Sometimes when i run my samples, the dye becomes more diffuse and spreads out more when it enters the resolving gel, while other times it is much narrower and darker...Does it indicate anything, regarding the content of protein in the sample?
Are you sure this isn't a result of inconsistencies in the gel itself? If you pour your own gels (rather than buy them pre-made from a company), you can create batch-to-batch variability if you're not careful. I've found this to be a big reason for the occasional broad "smeared" bands. The dye front itself generally shouldn't look too different between gels. Here are a couple links I've found useful in the past which can help in troubleshooting SDS PAGE:
https://www.ruf.rice.edu/~bioslabs/studies/sds-page/gellab3.html
https://www.ruf.rice.edu/~bioslabs/studies/sds-page/rf.html
As far as I know, the dye front does not indicate anything else.
If sample buffer is old or temperature fluctuations while running means just bit of gel heating.
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