Is there any protocol to label DNA with silver nanoparticle and how to characterize the nanoparticle-DNA complex?

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Anton Beletskii

Gold reagents should be easily available, not sure about silver particles. The labeling scheme will be the same. Very likely there are other methods, but not with easily available reagents:

https://en.wikipedia.org/wiki/Immunogold_labelling

And gold particles can be coated with silver:

http://www.nanoprobes.com/products/Silver-Enhancers.html