How is ethidium bromide prepared for gel electrophoresis?

Ethidium Bromide Solution Preparation and Recipe

  1. Prepare 800 mL of distilled water in a suitable container.
  2. Add 10 g of Ethidium bromide to the solution.
  3. Add distilled water until volume is 1 L.
  4. Stir on a magnetic stirrer for several hours to ensure that the dye has dissolved.

Why is ethidium bromide added to the agarose gel?

Ethidium Bromide (EtBr) is sometimes added to running buffer during the separation of DNA fragments by agarose gel electrophoresis. It is used because upon binding of the molecule to the DNA and illumination with a UV light source, the DNA banding pattern can be visualized.

How is ethidium bromide made?

EtBr belongs to a class of tricyclic aromatic heterocyclic compounds called phenanthridine (Fig. 1). Phenanthridine was originally obtained from destructive distillation coal. It was specifi- cally produced from the pyrolytic condensation of benzaldehyde and aniline at bright red flame.

How do you prepare agarose gel for gel electrophoresis?

1. Preparation of the Gel

  1. Weigh out the appropriate mass of agarose into an Erlenmeyer flask. Agarose gels are prepared using a w/v percentage solution.
  2. Add running buffer to the agarose-containing flask. Swirl to mix.
  3. Melt the agarose/buffer mixture.
  4. Add ethidium bromide (EtBr) to a concentration of 0.5 μg/ml.

How do you soak gel in ethidium bromide?

Soak the gel for 15 minutes with gentle agitation. Longer staining times will result in high background. Rinse the gel with ddi water and destain with fresh ddi water for 15 minutes with gentle agitation.

What can I use instead of ethidium bromide?

GelRed™ is a commercial DNA stain manufactured by Biotium. It is marketed as being the most safe, sensitive and robust nucleic acid gel stain- less mutagenic than ethidium bromide, but more stable in storage than SYBR®Safe. Like ethidium bromide, GelRed™ is visualized using UV light.

Why is ethidium bromide added at this step?

Why is ethidium bromide added at this step? Ethidium Bromide is needed to see the DNA bands in the gel under UV illumination. Such bubbles would interfere with the movement of the sample through the gel, distorting the results.

Is ethidium bromide a stain?

Ethidium bromide (2,7-diamino-10-ethyl-9-phenylphenanthridinium bromide) is used as a nucleic acid stain which fluoresces in the presence of ultraviolet (UV) light. It is commonly sold in a powder form which is soluble in water. The powder is dark red or purple in color.

What is the purpose of agarose gel?

Agarose gels? are typically used to visualise fragments of DNA. The concentration of agarose used to make the gel depends on the size of the DNA fragments you are working with. The higher the agarose concentration, the denser the matrix and vice versa.

Can you make agarose gel with water?

Combine 20 ml distilled water and one GelGreen® Agarose Tab™ for each gel you plan to pour. Swirl the flask or beaker until reagents are well mixed. Make sure GelGreen® Agarose Tabs™ fully disintegrate before proceeding. Expect to heat for about 45 seconds per 20 ml of liquid in a standard microwave.

What happens if you add too much ethidium bromide?

Adding too much ethidium on your gel can cause a lot of background fluorescence when visualising as well. Note that the SYBR Gold emission spectra is different from Ethidium Bromide as well so you might need a different filter on your imaging dock to see SYBR Gold-stained samples.

Does ethidium bromide bind ssDNA?

Ethidium bromide is a sensitive, easy stain for DNA. It yields low background and a detection limit of 1-5 ng /band. The major drawback to ethidium bromide is that it is a potent mutagen. Staining of denatured, ssDNA or RNA is relatively insensitive, requiring some 10 fold more nucleic acid for equivalent detection.