Process and apparatus for removal of DNA, viruses and endotoxins
First Claim
1. A process for the removal of DNA, viruses and about 98% of endotoxins from aqueous buffer solutions, aqueous pharmaceutical solution 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/endotoxin filter section and a second virus/endotoxin 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;
(I) said first DNA/endotoxin filter section having;
(A) (i) a first absolute pore filter,(ii) a first and second filter selected from one of the group consisting (a) a DEAE cellulose filter membrane, and (b) an absolute pore filter coated with at least one of the group consisting of diethylaminoethyl salts, quaternary aminoethyl salts and quaternary aminomethyl salts, and(iii) a second absolute pore filter;
or(B) plurality of absolute pore filters at least one of which is coated with at least one selected from the group consisting of dimethylaminoethyl salts, quaternary aminoethyl salts, and quaternary aminomethyl salts; and
(ii) said second virus/endotoxin filter section having absolute pore filters of a smaller diameter than the absolute pore filters or coated absolute pore filters in the DNA/endotoxin 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 up to about 98% of the endotoxins in addition to removing viruses with an efficiency of at least 4.6×105 and DNA to less than 10 picograms per 500 mg sample.
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Citations
24 Claims
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1. A process for the removal of DNA, viruses and about 98% of endotoxins from aqueous buffer solutions, aqueous pharmaceutical solution 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/endotoxin filter section and a second virus/endotoxin 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;
(I) said first DNA/endotoxin filter section having; (A) (i) a first absolute pore filter, (ii) a first and second filter selected from one of the group consisting (a) a DEAE cellulose filter membrane, and (b) an absolute pore filter coated with at least one of the group consisting of diethylaminoethyl salts, quaternary aminoethyl salts and quaternary aminomethyl salts, and (iii) a second absolute pore filter;
or(B) plurality of absolute pore filters at least one of which is coated with at least one selected from the group consisting of dimethylaminoethyl salts, quaternary aminoethyl salts, and quaternary aminomethyl salts; and (ii) said second virus/endotoxin filter section having absolute pore filters of a smaller diameter than the absolute pore filters or coated absolute pore filters in the DNA/endotoxin 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, viruses and about 98% of endotoxins from aqueous pharmaceutical solutions "and aqueous biological pharmaceutical solutions", said process comprising passing either one of the solutions through a first DNA/endotoxin filter section and a second virus/endotoxin filter section to obtain a filtered aqueous pharmaceutical solution or a filtered aqueous biological pharmaceutical solution having substantially reduced DNA, virus and endotoxin levels, said solutions passing through:
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(a) a first 0.2 micro absolute pore filter, a first diethylaminoethyl cellulose filter, a second diethylaminoethyl cellulose filter and a second 0.2 micron absolute pore filter in the first DNA/endotoxin filter section, and (b) 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 in the virus/endotoxin filter section; and
collecting the filtered solutions. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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16. An improved device for the removal of DNA, viruses and about 98% of endotoxins from aqueous buffer solutions, aqueous pharmaceutical solution and aqueous biological pharmaceutical solutions, said device having a housing with suitable inlet/outlet means, internal gaskets and filter supports, and internal filters, wherein the improvement comprises:
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(a) a first DNA/endotoxin filter section having, from inflow to outflow, a first 0.2 micron filter and a second 0.2 micron filter, the filters having face-to-face contact; (b) a second virus/endotoxin 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; and (c) DEAE functional groups, QAE functional groups, QAM functional groups or other quaternary amine functional groups bonded directly to one or more of the 0.2, 0.1 and 0.04 micron absolute pore filters. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification