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Protein Protocols Protein Protocols

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Blotting–Electroblotting 319<br />

ued for too long. <strong>Protein</strong>s migrate faster from SDS gels (they are coated with SDS and<br />

highly charged), and transfer from non-SDS gels takes longer (around 4–5 h).<br />

7. Other proteins can be used for blocking (e.g., albumin, hemoglobin), but dried milk powder<br />

is usually the best option. Thirty-minute incubation with blocking protein is sufficient<br />

to saturate all the protein binding sites on the blot. Longer times and overnight incubation<br />

can be used if this is more convenient. <strong>Protein</strong> blocked sheets can be stored frozen for long<br />

periods. For this, drain excess blocking solution and place in a plastic bag when required,<br />

wash with blocking buffer for 10 min, then continue with the next processing steps.<br />

References<br />

1. Towbin, H., Staehelin, T., and Gordon, J. (1979) Electrophoretic transfer of proteins from<br />

polyacrylamide gels to nitrocellulose sheets: procedure and some applications. Proc. Natl.<br />

Acad. Sci. USA 76, 4350–4354.<br />

2. Johnstone, A. and Thorpe, R. (1996) Immunochemistry in Practice, 3rd ed. Blackwell Scientific,<br />

Oxford, UK.

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