Stabilization of proteins in solution
First Claim
1. A method of stabilizing an aqueous enzyme comprising the step of contacting the enzyme selected from the group consisting of peroxidase enzymes, alkaline phosphatase enzymes and antibody conjugates thereof with an aqueous solution of a protein stabilizer additive comprising:
- a. a tris(hydroxymethyl)methyl compound of formula 1;
space="preserve" listing-type="equation">(HOCH.sub.2).sub.3 C--R (1)wherein R is;
NH2 ;
NR1 R2 wherein R1 and R2 may be independently;
H, C1 -C4 alkyl, C1 -C4 hydroxyalkyl, C1 -C4 alkyl sulfonate, C1 -C4 hydroxyalkyl sulphonate;
C1 -C4 alkyl NHC(CH2 OH)3 ;
C1 -C4 alkyl carboxylate;
b. a cationic polyelectrolyte selected from the group consisting of copolymers of vinyl pyrollidone and quaternary methyl methacrylate and DEAE dextran;
c. a polyol selected from the group consisting of glycerol, ethylene glycol, sorbitol and lactitol; and
d. one or more salts selected from the group consisting of salt of calcium, magnesium and cobalt.
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Accused Products
Abstract
A protein stabilizer additive comprises two or more of a tris compound of the formula (1): (HOCH2)3 --C--R, wherein R is: C1 -C4 alkyl, substituted C1 -C4 alkyl, NH2 ; NR1 R2 wherein R1 and R2 may be independently: H, C1 -C4 alkyl sulphonate, C1 -C4 hydroxyalkyl sulphonate; C1 -C4 alkyl NHC(CH2 OH)3, C1 -C4 alkyl, C1 -C4 hydroxyalkyl; C1 -C4 alkyl carboxylate; a polyelectrolyte; a buffer; and one or more additional components for example divalent metal salts.
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Citations
9 Claims
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1. A method of stabilizing an aqueous enzyme comprising the step of contacting the enzyme selected from the group consisting of peroxidase enzymes, alkaline phosphatase enzymes and antibody conjugates thereof with an aqueous solution of a protein stabilizer additive comprising:
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a. a tris(hydroxymethyl)methyl compound of formula 1;
space="preserve" listing-type="equation">(HOCH.sub.2).sub.3 C--R (1)wherein R is;
NH2 ;
NR1 R2 wherein R1 and R2 may be independently;
H, C1 -C4 alkyl, C1 -C4 hydroxyalkyl, C1 -C4 alkyl sulfonate, C1 -C4 hydroxyalkyl sulphonate;
C1 -C4 alkyl NHC(CH2 OH)3 ;
C1 -C4 alkyl carboxylate;b. a cationic polyelectrolyte selected from the group consisting of copolymers of vinyl pyrollidone and quaternary methyl methacrylate and DEAE dextran; c. a polyol selected from the group consisting of glycerol, ethylene glycol, sorbitol and lactitol; and d. one or more salts selected from the group consisting of salt of calcium, magnesium and cobalt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification