In sandwich ELISA, a capture antibody attach to the 96-well plate prior to the antigen. Can the similar form be used in western blotting? In this way, a capture antibody attach to the nitrocellulose membrane prior to the antigen.
While theoretically possible, there is no benefit in binding a capture antibody to the nitrocellulose sheet, since the antigen is going to bind to nitrocellulose anyway.
For elisa/western blot, antigen and antibody interaction is mandatory for detection. If you want to develop blot on nitrocellulose membrane. You can use DAB subtrate against HRP tagged secondary antibody.