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Foam appeared while DNA electrophoresis I've never seen this kind of thing happen. What might trigger this??

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  • $\begingroup$ Looks like an agarose gel. What buffer did you use? Did you happen to clean the tank (incompletely) using a detergent? $\endgroup$
    – WYSIWYG
    Apr 3, 2019 at 7:46

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Gas bubbles are foamed by electrolysis of water, generating bubbles of hydrogen gas on the negative electrode and oxygen gas on the positive electrode.

As for the foam itself... I am guessing there is some form of detergent in the buffer. Some electrophoresis buffers do contain detergent.

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