Cross-linked collagen with at least one bound antimicrobial agent for in vivo release of the agent
The disclosure describes collagen constructs comprising antimicrobial agents and related methods.
1. An antimicrobial cross-linked collagen construct comprising: a cross-linked collagen comprising collagen and one or more cross-linking agents and an antimicrobial amount of silver incorporated into the construct, wherein at least a portion of the silver is incorporated into the cross-linked collagen by chelation, and at least one of the cross-linking agents is nordihydroguaiaretic acid (NDGA).
2. The construct of claim 1 , wherein the silver comprises ionic silver selected from the group consisting of silver (I) and/or silver (II).
3. The construct of claim 2 wherein the ionic silver comprises silver chloride, silver phosphate, silver sulfate, silver acetate, silver nitrate, silver fluoride, silver iodide, silver lactate, silver benzoate, silver bromide, silver carbonate, silver citrate, silver iodate, silver laurate, silver oxide, silver palmitate, silver protein, silver imidazolate, arglaes, colloidal silver, silver crystals.
4. The construct of claim 1 , wherein the silver incorporated into the construct is present in an amount of between about 0.1% to about 30%.
5. The construct of claim 1 , wherein some or all of the antimicrobial amount of silver is released in vivo in contact with an aqueous medium.
6. The construct of claim 1 , wherein the antimicrobial cross-linked collagen construct provides a sustained release of silver, wherein the sustained release comprises a plurality of release rates including an immediate release, an intermediate release, an extended release or any combination of release rates thereof.
7. The construct of claim 6 , wherein an effective amount of silver is released from about 1 minute to about 60 days, or any range therein.
8. A method of manufacturing an antimicrobial cross-linked collagen construct comprising cross-linked collagen and an antimicrobial amount of silver, wherein the silver is incorporated into the construct at least in part through the cross-linking agent, the method comprising contacting the cross-linked collagen with silver to provide the antimicrobial cross-linked collagen construct, wherein the cross-linked collagen comprises collagen and one or more cross-linking agents, and at least one of the cross-linking agents is NDGA.
9. A method of treating a subject suffering from a microbial infection, the method comprising administering an antimicrobial cross-linked collagen construct in the subject, wherein the construct comprises (a) cross-linked collagen comprising collagen and one or more cross-linking agents and (b) silver incorporated therein, to release an effective amount of silver into the subject, and wherein at least one of the cross-linking agents is NDGA.
10. The method of claim 9 wherein the effective amount of silver is released from the construct as ionic silver and/or as non-ionic silver in a plurality of in vivo release rates.