Crosslinked hyaluronic acid in emulsion

C - Chemistry – Metallurgy – 08 – B

Patent

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Details

C08B 37/00 (2006.01) C08L 5/08 (2006.01)

Patent

CA 2709824

The present invention relates to methods of producing crosslinked hyaluronic acid microbeads, as well as the pro-duced microbeads, said method comprising the steps of: (a) mixing an aqueous alkaline solution comprising hyaluronic acid, or a salt thereof, with a solution comprising a crosslinking agent; (b) forming microdroplets having a desired size from the mixed so-lution of step (a) in an organic or oil phase to form a water in organic or water in oil (W/O) emulsion; (c) continuously stirring the W/O emulsion, whereby the reaction of hyaluronic acid with divinylsulfone takes place to provide crosslinked hyaluronic acid microbeads; and (d) purifying the crosslinked hyaluronic acid microbeads.

La présente invention porte sur des procédés de fabrication de microbilles d'acide hyaluronique réticulé, ainsi que sur les microbilles obtenues. Ce procédé consiste : (a) à mélanger une solution aqueuse alcaline comprenant de l'acide hyaluronique, ou un sel de celui-ci, avec une solution comprenant un agent réticulant ; (b) à former des microgouttelettes ayant une dimension souhaitée à partir de la solution mélangée de l'étape (a) dans une phase organique ou huileuse pour former une émulsion d'eau dans la phase organique ou d'eau dans l'huile (E/H) ; (c) à agiter en continu l'émulsion E/H, la réaction de l'acide hyaluronique avec la divinylsulfone ayant lieu pour fournir des microbilles d'acide hyaluronique réticulé ; et (d) à purifier les microbilles d'acide hyaluronique réticulé.

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