| 摘要 |
A method for making an extract of a plant of the genus Helichrysum in Jojoba oil or wax, in which a step is provided of joining the Helichrysum, preferably the upper parts of the plant, with a Jojoba wax having an acid number higher than 0.3, in particular higher than 0.32, more in particular higher than 0.36. Such method makes it possible to obtain an extract with a high flavonoid content useful for stimulating the keratinocytes of the epidermis, characterised by a content of Chrysin higher than 80 mg/kg of fatty acids having 20 carbon atoms with one unsaturation, in particular higher than 84 mg/kg, more in particular, higher than 104 mg/kg and/or makes it possible to obtain an extract with a low contained of allergens, characterised by a ratio between the amounts of Limonene and beta- Selinene lower than 0.4, in particular lower than 0.08, more in particular, lower than 0.06. The step of joining is preferably obtained by a dynamic process, for example by percolation or by centrifugation. A medical or cosmetic composition comprising such an extract for treating or preventing a disease and/or a condition that requires a stimulation of cell proliferation of keratinocytes, among which wounds, burns, skin ulcers, scars, skin aging, stretch marks, wrinkles and others. An insect-repellent composition comprising the extract. |
