Gelatin-transglutaminase hemostatic dressings and sealants
An adhesive material for medical use comprising gelatin and a non-toxic cross-linking material such as transglutaminase. An optional embodiment of the invention includes dressings in which a layer of a transglutaminase is sandwiched between a first and second layer of gelatin. The hemostatic products are useful for the treatment of wounded tissue.
1. A composition for inducing hemostasis and/or sealing a wound, comprising a mixture of animal gelatin and transglutaminase, wherein said mixture is modified with a denaturant selected from the group consisting of Guanidine Hydrochloride and Urea such that said gelatin forms a solution with transglutaminase at a temperature lower than the natural sol-gel transition temperature of standard animal gelatin and such that said gelatin has been modified to have a reduced sol-gel transition temperature with said denaturant.
2. The composition of claim 1 , further comprising an additive to increase solubility of said gelatin in said mixture.
3. The composition of claim 2 , further comprising an additive to reduce said sol-gel transition temperature of said gelatin.
4. The composition of claim 3 , further comprising a plasticizer.
5. The composition of claim 4 , wherein said plasticizer is selected from the group consisting of a polyhydric alcohol, glycerine, glycerol, xylitol, sucrose, sorbitol, triethanolamine, resorcin, thiodiglycol, sodium salt of toluenesulphoacid, butylene glycol, urea nitrate, thiourea, urea, glutamic acid, aspargic acid, valine, glycine, KSCN, KI, and LiBr.
6. The composition of claim 1 , further comprising an adjusting agent selected from the group consisting of a pH adjusting agent and an ion concentration adjusting agent.
7. The composition of claim 6 , wherein said pH adjusting agent provides a pH in a range of from about 1.5 to about 5.0 or from about 7.0 to about 9.0.
8. The composition of claim 6 , further comprising a salt.
9. The composition of claim 8 , further comprising a trehalose carbohydrate, mannitol carbohydrate, or other carbohydrate for stabilization for spray drying, lyophilization, or other protein drying.
10. The composition of claim 1 , wherein a concentration ratio range is from about 1:2 to about 2:2 GuHCl:gelatin, weight per weight or wherein a concentration ratio range is from about 0.5:1 to about 1:1 urea: gelatin, weight per weight.
11. The composition of claim 1 , further comprising a reducing agent.
12. The composition of claim 11 , wherein said reducing agent is selected from the group consisting of magnesium chloride and hydroquinone.
13. The composition of claim 12 , further comprising an exothermic agent.
14. The composition of claim 13 , wherein said exothermic agent comprises one or more of calcium chloride, other calcium salts, magnesium chloride, metallic oxides/zeolites, or a combination thereof.
15. The composition of claim 1 , wherein said transglutaminase composition has a specific activity level of at least about 40 U/gm.
16. The composition of claim 15 , wherein said transglutaminase composition has a specific activity level of at least about 800 U/gm.
17. The composition of claim 1 , wherein activity of said transglutaminase in the gelatin-transglutaminase composition is from about 25 to about 400 U/g of gelatin.
18. The composition of claim 17 , wherein said activity is from about 40 to about 200 U/g of gelatin.
19. The composition of claim 1 , wherein said transglutaminase comprises a plant, recombinant, animal, or microbe derived transglutaminase other than blood derived Factor XIII.
20. The composition of claim 1 , wherein said animal origin is selected from the group consisting of fish and mammals.
21. The composition of claim 1 , wherein said mammal is selected from the group consisting of pigs and cows.
22. A medical device for insertion into a body of a human or lower mammal, comprising a composition as claimed above in claim 1 .
23. The medical device of claim 22 , comprising a vascular catheter coated with said composition.
24. A composition for inducing hemostasis and/or sealing a wound, comprising a mixture of animal gelatin and transglutaminase, wherein said mixture is modified with a pH adjusting agent providing a pH in a range of from about 1.5 to about 5.0 such that said gelatin forms a solution with transglutaminase at a temperature lower than the natural sol-gel transition temperature of standard animal gelatin and such that said gelatin has been modified to have a reduced sol-gel transition temperature with said pH adjusting agent.
25. A composition for inducing hemostasis and/or sealing a wound, comprising a mixture of animal gelatin and transglutaminase, wherein said mixture is modified with a pH adjusting agent providing a pH in a range of from about 7.0 to about 9.0 such that said gelatin forms a solution with transglutaminase at a temperature lower than the natural sol-gel transition temperature of standard animal gelatin and such that said gelatin has been modified to have a reduced sol-gel transition temperature with said pH adjusting agent.
26. A composition for inducing hemostasis and/or sealing a wound, comprising a mixture of animal gelatin and transglutaminase, wherein said mixture is modified with a salt such that said gelatin forms a solution with transglutaminase at a temperature lower than the natural sol-gel transition temperature of standard animal gelatin and such that said gelatin has been modified to have a reduced sol-gel transition temperature with said salt.
27. A composition for inducing hemostasis and/or sealing a wound, comprising a mixture of animal gelatin and transglutaminase, wherein said mixture is modified with a reducing agent selected from the group consisting of magnesium chloride and hydroquinone such that said gelatin forms a solution with transglutaminase at a temperature lower than the natural sol-gel transition temperature of standard animal gelatin and such that said gelatin has been modified to have a reduced sol-gel transition temperature with said reducing agent.
28. A composition for inducing hemostasis and/or sealing a wound, comprising a mixture of animal gelatin and transglutaminase, wherein said mixture is modified with an exothermic agent comprising one or more of calcium chloride, other calcium salts, magnesium chloride, metallic oxides/zeolites, or a combination thereof, such that said gelatin forms a solution with transglutaminase at a temperature lower than the natural sol-gel transition temperature of standard animal gelatin and such that said gelatin has been modified to have a reduced sol-gel transition temperature with said exothermic agent.