Separation Of Virus And/Or Protein From Nucleic Acids By Primary Amines
A method of purifying biomolecules with an anion exchanger containing a membrane having a surface having a polymer such as a primary or secondary amine ligand formed thereon, such as polyallylamine. The feedstock is introduced to the exchanger in the presence of one or more ionic-modifiers by themselves or in combination with monovalent salt. The ionic modifier alters the binding ability of the primary amines such that they retain a significant binding capacity for highly charged species such as DNA but lose part or almost all of their binding capacity for less charged species such as viruses or proteins at pH above the pI of the virus or protein.
1 . A method of purifying a sample comprising at least one biomolecule and DNA, said method comprising: purifying said sample by introducing said sample, in the presence of one or more ionic-modifiers optionally in combination with one or more monovalent salts, in an anion exchanger comprising a porous substrate with one or more polymeric primary amines or copolymers thereof formed thereon; and collecting the further purified sample containing said biomolecule free of DNA.
2 . The method of claim 1 , wherein said one or more ionic-modifiers comprises a buffer.
3 . The method of claim 1 , wherein said one or more ionic-modifiers comprises phosphate ions.
4 . The method of claim 1 , wherein said one or more ionic-modifiers comprises citrate ions.
5 . The method of claim 1 , wherein said one or more ionic-modifier comprises ethylenediaminetetraacetic acid ions.
6 . The method of claim 1 , wherein said one or more monovalent salts comprises sodium chloride.
7 . The method of claim 1 , wherein said substrate comprises a microporous membrane.
8 . The method of claim 7 , wherein said membrane comprises a polyolefin.
9 . The method of claim 8 , wherein said polyolefin is polyethylene.
10 . The method of claim 1 , wherein said substrate is an ultrahigh molecular weight polyethylene membrane.
11 . The method of claim 1 , wherein said polymer comprises polyallylamine or a protonated polyallylamine.
12 . The method of claim 1 , wherein said polymer comprises a copolymer or block copolymer containing polyallylamine or a protonated polyallylamine.
13 . The method of claim 1 , wherein said polymer is crosslinked.