electroblotting

Electrophoresis
Development & Consulting
Dr. Hanspeter Schickle
Wolfgang Gstrein

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electro-blotting (western blotting)

April 28, 2023


	Normally the gel have to be cut from the film support before starting the blotting process! This job is done by GE’s “Film Remover” (GE 18-1013-75), see pictures below. Soon available: from EDC’s new Blotgels the support can be rolled away easily ---> BlotGels


	To be flexiblewith sample volumes we recommend to use gels without slots (SDS: edc-4209)





		Picture and info courtesy: Karine Lallemand, ALK France


	Semi-Dry blotting unit (Dyeagnostics, Halle)


	Procedure with normal film supported gels

	...the gel is already cutted off the film support using the film-remover.

	Procedure with EDC’s new BlotGels

	...the support is simply rolled away from the BlotGel




	we recommend to do the blot between 2 graphite plates: “semi-dry blotting”

Transfer buffers (Discontinuous buffer system)
Anode solution I:
0.3 mol/L Tris (36.3 g), 20% (v/v) methanol200 mL, make up to 1 L with distilled water.
Anode solution II:
25 mmol/L Tris (3.03 g), 20 %(v/v) methanol 200 mL, make up to 1 L with distilled water.
Cathode solution:
40 mmol/L ε-aminocaproic acid (5.2 g), 0.01% (w/v) SDS0.1 g, 20% (v/v) methanol200 mL,
make up to 1L with distilled water.

Blotting procedure
Wet the graphite anode plate (the plate with the red cable) with distilled water, remove the excess water with tissue paper.
Cut the necessary filter papers (6 for the anode I, 3 for anode II, 9 for the cathode) and the blotting membrane to the size of the gel.
Slowly soak 6 filter papers in anode buffer I, and place the stack in the middle of the blotting plate.
Soak the blot membranes in anode buffer II and place them on the stack.
Cut the gel from the film, see above. The film-gel sandwich is still together and is placed flat on the lab-bench.
Slowly soak 3 filter papers in anode buffer II and place the stack on top of the first stack.
Then, with a roller the dry blotting membrane is rolled on the gel.
Turn the sandwich around, so that the support-film is on top.
With a spatula the support-film is carefully lift upward so that...
          Nitrocellulose-Membrane
            ...the gel is remaining on the membrane
          PVDF-Membrane
           ...the gel is detached from the support with a spatula and is falling on the membrane with some crinkles.
              Dunk this sandwich under 100% Methanol and there the gel’s crinkles are evened onto the
              membrane with a spatula
Grasp the membrane and the gel on 2 corners and place this sandwich -membrane down- on the Anode II stack
Slowly soak 9 filter papers in cathode buffer and apply the stack onto the gel.
Apply the cathodal electrode plate and start the electro-transfer (no cooling)


	Runnings

10 V

80 mA / cm**2

normal gel: 400 mA

1 h

Staining


	Coomassie-stain inside the gel...


	...PVDF-membrane: electroblot and Fast Green stain


		xx-membrane: electroblot and xx- stain



			Picture courtesy: Karine L’Allemand ALK France


	EDC Electrophoresis Development & Consulting, Vor dem Kreuzberg 17, 72070 Tübingen (Germany)