How different concentrations of Running Buffers effects Gel Electrophoresis
AE and TBE Running Buffers
WHAT ARE TRIS ACETATE EDTA AND TRIS BORATE EDTA?
Tris acetate EDTA (TAE) and tris borate EDTA (TBE) are the two most common running buffers used in nucleic acid electrophoresis. As buffers, they have a fairly constant pH and are able to conduct electricity because of their concentration of hydrogen ions. These properties are necessary for gel electrophoresis during which proteins are separated by electric charge.
PREPARING RUNNING BUFFERS
TBE and TAE are most often mixed from their constituent parts into laboratory stock solutions. Both buffers can be purchased at the working concentration or in a powdered or concentrated format that is simply prepared via dilution.
Refer to the recipes below to prepare TAE and TBE in common stock solution concentrations. Our buffer calculator can also help you find the correct dilution (or conversion) for various buffers from stock solution to a desired molarity and volume.
VIDEO: TAE AND TBE BUFFERS FOR GEL ELECTROPHORESIS
Review common TAE and TBE buffer solution recipes and learn which running buffer to choose for your nucleic acid gel electrophoresis application. Research technology specialist Chris Lemke mixes up stock solutions and provides helpful buffer selection tips.
TAE Buffer 50x Stock Recipe
242 g tris base in double-distilled H2O
57.1 ml glacial acetic acid
100 ml 0.5 M EDTA solution (pH 8.0)
Adjust volume to 1 L.
10x TAE Recipe
For 1L of 10x solution,
48.5 g tris
11.4 mL glacial acetic acid
20 mL EDTA (pH 8.0)
1x TAE Recipe
Dilute 1:10
0.4 M tris acetate (pH approximately 8.3)
M EDTA
using ultrapure water.
TBE Buffer 10x Stock Recipe
108 g tris base
55 g boric acid
900 ml double-distilled H2O
40 ml 0.5 M EDTA solution (pH 8.0)
Adjust volume to 1 L.
1x TBE Preparation
Dilute 10x concentrated TBE buffer 10-fold with ultrapure water.
The final solution should contain:
M tris (pH 7.6)
45 mM boric acid
2.5 mM EDTA
Buffer Prep Tips
If precipitation is present, warm to 37 °C and mix until completely dissolved prior to dilution.
It is recommended 1x working solutions be filtered through a 0.2 mm filter before use.
1x working solutions can be used until the expiration date on packaging with storage at room temperature. Discard if buffer becomes cloudy or discolored.
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