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Handling Ethidium Bromide

See requirements for UC San Diego researchers working with ethidium bromide.

Ethidium bromide (C21H20BrN3) is a potent mutagen used as a nucleic acid stain. Ethidium bromide requires extra precautions during use and disposal because of its highly toxic and mutagenic properties.

Requirement for researchers

UC San Diego researchers working with potentially mutagenic materials such as ethidium bromide must complete a hazard control plan (HCP) obtained through the Chemical Hazard Use Application (CHUA). This HCP must be preapproved by the principal investigator prior to beginning any work with this material. Information on this Blink page is supplementary and is not intended to replace the approved HCP.

Never work alone when working with hazardous chemicals.

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Obtain approval before beginning work.

Get approval from your principal investigator before beginning a project involving ethidium bromide.

Evaluate the hazards before beginning work.

  • Consult safety resources available on:
  • Consider these hazards specific to ethidium bromide:
    • In powder form, ethidium bromide is an irritant to the upper respiratory tract, eyes, and skin.
    • Ethidium bromide is strongly mutagenic, causing living cell mutations. Even though there is no evidence at this time of human carcinogenicity or teratogenicity, this material should be considered a possible carcinogen or teratogen.
  • If possible, use a less dangerous product that can perform the same task.
    • New fluorescent dyes have been developed that manufacturers, such as Molecular Probes Inc. and FMC Corporation, claim are less toxic and have greater detection sensitivity than ethidium bromide.

Be prepared for accidental spills.

Ethidium bromide spills are very serious and require immediate cleanup.

Some facilities use a hand-held ultraviolet (UV) lamp to check for residual ethidium bromide contamination following spill cleanup. A reddish-orange fluorescence can be detected under both "long" and "short" UV wavelengths.

Use of a handheld UV lamp to detect traces of ethidium bromide may serve as an occasional check of laboratory practices, but it cannot substitute for good cleanliness and careful contamination control.

Be aware of these limitations:

  • The ability of hand-held UV lamps to detect small spills is not guaranteed.
  • Ease of detection depends upon a variety of factors including:
    • Chemical composition of the sample
    • Wavelength of the UV lamp
    • Intensity of the lamp

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Notice: Disposal of hazardous waste using sinks, intentional evaporation, or as regular trash is against the law. Campus laboratories must abide by strict state and federal waste disposal requirements. You may be held liable for violations of applicable laws.