Non-nanometric guanine particle powder and its uses in cosmetics
The Couette-Taylor reactor-based process for guanine particles addresses the challenge of removing nanometric particles by ensuring non-nanometric, high-crystallinity guanine particles with preserved coverage properties, suitable for cosmetics.
FR3170340A1Pending Publication Date: 2026-06-26LVMH RECH +1
Patent Information
- Authority / Receiving Office
- FR · FR
- Patent Type
- Applications
- Current Assignee / Owner
- LVMH RECH
- Filing Date
- 2024-12-19
- Publication Date
- 2026-06-26
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Abstract
The present invention relates to a method for preparing, by physicochemical polishing, a powder of non-nanometric guanine particles, all of whose particle dimensions have a minimum size greater than 100 nm and of a unique polymorphic "alpha" shape, characterized in that the method comprises the following steps: suspending the guanine particles (i1) in a basic aqueous solution or alternatively (i2) in an acidic solution, the concentrations of base or alternatively of acid being lower than the concentrations allowing the formation of guanine salts, filtering and recovering said particles, sequential washing of said particles with aqueous solutions of decreasing concentration of base when step (i) is carried out (i1) in a basic medium or alternatively with aqueous solutions of decreasing concentration of acid when step (i) is carried out (i2) in a basic medium, followed by rinsing with water,recovery, notably by filtration, of a powder of non-nanometric particles with a unique polymorphic shape "alpha".
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