Use of extracts of the
Extracts of the plant Cassia alata are used in cosmetic and/or dermatological skin care preparations. These preparations possess antioxidative and anti-inflammatory properties and exhibit preventive and curative effect on skin aging.
1. An extract of leaves of Cassia alata produced by a process comprising heating the leaves in water at 85-90° C. for 1 hour and separating a supernatant liquid extract from insoluble residue, thereby obtaining the extract.
2. The extract of claim 1 , wherein the process further comprises spray drying or freeze drying the supernatant liquid extract.
3. The extract of claim 1 which comprises kaempferol-3-O-sophoroside.
4. A skin care composition comprising the extract of claim 1 .
5. The skin care composition of claim 4 which comprises 0.001 to 25%, 0.01 to 5%, or 0.05 to 1.5% by weight of the extract.
6. The skin care composition of claim 5 which further comprises 1 to 50% by weight auxiliaries and additives.
7. The skin care composition of claim 4 which is a composition for topical application.
8. The skin care composition of claim 7 which is in the form of a cream or lotion.
9. A method of protecting skin cells from UV-induced damage comprising applying to skin exposed to UV light a skin care composition comprising an extract of leaves of Cassia alata , wherein the extract is produced by a process comprising heating the leaves in water at 85-90° C. for 1 hour and separating a supernatant liquid extract from insoluble residue, thereby obtaining the extract.
10. The method of claim 9 , wherein wrinkling and/or lining of the skin is reduced.
11. The method of claim 9 , wherein apoptosis in the skin cells is reduced.
12. The method of claim 9 , wherein inflammation of the skin is reduced.
13. A method of regenerating fibroblasts in skin comprising applying to the skin a composition comprising an extract of leaves of Cassia alata , wherein the extract is produced by a process comprising heating the leaves in water at 85-90° C. for 1 hour and separating a supernatant liquid extract from insoluble residue, thereby obtaining the extract, and wherein the composition is applied in an amount sufficient to stimulate glycosaminoglycan synthesis in skin fibroblasts.
14. A method for extracting kaempferol-3-O-sophoroside from leaves of Cassia alata comprising heating the leaves in water at 85-90° C. for 1 hour and separating a supernatant liquid extract from insoluble residue, thereby obtaining the extract.
15. The method of claim 14 , further comprising spray drying or freeze drying the extract.