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Ethidium bromide (EtBr) is the most widely used fluorescent dye in nucleic acid gel electrophoresis since decades. However it has been essentially forgotten in DNA quantification by spectrofluorimetry. While investigating sensitivity and dynamic range of available fluorochromes, we found that EtBr permits much more sensitive fluorimetric measurements than previously thought. We report here a revised, accurate, and easy-to-use protocol for EtBr-based DNA quantification in solution, which usefully complements the widely used indirect quantification on agarose gels.

Protocol for high-sensitivity/long linear-range spectrofluorimetric DNA quantification using ethidium bromide