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Coomassie Staining
Introduction
Instructions for staining E-PAGE
™
Gels using Coomassie R-250 are described in
this section.
To obtain maximum sensitivity, the total staining time for Coomassie R-250
staining is 1.5 h plus overnight destaining. The use of the Coomassie R-250
microwave protocol reduces the amount of time needed for staining and
destaining, however for minimal background, overnight destaining is
recommended.
Materials Needed
You will need the following items for staining one E-PAGE
™
Gel:
•
Clean staining containers or incubation trays (if using the Coomassie R-250
microwave protocol, make sure the container is
microwave safe
. Do NOT
use the Incubation Tray cat no. LC2102)
•
Rotary shaker
For Coomassie R-250 Staining
•
Coomassie R-250 Stain (see note below)
•
Destaining solution (8% acetic acid in deionized water, see note below)
•
Methanol (regular protocol only)
•
Ethanol (microwave protocol only)
•
2 pieces of nylon membrane (microwave protocol only)
The volume of fixing, staining and destaining solutions will depend on the
volume of your staining container. To obtain good results, the volume of solution
must be sufficient to cover the gel completely and to allow the gel to move freely
during all of the steps.
When using the Coomassie R-250 microwave staining protocol, warm the
Coomassie R-250 stain and destaining solution to 50°C without boiling.
It is
important NOT to boil the solutions.
Since microwave ovens differ significantly, we recommend testing various times
(10 second intervals) and power settings of your microwave oven to achieve a
temperature of 50°C in the volume of solution required for your particular
staining container. Perform these steps without the gel.
Once you have optimized the time and settings for your microwave, use these
settings for staining.
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