Process for the preparation of bio-organic coated gold and silver nanoparticles using blue light

A process for the preparation of bio-organic coated gold nanoparticle or bio-organic coated silver nanoparticles using blue light, comprising the steps of:

• (a) preparing a solution of AgNO3 or HAuCl4 in the range of 60-300 μM, optionally in a buffer having pH of 5 to 8 or in water having 0.1 to 300 mM NaCl;
• (b) adding pure biomolecules to the solution prepared in step (a), wherein the molar ratio of AgNO3 to biomolecule is 50:1 or the molar ratio of HAuCl4 to biomolecule is 300:1, wherein the biomolecules are selected from the group consisting of peptides, antibodies, proteins, aptamers and oligonucleotides;
• (c) exposing the mixture of step (b) to blue light having a wattage in the range of 40 W to 200 W for 0.1 to 60 hours at a temperature of 30° C. to obtain the bio-organic coated gold nanoparticle or bio-organic coated silver nanoparticles.