Efficient process for purification of high molecular weight...

C - Chemistry – Metallurgy – 12 – P

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C12P 19/26 (2006.01) C08B 37/00 (2006.01)

Patent

CA 2657162

The present invention provides an efficient and inproved process for the production and purification of high molecular weight hyaluronic acid (HA). One embodiment relates to providing growth conditions for production of high molecular weight HA in Streptococcus zooepidemicus. For example, growth in medium comprising a lower protein concentration, e.g., 1% casein hydrolyzate, and a higher sugar concentration, e.g., 5% sucrose, gave 5-6 g/L of high molecular weight HA in the range of 3.5-4.0 x 106 Da. The present invention also provides an efficient process for the purification of HA comprising treatment with silica gel then active carbon, and subsequent diafiltration with less volume of solvent.

La présente invention concerne un procédé efficace et amélioré de production et de purification d'acide hyaluronique (AH) à poids moléculaire élevé. Un mode de réalisation concerne des conditions de croissance permettant la production d'AH à poids moléculaire élevé dans Streptococcus zooepidemicus. La mise en croissance dans un milieu contenant une concentration protéinique plus faible, par exemple 1% d'hydrolysat de caséine, et une concentration de sucre plus élevée, par exemple 5% de saccharose, a permis d'obtenir 5-6 g/L d'AH à poids moléculaire élevé compris entre 3,5 et 4,0 x 106 Da. La présente invention concerne également un procédé efficace de purification d'AH, comprenant un traitement au moyen de gel de silice puis de charbon actif, suivi d'une diafiltration avec un volume de solvant moindre.

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