flavicans, three of which are reported as natural products.
12 citations
TL;DR: In this paper, a method for direct analysis of crude or prefractioned apolar or medium-polar extracts by high-resolution gas chromatography and computerized high resolution GC-mass spectrometry is described.
Abstract: Characterization of individual components in plant extracts through classical phytochemical methods is a multi-step procedure which is both costly and time-consuming. Also significant amounts of extract are required and detection of minor compounds is frequently not possible. The method described in this work involves direct analysis of crude or prefractioned apolar or medium-polar extracts by high-resolution gas chromatography and computerized high resolution gas chromatography-mass spectrometry, followed by co-injections of the crude extract with certified standards on capillary columns of different polarities. The effectiveness of the method is illustrated for several species of Polypodiaceae (spores and rhizomes). allowing easy monitoring of compound-type distributions (e.g. triterpenes) and detection of structures present at trace levels (for example, 22,29,30-trisnorhopane).
11 citations
TL;DR: In this article, the isolation of the first diterpene with a totarane skeleton from the Velloziaceae family is described, which is the first known diterpenes with a skeleton.
Abstract: The isolation of the first diterpene with a totarane skeleton from the Velloziaceae family is described.
5 citations