Hello Verma, here are few points I read about concerning the addition of SDS to western blot transfer

1. Addition of 0.1% SDS detergent to Tris, glycine, methanol buffer has been reported to increase transfer efficiency especially for high molecular weight proteins. SDS, however, increases relative current, power, and heating. Also, temperatures below 10°C may precipitate the SDS so the starting buffer temperature will be higher. SDS may also affect the antigenicity of some proteins. SDS will aid in eluting the proteins from the gel, but it may reduce the binding efficiency of those proteins to the

membrane.

2. Large proteins (>100,000 daltons) denatured by SDS may transfer poorly due to the addition of alcohol to the transfer buffer. Alcohol increases binding of SDS-proteins

to nitrocellulose, but decreases pore sizes in the gel. Elimination of alcohol from SDS-protein transfers results in considerably diminished binding. Adding SDS (up to 0.1%) to the transfer buffer increases the transfer efficiency of proteins, but reduces the amount of binding to the membrane.

3. PVDF membrane exhibits better binding efficiency of blotted material in the presence of SDS in the transfer buffer. PVDF must first be wetted in 100% MeOH but can then be used in buffer, which does not contain MeOH.

SDS may be added to promote elution of proteins from gels.

1. Do not use the same batch of transfer buffer more than once, as the buffer will likely lose its capacity to maintain a stable pH during transfer

2. Do not dilute the transfer buffer; this will also decrease buffering capacity

3. Do not adjust the pH of transfer buffers when not indicated, as this increases buffer conductivity, which is manifested by higher initial current output and decreased resistance

Hello Verma, here are few points I read about concerning the addition of SDS to western blot transfer

1. Addition of 0.1% SDS detergent to Tris, glycine, methanol buffer has been reported to increase transfer efficiency especially for high molecular weight proteins. SDS, however, increases relative current, power, and heating. Also, temperatures below 10°C may precipitate the SDS so the starting buffer temperature will be higher. SDS may also affect the antigenicity of some proteins. SDS will aid in eluting the proteins from the gel, but it may reduce the binding efficiency of those proteins to the

membrane.

2. Large proteins (>100,000 daltons) denatured by SDS may transfer poorly due to the addition of alcohol to the transfer buffer. Alcohol increases binding of SDS-proteins

to nitrocellulose, but decreases pore sizes in the gel. Elimination of alcohol from SDS-protein transfers results in considerably diminished binding. Adding SDS (up to 0.1%) to the transfer buffer increases the transfer efficiency of proteins, but reduces the amount of binding to the membrane.

3. PVDF membrane exhibits better binding efficiency of blotted material in the presence of SDS in the transfer buffer. PVDF must first be wetted in 100% MeOH but can then be used in buffer, which does not contain MeOH.

Hi,

I can add from personal experience, that washing the gel in transfer buffer before the transfer, to get rid of residual SDS-buffer, helps a lot in how nicely the protein gets transferred on the membrane.