EtBr light sensitivity

Marko Dolinar Marko.Dolinar at IJS.SI
Mon Apr 7 03:13:30 EST 1997

Dear colleagues,

I know there have been many discussions on the mutagenicity and
disposal of ethidium bromide (EtBr) in the last few years. Several
methods for the removal/disposal of EtBr have been described, but I
still have one question: 
Since EtBr is light-sensitive, wouldn't it be sufficient to keep EtBr
waste in a white glass container on the window-shelf or near the
bactericidal UV-light for a couple of days (?weeks) and EtBr would get
Another question: Is EtBr which gets destained (looses its red colour)
still mutagenic?

Thanks in advance for your replies.

Marko Dolinar
Dept. Biochem. & Mol. Biol.
J. Stefan Institute
Ljubljana, Slovenia

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