Hyperbranched amylopectin for use in methods for surgical or...

C - Chemistry – Metallurgy – 08 – B

Patent

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Details

C08B 35/00 (2006.01) A01N 1/02 (2006.01) A61K 9/00 (2006.01) A61K 31/718 (2006.01) A61K 47/36 (2006.01) A61M 1/36 (2006.01) C08B 30/20 (2006.01) G01N 33/49 (2006.01)

Patent

CA 2456507

The invention relates to the use of hyperbranched amylopectin which has an average branch degree of between > 10 and 25 mol % and a molecular weight (Mw) ranging from 40.000 - 800.000 Dalton and the derivatives thereof in methods for surgical or therapeutic treatment of human or animal bodies or in a diagnostic method, preferably as a plasma volume expander. Plasma volume expanders based on hydroxy-ethylated amylopectin have, as a result of hydroxy ethylation, hitherto exhibited the disadvantage of incomplete metabolism and thus temporary tissue storage which is linked to side-effects. According to the invention, novel plasma expanders based on polysaccharides which do not exhibit the same disadvantages as the former are provided. Improved, completely metabolised plasma expanders based on hyperbranched amylopectin which can be obtained therefrom so that native plant-amylopectins are altered by transglycosylation in such a way the adjustable, high degree of branching enables control of the serum-.alpha.-amylase decomposition so that no or only a very insignificant degree of hydroxy ethylation is necessary.

Utilisation d'amylopectine hyperramifiée qui possède un degré de ramification moyen situé entre > 10 et 25 % en moles et une masse moléculaire Mw de l'ordre de 40 000 à 800 000 daltons, et des dérivés de cette amylopectine dans des procédés de traitement chirurgical ou thérapeutique du corps humain ou animal ou dans des procédés de diagnostic, de préférence en tant que succédané de plasma. Les succédanés de plasma à base d'amylopectine hydroxyéthylée possèdent encore, en raison de l'hydroxyéthylation, l'inconvénient d'une métabolisation incomplète et donc d'une accumulation temporaire dans les tissus liée à des effets secondaires. La présente invention concerne de nouveaux succédanés de plasma à base de polysaccharides qui ne présentent pas cet inconvénient. Elle permet d'obtenir des succédanés de plasma améliorés et complètement métabolisés à base d'amylopectine hyperramifiée, par exemple par modification d'amylopectine végétale native par transglycosylation de manière telle que le degré de ramification élevé et ajustable permet une régulation de la décomposition de la .alpha.-amylase sérique si bien qu'il n'est nécessaire d'effectuer aucune hydroxyéthylation ou qu'une hydroxyéthylation très faible.

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