Abstract (eng)
The matter in hand thesis emerged on the collaboration of INBio and the University of Vienna.
INBio tested 30 plants on their bioactivity and as a result of this screenings, two of this plants were decided to be investigated on. Base of the research work done were the two purified extracts of Amyris pinnata Kuhnt and Maianthemum palludicola.
The author describes general issues on natural products discovery and special points on the bioprospecting work of INBio, Heredia.
Main focuses on the work were:
1.What is the constitution of the plant's chemical fingerprint and how do the chemical structures look like?
2.Which of the compounds is responsible for the bioactivity measured for this plant?
The Amyris pinnata extract was pre-separated using Medium pressure liquid chromatography (MPLC), gaining 7 main fractions. Each fraction was examined using Thin layer chromatography (TLC) and Nuclear Magnetic Resonance Spectroscopy (NMR) techniques. The gained fractions were further processed by High Performance Liquid Chromatography (HPLC), preparative Thin layer Chromatography and recrystallization methods resulting in 3 purified compounds.
This compounds were analyzed using different NMR experiments with the results being discussed.
The author suggests the three Compounds Scopoletin, Luvangetin and the possibility of Ulupterol, with Luvangetin and Ulupterol being new reported for this plant.
The Maianthemum palludicola extract was separated using a Sephadex LH-20 Chromatography, gaining 154 fractions with each Fraction monitored using Thin layer Chromatography.
A complex mixture of saponins was gained, which were taken to partial acid hydrolysis in order to make a further separation and monitored on Nuclear Magnetic Resonance Spectroscopy.
Due to time issues, the investigation stops at this point and will be readopted by other persons involved in this project.