Formation of colloidal metal dispersions using aminodextrans as reductants and protective agents
First Claim
1. A method for preparing colloidal metal(O) particles from a solution of a metal salt and coating said particles with a polymeric organic compound which also is used as a reductant for said metal salt, said method comprising:
- (a) heating a solution containing an amine derivatized, oxidizable sugar containing polysaccharide and a metal salt capable of being reduced by said oxidizable sugar containing polysaccharide for a time and at a temperature sufficient to reduce said metal salt to colloidal metal particles and simultaneously coating said particles with said polysaccharide; and
(b) stabilizing the amine derivatized polysaccharide coating on said particles by means of a bifunctional crosslinking agent, a diamine and a reducing agent.
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Accused Products
Abstract
The invention related generally to the preparation of colloidal metal(O) particles having a crosslinked aminodextran coating with pendent amine groups attached thereto. The aminodextran acts as both a reductant for reducing metal ions to metal(O) particles and as the protective agent which coats the metal(O) particles thus formed. After stabilizing the aminodextran coating by use of a crosslinking agent, the coated particles can be used to covalently bind proteins. The resulting protein containing colloidal particles can be used as markers in optical and electron microscopy, in immunological and biological assays, and possibly as therapeutic agents.
115 Citations
37 Claims
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1. A method for preparing colloidal metal(O) particles from a solution of a metal salt and coating said particles with a polymeric organic compound which also is used as a reductant for said metal salt, said method comprising:
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(a) heating a solution containing an amine derivatized, oxidizable sugar containing polysaccharide and a metal salt capable of being reduced by said oxidizable sugar containing polysaccharide for a time and at a temperature sufficient to reduce said metal salt to colloidal metal particles and simultaneously coating said particles with said polysaccharide; and (b) stabilizing the amine derivatized polysaccharide coating on said particles by means of a bifunctional crosslinking agent, a diamine and a reducing agent. - View Dependent Claims (2, 3, 4, 5, 13, 14, 15, 16, 17, 18, 19, 20)
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6. A method of preparing colloidal metal(O) particles coated with an amine derivatized, oxidizable sugar containing polysaccharide, said method comprising:
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(a) heating an aqueous solution of a sugar reducible metal salt and adding to said solution an aqueous solution of an amine derivatized polysaccharide having at least one reducing sugar component; (b) heating and mixing the solution resulting from step (a) for about 10-30 minutes at a temperature in the range of about 90°
-100°
C. to reduce said metal salt by said polysaccharide to colloidal metal(O) particles suspended in said polysaccharide solution and coated with said polysaccharide;(c) cooling the solution resulting from step (b) to room temperature and adding to the cooled solution an aqueous first bifunctional reagent capable of reacting with amine groups on said amine derivatized polysaccharide; (d) adding an organic diamine to the product of step (c); (e) reducing the reducible groups formed in step (d); (f) dialyzing the solution of step (e) against water; and (g) centrifuging the product of step (f) to obtain amine derivatized polysaccharide coated particles capable of being dispersed as colloids. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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- 21. Colloidal metal(O) particles having a polymeric organic coating thereon of a substance used to form said metal(O) particles by reduction of a metal salt with said substance, said coating comprising a stabilized amine derivatized polysaccharide and said coating being stabilized by means of a bifunctional crosslinking agent, a diamine and a reducing agent.
- 27. Coated colloidal metal particles having a protein bound thereto, said particles comprising colloidal metal(O) particles coated with a stabilized amine derivatized polysaccharide and a protein bound to said coating, said coating being stabilized by means of a bifunctional crosslinking agent, a diamine and a reducing agent, and said metal(O) particles being formed by reduction of a metal salt with said amine derivatized polysaccharide.
Specification