Stabilized ascorbyl compositions

A - Human Necessities – 01 – N

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Details

A01N 43/08 (2006.01) A61K 8/67 (2006.01) A61K 31/34 (2006.01)

Patent

CA 2273327

Fatty acid esters of ascorbic acid, particularly saturated fatty acid esters such as ascorbyl palmitate, their salts, ascorbic acid and its salts are solubilized in large amounts, e.g., up to about 25 % by weight, and stabilized using special solvent systems. Useful solvents include polyethylene glycol, ethoxydiglycol, propylene glycol, butylene glycol, propylene carbonate, glycerin, a capric glyceride, a caprylic glyceride, an alkyl lactate, an alkyl adipate, an isosorbide, and mixtures thereof. Preferred dermatological compositions made using these solvents with ascorbic acid and/or at least one of its derivatives also include dimethylaminoethanol, tyrosine, proline, cystine, a penetration enhancer such as oleic acid, urea or mixtures thereof, and at least one natural and/or chemical antioxidant. Natural antioxidants that contain at least about 50 % polyphenols and 50 % catachins such as grape seed or green tea extracts are employed in some embodiments.

La présente invention concerne des esters acides gras d'acide ascorbique, en particulier des esters acides gras saturés tels que le palmitate d'ascorbyl, leurs sels, l'acide ascorbique et ses sels que l'on solubilise en grandes proportions, notamment dans une proportion pondérale pouvant atteindre 25 %, puis que l'on stabilise par des systèmes de solvants spéciaux. Parmi les solvants convenant à cette opération, on compte le polyéthylène glycol, l'éthoxydiglycol, le propylène glycol, le butylène glycol, le propylène carbonate, la glycérine, un glycéride caprique, un glycéride octanoïque, un alkyl lactate, un alkyl adipate, un isosorbide et certains de leurs mélanges. Les compositions dermatologiques préférées obtenues en utilisant ces solvants avec de l'acide ascorbique et/ou l'un au moins de ses dérivés contiennent également du diméthylaminoéthanol, de la tyrosine, de la proline, de la cystine, un agent de pénétration tel que l'acide oléique, l'urée, ou certains de leurs mélanges et au moins un antioxydant naturel ou de synthèse. Dans certaines réalisations, on emploie également des antioxydants naturels contenant au moins environ 50 % de polyphénols et 50 % de catachines tels que les pépins de raisin, ou des extraits de thé vert.

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