Microwave sterilization of dry protein

• US 4,250,139 A
• Filed: 02/01/1979
• Issued: 02/10/1981
• Est. Priority Date: 02/01/1979
• Status: Expired due to Term

• Current Assignee: Cohesion Technologies Inc. (Angiotech Pharmaceuticals Incorporated)
• Original Assignee: Collagen Corp. (Abbvie Incorporated)
• Inventors: Luck, Edward E., Daniels, John R.
• Primary Examiner(s): Richman, Barry S.
• Application Number:
  US06/008,652
• Time in Patent Office: 740 Days
• Field of Search: 422/21, 426/241, 426/242, 426/234, 435/173
• US Class Current: 422/21
• CPC Class Codes: A61K 35/16 Blood plasma; Blood serum umbilical cord blood A61K35/51
• CPC Class Codes: A61L 2/0011 using physical methods
• CPC Class Codes: A61L 2/12 Microwaves

Abstract

Method for decontaminating proteinaceous host materials from microorganisms, while retaining chemical, physical and physiological properties of said host proteinaceous materials, said method comprising substantially dehydrating said host proteinaceous material, preferably by lyophilization, and subjecting said host material to a lethal dosage of microwave energy while said host material is maintained in substantially ambient conditions.

Claims

1. A method for disinfecting a host protein having physiological properties for use in a mammalian host without significantly affecting the physiological, chemical and physical properties of said host protein, said method comprising applying to said host protein substantially freed of water a lethal dosage of microave energy at a temperature above ambient temperature and below about 75°

C. and for a time sufficient to decontaminate said host protein.

2. A method according to claim 1, wherein said host protein is dried by lyophilization.

3. A method according to claim 2, wherein said time is in the range of about 1 min to 6 hrs.

4. A method according to claim 3, wherein said microwave energy is in the range of about 850 to 3,000 megacycles per second.

5. A method according to any of claims 1 to 4, wherein said host protein is collagen.

6. A method according to any of claims 1 to 4, wherein said host protein is at least one serum protein.

7. A method for sterilizing a host proteinaceous material for use in a mammlian host obtained as an aqueous dispersion without significantly affecting the physiological, chemical and physical properties of said host protein, said method comprising:

lyophilizing said aqueous dispersion at a temperature below about 50°

C. to provide a lyophilized protein product; and

irradiating said lyophilized protein product with a lethal dosage of microwave radiation for a time sufficient to sterilize said protein, while maintaining the temperature of said host protein above about ambient and below about 60°

C.

8. A method according to claim 7, wherein said protein is collagen.

9. A method according to claim 7, wherein said protein is at least one serum protein.