Abstract
Protein blotting, also known as Western blotting, refers to the transfer of proteins to an immobilizing membrane. The most widely used blotting method is the electrophoretic transfer of resolved proteins from a polyacrylamide gel to a nitrocellulose or polyvinylidene difluoride (PVDF) sheet and is often referred to as “Western blotting.” Electrophoretic transfer uses the driving force of an electric field to elute proteins from gels and to immobilize them on a matrix. This method is fast, efficient and maintains the high resolution of the protein pattern (1). There are currently two main configurations of electroblotting apparatus: (1) tanks of buffer with vertically placed wire (see Chapter 58) or plate electrodes and (2) semidry transfer with flat-plate electrodes.
For semidry blotting, the gel and membrane are sandwiched horizontally between two stacks of buffer-wetted filter papers which are in direct contact with two closely spaced solid-plate electrodes. The name semidry refers to the limited amount of buffer which is confined to the stacks of filter paper. Semidry blotting requires considerably less buffer than the tank method, the transfer from single gels is simpler to set up, it allows the use of multiple transfer buffers (i.e different buffers in the cathode and anode electrolyte stacks) and it is reserved for rapid transfers because the amount of buffer is limited and the use of external cooling is not possible. Nevertheless, both techniques have a high efficacy and the choice between the two types of transfer is a matter of preference.
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Gravel, P. (2009). Protein Blotting by the Semidry Method. In: Walker, J.M. (eds) The Protein Protocols Handbook. Springer Protocols Handbooks. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59745-198-7_59
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