Extraction of essential oils and fixed oils in biphasic or triphasic systems
Different routes depending on the nature and the properties of the solid substrate treated and the more or less hydrophilic nature of the solvent were studied.
The choice of the selected systems is based on studies of solute / solvent / solvent / substrate interactions that take into account :
- the different parameters governing the ionizing and dissociating capacities of the solvents considered,
- the relative diffusion of the liquid phases in the extracted solid materials.
It will be essentially the water-soluble components, particularly the mono, oligosaccharides and proteins that will be extracted with water in a refining operation. The extractions of various hydrates of carbons and functionalized polysaccharides sensitive to steaming are practiced in such a way that the plant support considered is not degraded.
To extract essential oils from aromatic plants by hydrodistillation. The system is apprehended in its phases of extraction, liquid diffusion, steam entrainment, and separation water / aromatic compounds after condensation.
Hydro-organic solvents :
In this case, it is necessary to study the effect of a variable proportion of water in the presence of miscible organic solvents. These operations relate particularly to the dissolution in a more or less hydrated organic hydrophilic solvent of hemicelluloses and lignins present in lignocellulosic materials.
Organic solvents :
The concretes, downstream of the essential oils, extracted by Forane 113 from plants or plant organs are entirely comparable qualitatively with the essential oils extracted by hydrodistillation, with the advantage of leaving a dry and manipulable residue, capable of subsequent recovery.
In this way, the essential oils of many plants of temperate and tropical zones have been studied and characterized.
Phytochemical analysis and anti-malarial activity of Evodia – Fatraïna – Madagascar
Evodia-Fatraïna is a rutaceae widely used in anti-malarial medication in Madagascar against Plasmodium falciparium. The ethanolic and chloroformic crude extracts made it possible to separate active fractions in vitro against chloroquine-resistant strains. It is essentially 3-furoquinolines including bergaptenene which are at the origin of this activity. This is the first mention of antimalarial activity, for molecules of this kind, which could be optimized by semisynthesis given the apparent importance of the positioning of the methoxyl group on this type of activity for these molecules.
The study of different dyeing plants has made it possible to select Garance, Pastel ( Indogofera tinctorial) and Lampourde as sources of 3 primary colors (red, blue, yellow).
The optimization of the extraction conditions of the dyeing principles, in the case of pastel for example, has allowed the first indigo, indirect, separation in the pastel.
A study conducted on fiber-dye interaction phenomena provides a better understanding of the difference in behavior between the synthetic dye and the natural dye in terms of resistance to light and aging.