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Protein Protocols Protein Protocols

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Immunogold 395<br />

Fig. 2. Schematic representation of the silver-enhancement process. In the initial phase (A),<br />

the gold probe attaches to the primary antibody, which is bound to immobilized antigen. During<br />

the silver-enhancement process, layers of silver selectively precipitate on the colloidal gold<br />

surface (B). The result is a significantly larger particle and a silver surface that generates a<br />

more intense macroscopic signal (C).<br />

Fig. 3. Silver-enhancement time dependency for both the classical and IntenSE BL silver<br />

enhancers.<br />

obtained is comparable to that of silver staining for polyacrylamide gels. Segers and<br />

Rabaey (13) found it detected more spots on transfers of two-dimensional (2-D) gels<br />

than silver straining of the gels. For applications demanding very high sensitivity, it is<br />

also possible to amplify the signal further by performing a silver-enhancement step<br />

using ItenSE BL. An additional feature of total protein staining with gold is that, as<br />

with India ink (14), the immunoreactivity of the proteins is not altered.

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