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Immunoblotting Immunoblotting, often known as western blotting, is a technique for separating proteins by molecular weight. Two gels are created in this technique: a stacking gel pH (6.8) and a separating gel pH (8.8). The samples are put onto an acidic stacking gel, which separates proteins poorly but allows them to form narrow, highly defined bands. Smaller proteins travel quicker than larger protein molecules on a separating or resolving gel used to separate proteins based on their size. When voltage is supplied to the protein before loading, it is denatured and has a negative charge that travels towards the positive electrode. After the protein separation, the gel is sliced and inserted in a sandwich of fibre pad and filter sheets with a membrane (PVDF or nitrocellulose) and placing it in the tank with the transfer buffer with overnight transfer of protein to the membrane. After the protein has been transferred to the membrane, it is blocked by blocking solution to prevent antibodi...