Many novel immunoassays methods employed functional (antibodies-conjugated) nanoparticles as novel probe to detect analytes. My question is how to determine the number of antibodies conjugated on the nanoparticles? Can anyone answer this question?
In my opinion is not important to know the number of antibodies that coat the nanoparticle surface, but the efficiency with which recognize the antigen, since some of them may be misguided in their own bonding and hidden areas of antigen binding.
You need to know the molecular weight of your antibody. Also from ICP-OES you can determine the concentration of AuNPs, subsequently you can calculate the number of AuNPs particles in given solution.
Although, to me it is not necessary to calculate the number of antibody binds to AuNPs. Instead of you can calculate the amount of antibody is conjugated with AuNPs.