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US 11,987,708 B2Granted
Process for preparing a Lawsonia inermis extract
AssigneePierre Fabre Dermo-Cosmetique
InventorsLaurent Subra, Jean-Marie Autret, Christel Fiorini-Puybaret, Philippe Joulia
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Abstract
The present disclosure relates to a process for preparing a Lawsonia inermis extract which is rich in Lawsone. It also relates to the extract which may be obtained by said process and to a composition comprising thereof. The disclosure also relates to a method for dying fibers, in particular keratin fibers.
Claims16
Process for preparing a lawsone-rich extract which comprises the steps of:
- a) macerating the aerial parts of Lawsonia inermis in water, at a pH ranging from 4 to 8 in order for the glycosylated lawsone derivatives initially present in the aerial parts of Lawsonia inermis to be partially or totally hydrolyzed enzymatically, to provide an aqueous solution containing lawsone;
- b) adding an organic solvent to the solution obtained in step a), said organic solvent being selected from C4-C12 linear, or branched, alcohols to provide an aqueous phase and an organic phase;
- c) collecting the organic phase obtained from step b);
- and
- d) concentrating the organic phase collected in step c) to obtain a lawsone-rich extract.
2 more elements
Dependencies are inferred from the claim text.