Process and apparatus for removal of DNA and viruses
First Claim
1. A process for the removal of DNA, endotoxins and viruses from aqueous buffer solutions, aqueous pharmaceutical solutions and aqueous biological pharmaceutical solutions comprising, passing one of said aqueous buffer solutions, aqueous pharmaceutical solutions and aqueous biological pharmaceutical solutions through a first DNA filter section and a second virus filter section, wherein said DNA, viruses and endotoxins are substantially removed;
- and collecting said aqueous buffer solutions, aqueous pharmaceutical solutions or aqueous biological pharmaceutical solutions;
said first DNA filter having;
(i) a first absolute pore filter,(ii) a first and second filter selected from one of (a) a DEAE cellulose filter membrane and (b) an absolute pore filter coated with at least one of DEAE cellulose, quaternary aminoethyl salts and quaternary aminomethyl salts, and(iii) a second absolute pore filter; and
said second virus filter section having absolute pore filters of smaller pore diameter than the absolute pore filters in the DNA filter section.
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Accused Products
Abstract
A single filtration device containing coated filter membranes and absolute pore filters is provided in which the membranes and absolute pore filters are present in two sections of the filter device. The filter device will remove viruses, as modeled by type-C Xenotropic retrovirus, with an efficiency of at least 4.6×105 ; remove DNA from levels of 10 μg/sample to levels below 10 picograms per 500 mg sample of monoclonal antibody; and will remove at least 97% of some bacterial endotoxins.
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Citations
26 Claims
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1. A process for the removal of DNA, endotoxins and viruses from aqueous buffer solutions, aqueous pharmaceutical solutions and aqueous biological pharmaceutical solutions comprising, passing one of said aqueous buffer solutions, aqueous pharmaceutical solutions and aqueous biological pharmaceutical solutions through a first DNA filter section and a second virus filter section, wherein said DNA, viruses and endotoxins are substantially removed;
- and collecting said aqueous buffer solutions, aqueous pharmaceutical solutions or aqueous biological pharmaceutical solutions;
said first DNA filter having;(i) a first absolute pore filter, (ii) a first and second filter selected from one of (a) a DEAE cellulose filter membrane and (b) an absolute pore filter coated with at least one of DEAE cellulose, quaternary aminoethyl salts and quaternary aminomethyl salts, and (iii) a second absolute pore filter; and
said second virus filter section having absolute pore filters of smaller pore diameter than the absolute pore filters in the DNA filter section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15)
- and collecting said aqueous buffer solutions, aqueous pharmaceutical solutions or aqueous biological pharmaceutical solutions;
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8. A process for the removal of DNA and viruses from aqueous pharmaceutical solutions and aqueous biological pharmaceutical solutions, comprising passing either one of the solutions through a first DNA filter section and a second virus filter section to obtain a filtered aqueous pharmaceutical solution or a filtered aqueous biological pharmaceutical solution having substantially reduced DNA and virus levels, said solutions passing through:
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(a) a first DNA filter section comprising a first 0.2 micron absolute pore filter, a first diethylaminoethyl cellulose filter, a second diethylaminoethyl cellulose filter and a second 0.2 micron absolute pore filter, and (b) a second virus filter section comprising a first 0.1 micron absolute pore filter, a second 0.1 micron absolute pore filter, a first 0.04 micron absolute pore filter and a second 0.04 micron absolute pore filter; and
collecting the filtered solutions. - View Dependent Claims (9, 10, 11, 12, 13, 14, 24)
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16. An improved apparatus for the removal of DNA, endotoxins and viruses from aqueous buffer solutions, aqueous pharmaceutical solutions and aqueous biological pharmaceutical solutions, said apparatus having a housing with suitable inlet/outlet means internal gaskets and filter supports, and internal filters wherein the improvement comprises a first DNA filter section having, from inflow to outflow, a first 0.2 micron filter, a first diethylaminoethyl cellulose filter, a second diethylaminoethyl cellulose filter and a second 0.2 micron filter, the filters having face-to-face contact;
- and a second virus filter section having, from inflow to outflow, a first 0.1 micron filter, a second 0.1 micron filter, a first 0.04 micron filter and a second 0.04 micron filter, said filters having face-to-face contact.
- View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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25. An improved apparatus for the removal of DNA, endotoxins and viruses from aqueous buffer solutions, aqueous pharmaceutical solutions and aqueous biological pharmaceutical solutions, said apparatus having a housing with suitable inlet/outlet means, internal gaskets and filter supports, and internal filters wherein the improvement comprises a first DNA filter section having, from inflow to outflow, a first 0.2 micron filter, a second 0.2 micron filter, the filters having face-to-face contact;
- and a second virus filter section having, from inflow to outflow, a first 0.1 micron filter, a second 0.1 micron filter, a first 0.04 micron filter and a second 0.04 micron filter, said filters having face-to-face contact;
wherein at least one of the absolute pore filters is coated with at least one of the group consisting of DEAE, QAE, QAM and other quaternary ammonium salts.
- and a second virus filter section having, from inflow to outflow, a first 0.1 micron filter, a second 0.1 micron filter, a first 0.04 micron filter and a second 0.04 micron filter, said filters having face-to-face contact;
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26. An improved apparatus for the removal of DNA, endotoxins and viruses from aqueous buffer solutions, aqueous pharmaceutical solutions and aqueous biological pharmaceutical solutions, said apparatus having a housing with suitable inlet/outlet means, internal gaskets and filter supports, and internal filters wherein the improvement comprises a first DNA filter section having, from inflow to outflow, a first 0.2 micron filter, first and second absolute pore filters coated with at least one selected from the group consisting of DEAE cellulose, QAE, QAM and other quaternary ammonium salts, a second 0.2 micron filter, the filters having face-to-face contact;
- and a second virus filter section having, from inflow to outflow, a first 0.1 micron filter, a second 0.1 micron filter, a first 0.04 micron filter and a second 0.04 micron filter, said filters having face-to-face contact.
Specification