Method for the production of hyperbranched polysaccharide...

C - Chemistry – Metallurgy – 12 – P

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C12P 19/22 (2006.01) A61K 31/718 (2006.01) A61K 47/48 (2006.01) C08B 30/20 (2006.01) C08B 35/00 (2006.01) C12P 19/14 (2006.01)

Patent

CA 2556114

The invention relates to a method for producing hyperbranched amylopectin having a mean molecular weight ranging between 2,000 and 29,000 Dalton and an average degree of branching of more than 10 percent and less than 20 percent, said degree of branching being expressed in mole percent of the anhydroglucose units carrying branching points. According to the inventive method, the molecular weight of plant amylopectins or starch rich in amylopectin is reduced to molecular weights not exceeding 60,000 Dalton by means of a-amylase or acid hydrolysis in a first hydrolysis step, and the molecular weight of the reduced product obtained in the first hydrolysis step is further reduced by means of .szlig.-amylase reduction in a second hydrolysis step. The invention further relates to the production of coupling products of the hyperbranched amylopectin with a pharmaceutical agent.

L'invention concerne un procédé permettant de produire des amylopectines hyper-ramifiées, d'un poids moléculaire moyen en poids inférieur ou égal à 29.000 Dalton et supérieur ou égal à 2.000 Dalton et d'un degré de ramification, exprimé en % en mole des unités anhydroglucose qui portent des points de ramification, supérieur à 10 % et inférieur ou égal à 20 %. Selon ce procédé, dans une première étape d'hydrolyse, le poids moléculaire des amylopectines végétales ou de l'amidon à haute teneur en amylopectine est réduit par .alpha.-amylase ou acidolyse, à des poids moléculaires inférieurs ou égaux à 60.000 Dalton. Dans une seconde étape d'hydrolyse, le poids moléculaire du produit de dégradation issu de la première étape d'hydrolyse est réduit davantage encore, par décomposition par .beta.-amylase. L'invention concerne en outre la production de produits de couplage de l'amylopectine hyper-ramifiée avec un principe actif pharmaceutique.

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