Preservative solutions
View Patent ↗This invention relates to preservative solutions for peptides, for example, parathyroid hormone, insulin-like growth factor binding protein 3 (IGFBP3), adrenocorticotropic hormone (ACTH) and mixtures thereof. Preferably, the peptides preserved by the solutions are non-reconstituted. In one embodiment, the preservative solutions comprise a polyvinyl alcohol, EDTA component and molybdic component.
1. A solution of a diagnostic system, comprising a non-reconstituted peptide, a polyvinyl alcohol, an EDTA water soluble salt, and a water soluble salt of molybdenum, wherein the peptide remains stable in the solution for at least six months.
2. The solution of claim 1 wherein the EDTA water soluble salt is an EDTA disodium salt, and wherein the water soluble salt of molybdenum is sodium molybdate.
3. The solution of claim 1 wherein the preservative comprises about 0.10% to about 1% (% v/v) polyvinyl alcohol, about 0.10% to about 0.50% (% w/v) of a dissolved EDTA di-sodium salt and about 0.10% to about 1.00% (% w/v) of a dissolved molybdate salt.
4. The solution of claim 1 wherein the preservative comprises about 0.5% (% v/v) polyvinyl alcohol, about 0.17% (% w/v) dissolved EDTA di-sodium salt, and about 0.7% (% w/v) dissolved molybdate salt.
5. The solution of claim 1 further comprising a non-binding reducer.
6. The solution of claim 1 further comprising approximately 0.5% t-octylphenoxypolyethoxyethanol (TX-100).
7. The solution of claim 1 further comprising at least one of bovine serum albumin and fish skin gelatin.
8. The solution of claim 1 further comprising about 2.0% of at least one of bovine serum albumin and fish skin gelatin.
9. The solution of claim 1 having a pH of about 5 to about 8.
10. The solution of claim 1 having a pH of about 6.
11. The solution of claim 1 wherein the peptide is selected from the group consisting of parathyroid hormone, insulin-like growth factor binding protein 3 (IGFBP3), and adrenocorticotropic hormone (ACTH).
12. A diagnostic test system comprising:
a. a plurality of standards of known percentages of a non-reconstituted peptide in a solution comprising a preservative, wherein the standards have a useful shelf life of at least six months, the preservative comprises a polyvinyl alcohol, an EDTA water soluble salt, and a water soluble salt of molybdenum;
b. a solid phase coated with anti-peptide antibody; and
c. a composition of labeled antibody of the peptide.
13. The system of claim 12 wherein the EDTA water soluble salt comprises a dissolved EDTA di-sodium salt and the water soluble salt of molybdenum comprises a dissolved sodium molybdate.
14. The system of claim 12 wherein the preservative comprises about 0.10% to about 1% (% v/v) polyvinyl alcohol, about 0.10% to about 0.50% (% w/v) dissolved EDTA di-sodium salt and about 0.10% to about 1.00% (% w/v) dissolved molybdate.
15. The system of claim 12 , wherein the solution further comprises a non-binding reducer.
16. The system of claim 12 , wherein the solution further comprises approximately 0.5% t-octylphenoxypolyethoxyethanol (TX-100).
17. The system of claim 12 , wherein the solution further comprises a protein selected from the group consisting of bovine serum albumin, and fish skin gelatin.
18. The system of claim 12 , wherein the solution has a pH of about 5 to about 8.
19. The system of claim 12 , wherein the solution has a pH of about 6.
20. The system of claim 12 wherein the peptide is selected from the group consisting of parathyroid hormone, insulin-like growth factor binding protein 3 (IGFBP3), and adrenocorticotropic hormone (ACTH).