Loading and unloading of permeating protectants for cell,...

A - Human Necessities – 01 – N

Patent

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A01N 1/00 (2006.01) A01N 1/02 (2006.01)

Patent

CA 2256714

The present invention is directed to a method for cryopreserving a biological sample, including gradually or stepwise loading the sample with permeating protectant by contacting the sample with solutions including the protectant and a non-permeating co-solute that limits the amount of protectant that penetrates into cells of the biological specimen. The method further includes the gradual or step of unloading (rehydration) of the sample by contacting the sample with one ore more rehydration solutions having progressively lower concentrations of both the protectant and co-solute, such that the protectant is removed from the cells of the sample. Concentration of the co-solute during loading and unloading should be at maximum value that still does not damage the sample at room and subzero temperatures.

L'invention concerne un procédé pour la cryopréservation d'un échantillon biologique, y compris la charge progressive ou par étape de l'échantillon avec un protecteur à perméation, procédé sans lequel on met en contact l'échantillon avec des solutions renfermant le protecteur et aussi un co-soluté sans perméation qui limite la quantité de protecteur pénétrant dans les cellules du spécimen biologique. Le procédé consiste en outre à décharger (sous forme de réhydratation) progressivement ou par étape l'échantillon par mise au contact d'une ou de plusieurs solutions réhydratantes en abaissant graduellement la concentration du protecteur et du co-soluté, de manière à éliminer le protecteur dans les cellules de l'échantillon. La concentration du co-soluté pendant les opérations de charge et de décharge doit avoir la valeur maximum atteignable sans pour autant endommager l'échantillon aussi bien à température ambiante qu'aux températures inférieures à 0·.

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