Method for controlling streptococcus pneumoniae serotype 19a...

C - Chemistry – Metallurgy – 12 – P

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C12P 19/04 (2006.01)

Patent

CA 2743710

The present invention provides improved methods for producing a solution containing high molecular weight isolated Streptococcus pneumoniae 19A capsular polysaccharides. In certain methods, a fermentation culture of Streptococcus pneumoniae bacterial cells that produce serotype 19A capsular polysaccharides is fermented for less than 6 hours before the bacterial cells are lysed the capsular polysaccharides are harvested. In other methods, CO2 is supplied to the fermentation culture. Supplying CO2 to the fermentation culture includes adding bicarbonate ions to the fermentation culture, adding carbonate ions to the fermentation culture, adding mixtures of bicarbonate and carbonate ions to the fermentation culture, and overlaying the fermentation culture with CO2.

La présente invention porte sur des procédés améliorés de production d'une solution contenant des polysaccharides capsulaires 19A de Streptococcus pneumoniae isolés à masse moléculaire élevée. Dans certains procédés, une culture de fermentation de cellules bactériennes de Streptococcus pneumoniae qui produisent des polysaccharides capsulaires de sérotype 19A est fermentée pendant moins de 6 heures avant que les cellules bactériennes soient lysées et que les polysaccharides capsulaires soient récoltés. Dans d'autres procédés, du CO2 est fourni à la culture de fermentation. L'apport de CO2 à la culture de fermentation comprend l'ajout d'ions bicarbonate à la culture de fermentation, l'ajout d'ions carbonate à la culture de fermentation, l'ajout de mélanges d'ions bicarbonate et carbonate à la culture de fermentation et le recouvrement de la culture de fermentation par du CO2.

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