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No deben combinarse los siguientes MAPmates™: -MAPmates™ que requieren un tampón de ensayo diferente. -Pares MAPmate™ fosfoespecíficos y totales, por ejemplo, GSK3β y GSK3β (Ser 9). -MAPmates™ con panTyr y específicos de sitio; por ejemplo, receptor del fosfo-EGF y fosfo-STAT1 (Tyr701). -Más de 1 fosfo-MAPmate™ para una sola diana (Akt, STAT3). -La GAPDH y la β-tubulina no pueden combinarse con kits o MAPmates™ que contengan panTyr.
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Custom Premix Selecting "Custom Premix" option means that all of the beads you have chosen will be premixed in manufacturing before the kit is sent to you.
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96-Well Plate
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Añadir más reactivos (Se necesita tampón y un kit de detección para usar con MAPmates)
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48-602MAG
Buffer Detection Kit for Magnetic Beads
1 Kit
Opción para ahorrar espacio Los clientes que adquieran múltiples kits pueden optar por ahorrar espacio de almacenamiento retirando el embalaje del kit y recibiendo los componentes de sus ensayos multiplex en bolsas de plástico para un almacenamiento más compacto.
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Atención: Nos hemos mudado. Los productos Merck Millipore ya no pueden adquirirse en MerckMillipore.comMás información
Related Resources: Brochures | Application NotesElectrotransfer refers to the standard procedure for transferring proteins from a polyacrylamide gel (SDS-PAGE) onto an Immobilon® PVDF transfer membrane. The two commonly used electrotransfer techniques are tank transfer and semi-dry transfer. Both are based on the same principles and differ only in the mechanical devices used to hold the gel/membrane stack and applications of the electrical field.
Click on the Semi-dry or Tank Electrotransfer symptoms to read about the possible causes and remedies:
The entire membrane must be pre-wet with methanol; the entire membrane should change uniformly from opaque to semi-transparent.
Air bubbles under membrane and between other layers in the stack
Effect of air bubbles between gel and membrane during Western blot transfer step
Using a pipette or stirring rod, gently roll out any trapped air bubbles while assembling the stack.
Uneven contact between gel and membrane
Make sure entire gel and membrane surfaces are in good contact.
Too much heat generated during the transfer
The temperature of the run should not exceed 20 °C. For a tank transfer, pre-chill the buffer or carry out the transfer in a cold room. For a semi-dry transfer, either shorten the run time, increase the number of filter papers, or reduce the current.
Filter paper dried out during semi-dry transfer
Make sure filter paper is thoroughly drenched prior to transfer or use additional sheets. Be sure the stack is assembled in less than 15 minutes.
Proteins transferred too rapidly; protein buildup on the membrane surface
Increase the time the proteins have to interact with membrane by reducing the voltage by as much as 50%.
Highly negatively charged proteins (due to high aspartic acid and glutamic acid content) tend to move very fast in an electric field. Decrease the voltage to slow down migration of these proteins.
Presence of SDS in the gel may inhibit protein binding. Equilibrate the gel in the transfer buffer for at least 15 minutes
Gel (top) and blot (bottom) show that equilibration improves transfer efficiency for Western blot.
Methanol concentration in transfer buffer is too low to facilitate removal of SDS. Increase the methanol to 15 – 20%, especially for smaller molecular weight proteins.
The membrane must be pre-wet with methanol; the entire membrane should change uniformly from opaque to semi- transparent.
If the methanol concentration in the transfer buffer is too high, it can remove SDS from proteins and lead to protein precipitation in the gel. This would reduce the transfer of large molecular weight proteins out of the gel. If protein precipitation is an issue, the transfer buffer can be supplemented with SDS (0.01% – 0.05%) to aid in solubility. In addition, excess methanol can tend to shrink or tighten a gel, thus inhibiting transfer of large molecular weight proteins.
Isoelectric point of the protein is at or close to the pH of the transfer buffer
A protein that has the same isoelectric point as the pH of of the transfer buffer will have no net charge and thus will not migrate in an electric field. To facilitate transfer, try a higher pH buffer such as 10 mM CAPS buffer at pH 11, including 10% methanol or a lower pH buffer such as an acetic acid buffer.
Poor detection when urea is used in the gel and/or transfer buffer
Reduce the temperature by using a circulating buffer setup or run your transfer in a cold room. Urea in the presence of heat can cause carbamylation of proteins, which can change the charge of amino acids in a protein. This could affect the epitopes essential for antibody recognition and binding.
Incomplete transfer of proteins
Stain the gel to check for residual proteins. If transfer was not complete, review your transfer technique.
Poor protein retention
Once transfer is complete, be sure to dry the membrane completely to obtain optimal binding and fixation of the proteins. This should be done prior to any downstream detection method.
Poor Transfer of Large Molecular Weight Proteins (~ >80 kDa)
Possible Cause
Remedy
Methanol concentration is too high
Reducing the methanol concentration to 10% (v/v) or less should help in the transfer of large molecular weight proteins by allowing the gel to swell. Moreover, a lower methanol percentage would also reduce SDS loss from the proteins and reduce protein precipitation in the gel. Proteins >200 kDa are not as sensitive to interference from the SDS in binding to membrane as are proteins <100 kDa.
