Flavonoid complexes with cyclodextrins
The invention relates to complexes of certain flavonoid derivatives, of the formula I compositions which comprise such derivatives, corresponding processes for the preparation of the flavonoid derivatives or of compositions comprising same, and the use thereof, in particular for the care, preservation or improvement of the general state of the skin or hair. Formula (1), in which Z 1 to Z 4 and Z 6 to Z 10 each, independently of one another, denote H, OH, CH 3 COO, alkoxy, hydroxyalkoxy, mono- or oligoglycoside radicals and where the alkoxy and hydroxyalkoxy groups may be branched and unbranched and can have 1 to 18 C atoms. Formula (II) denotes, Z 5 is a mono- or the oligoglycoside radical, where bonded to this glycoside radical, in each case via an —O— group, is at least one radical selected from certain benzo molecule.
1. A complex compound of the following formula
wherein
CD is a gamma-cyclodextrin,
o is 1, and
p is 2.
2. A complex compound according to claim 1 , wherein the gamma-cyclodextrin is C 1-24 -alkyl- or C 1-24 -hydroxyalkyl-substituted on one or more hydroxyl groups.
3. A complex compound according to claim 1 , wherein the gamma-cyclodextrin is hydroxypropyl-gamma-cyclodextrin.
4. A composition comprising a complex compound of claim 1 and an excipient.
5. A composition according to claim 4 , which comprises one or more antioxidants and/or one or more UV filters.
6. A composition according to claim 4 , which comprises one or more further active ingredients having a skin-care and/or inflammation-inhibiting action.
7. A composition according to claim 4 , which further comprises one or more glucocorticoids or tacrolimus.
8. A method for the therapy of eczema, comprising administering to a subject in need thereof a complex compound according to claim.
9. A method according to claim 8 , wherein the eczema is atopic eczema, milk crust, neurodermatitis, prurigo or dermatitis sicca.
10. A method for the care, preservation or improvement of the general state of the skin or hair, comprising administering to a subject in need thereof a complex compound according to claim 1 .
11. A process for preparing a complex compound according to claim 1 , comprising reacting a compound of formula IIA1
with CD, which is a gamma-cyclodextrin, in a solution.
12. A process according to claim 11 , wherein the gamma-cyclodextrin is hydroxypropyl-gamma-cyclodextrin.
13. A process for preparing a composition according to claim 4 , comprising mixing the complex compound with an excipient.