Use of nanoscalar water-soluble β-(1,3) glucans
View Patent ↗The invention relates to the use of nanoscalar water-soluble β-(1,3) glucans, which are essentially free from β-(1,6) links and have particle diameters ranging from 10 to 300 nm for producing cosmetic and/or pharmaceutical preparations. When applied topically, the especially fine dispersion of the particles, compared to prior art glucans, facilitates their rapid penetration of both the stratum corneum of the skin and the keratin fibres of the hair.
1. A method for improved glucan resorption in skin or hair comprising applying to the skin or hair a cosmetic composition comprising nanoparticulate water-soluble β-(1,3)-glucans, which have intact β-(1,3) side chains and are free from repetitive β-(1,6) linkages and have particle diameters of about 10 to 300 nm.
2. The method according to claim 1 , comprising glucans based on yeast of the family Saccharomyces.
3. The method according to claim 1 , wherein the nanoparticulate glucans are embedded in a protective colloid.
4. The method according to claim 3 , wherein the protective colloid is selected from the group consisting of polyvinyl alcohol and polyethylene glycol.
5. The method according to claim 1 , wherein the glucan is present in the amount of about 0.1% to about 5% by weight relative to the cosmetic composition.
6. The method according to claim 1 , wherein the nanoparticulate water-soluble β-(1,3)-glucans have improved resorption in skin and hair.
7. The method according to claim 1 , wherein cosmetic composition is a sun radiation protective agent.
8. A method of preparing glucans for use in a cosmetic composition which has improved glucan resorption comprising the steps of:
(a) preparing water-soluble β-(1,3)-glucans, which have intact β-(1,3) side chains and are free from repetitive β-(1,6) linkages and have particle diameters of about 10 to 300 nm, by the process comprising contacting glucan β-(1,3) and β-(1,6) linkages with β-(1,6) glucanases to loosen substantially all β-(1,6) linkages and reducing the size of the resulting glucans into nanoparticulate form, and (b) embedding the nanoparticulate glucans in a protective colloid.
9. The method according to claim 8 , wherein the reduction of the size of the resulting glucans into nanoparticulate form comprises the steps of:
a) dissolving the water-soluble β-(1,3) glucans under supercritical conditions
b) relaxing fluid pressure through a nozzle in a vacuum, gas or liquid, and
c) evaporating the solvent.
10. The method according to claim 9 , wherein the conditions for dissolving the water-soluble solvent are close to critical condition.
11. The method according to claim 8 , wherein the protective colloid is selected from the group consisting of polyvinyl alcohol and polyethylene alcohol.
12. The method according to claim 9 , wherein the glucan is present in the amount of about 0.1% to 5% by weight relative to the cosmetic composition.
13. A cosmetic composition comprising nanoparticulate water-soluble β-(1,3)-glucans, which have intact β-(1,3) side chains and are free from repetitive β-(1,6) linkages and have particle diameters ranging in size from about 10 to 300 nm. embedded in a protective colloid.
14. The cosmetic composition of claim 13 , wherein the glucan is present in the amount of about 0.1% to about 5% by weight.