A method for selective removal of a substance from samples...

B - Operations – Transporting – 01 – J

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B01J 20/32 (2006.01) B01D 15/08 (2006.01) B01D 15/36 (2006.01) B01J 41/20 (2006.01) C12N 15/10 (2006.01)

Patent

CA 2392374

A method for purifying a desired substance comprising nucleic acid structure by separating substance (I) from substance (II), one of which is the desired substance, both of which have affinity for the same ligand structure, and substance (I) is smaller than substance (II). The method comprises: (i) providing substances I and II in a liquid; (ii) contacting the liquid with an adsorbent which selectively adsorbs substance I; (iii) recovering the desired substance; The adsorbent has (a) an interior part which carries a ligand structure that is capable of binding to substances I and II, and is accessible to substance I, and (b) an outer surface layer that does not adsorb substance II, and is more easily penetrated by substance I than by substance II. The use of certain anion exchangers funtionalized with a plurality of chargeable amine groups for the removal and/or purification of nucleic acid vectors. The matrices used should have (A) an increased elution ionic strength for at least one of a selection of standard proteins compared to a reference anion exchanger, or (B) have a hydroxy or amino nitrogen at a distance of 2-3 carbons from the amine groups.

L'invention concerne un procédé permettant de purifier une substance désirée, qui comprend une structure d'acide nucléique, par séparation d'une substance (I) d'une autre substance (II), l'une d'elle étant la substance désirée, toutes deux ayant une affinité pour la même structure de ligand, et la substance (I) étant plus petite que la substance (II). Le procédé consiste i) à fournir les substances I et II dans un liquide; ii) à mettre ledit liquide en contact avec un adsorbant qui adsorbe sélectivement la substance I; et iii) à récupérer la substance désirée. L'adsorbant possède a) une partie intérieure qui porte une structure de ligand capable de se lier aux substances I et II, et qui est accessible à ladite substance I; et b) une couche de surface extérieure qui n'adsorbe pas la substance II, et qui est plus facilement pénétrée par la substance I que par la substance II. L'invention concerne également l'utilisation de certains échangeurs d'anions fonctionnalisés par plusieurs groupes d'amine chargeables permettant l'élimination et/ou la purification de vecteurs d'acide nucléique. Les matrices utilisées doivent posséder A) une force ionique d'élution accrue pour au moins une sélection de protéines standard comparées à un échangeur d'anions de référence, ou B) un hydroxy ou un amino azote situé à une distance de 2-3 atomes de carbone des groupes aminés.

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