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Last Updated: March 29, 2024

Claims for Patent: 7,759,098


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Summary for Patent: 7,759,098
Title:Process for immobilized nano-sized metal particles
Abstract: The present invention provides a new process using biological method for the preparation of immobilized nano-particles of metals. Fungi are used to efficiently prepare immobilized nano-particles of various metals ions such as Au, Ag, Pd, Pt, Ni, Rh and Ru from their aqueous solutions.
Inventor(s): Mukherjee; Priyabrata (Maharashtra, IN), Absar; Ahmad (Maharashtra, IN), Mandal; Deendayal (Maharashtra, IN), Senapati; Satyajyoti (Maharashtra, IN), Khan; Mohammed Islam (Maharashtra, IN), Sastry; Murali (Pune, IN), Kumar; Rajiv (Maharashtra, IN)
Assignee: Council of Scientific and Industrial Research (New Delhi, IN)
Application Number:12/129,451
Patent Claims:1. A process for preparing immobilized nano-sized metal particles comprising treating wet fungal mycelia of Verticillium (AAT-TS-4) with a metal ion solution at temperature in the range of 15 to 40.degree. C. for a period in the range of 2 to 120 hours, separating the biomass to obtain the immobilized nano-sized metal particles deposited on to the surface of the fungal cells.

2. A process as claimed in claim 1 wherein the wet fungal mycelia is obtained by growing the Verticillium (AAT-TS-4) in a culture medium for a period of 2 to 120 hours at temperature ranging between 15-40.degree. C. under aseptic conditions, separating the biomass by centrifugation, washing several times with sterile water, and then incubating the whole reaction mixture at 15 to 40.degree. C. and atmospheric pressure.

3. A process as claimed in claim 1 wherein the metal ion solution is obtained by dissolving metal salts of group IB-VIIIB metals in water.

4. A process as claimed in claim 3 wherein the metal is selected from the group consisting of Au, Ag, Pd, Pt, Ni, Rh and Ru.

5. A process as claimed in claim 3 wherein the metal salts are selected from the group consisting of halides, nitrates and carbonates.

6. A process as claimed in claim 1 wherein the metal ion solution is obtained by dissolving the acidic form of metals in water.

7. A process as claimed in claim 6 wherein the acidic form of the metal is selected from chloroauric acid and chloroplatinic acid.

8. A process as claimed in claim 1 wherein the concentration of metal ions per gram of wet fungal mycelia is in the range of 10 to 200 mg metal ions per gram of wet fungal mycelia.

9. A process as claimed in claim 8 wherein the concentration of metal ions per gram of wet fungal mycelia is in the range of 10 to 100 mg metal ions per gram of wet fungal mycelia.

10. A process as claimed in claim 8 wherein the concentration of metal ions per gram of wet fungal mycelia is in the range of 25 to 100 mg metal ions per gram of wet fungal mycelia.

11. A process as claimed in claim 1 wherein the ratio of water to wet fungal mycelia is 100:1 (w/w).

12. A process as claimed in claim 1 wherein the fungus Verticillium AAT-TS-4 is taken as whole cell as wet solid mass.

13. A process as claimed in claim 1 wherein the reaction of the fungus and metal ion source in solution is carried out in water.

14. A process as claimed in claim 1 wherein the incubation/reaction temperature is in the range of 15-40.degree. C.

15. A process as claimed in claim 14 wherein the incubation/reaction temperature is in the range of 23-33.degree. C.

16. A process as claimed in claim 14 wherein the incubation/reaction temperature is in the range of 25-29.degree. C.

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