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[@bhijit]

Hi friends,

                 Continuing with my previous problem. I found that all my proteins have pI [isoelectric point] more than 9. I read from milipore site that in western blot the pI can affect the protein transfer to membrane.

                 Methanol strips the SDS from proteins and proteins are finally transferred to membrane - I was wondering whether really the pI will affect the SDS-PAGE followed by western blot OR the pI is imp only if use the proteins in native form ?


                 Any one faced problems with proteins with high pI [Transfer buffer is pH8.3 and protein pI is more than 9 so proteins will have positive charge and will not migrate towards the membrane]

[mdfenko]

with sds present pI is not important. pI is important for native separations.

you can try a CAPS buffer at pH 11 for the transfer.

i am attaching a book from millipore and you can download a manual from ge healthcare from this link:

western blotting - priciples and methods

Attached Files

•  protein blotting handbook.pdf   1.25MB   82 downloads