For final concentration of gel ( % T):
  Separating gel (10 ml)  Stack gel stack gel
(10 ml) 5 ml
  7% 10% 12,5 % 15% 5%
30% Acrylamide-bis solution 29:1 (A) 2.33 3.33 4.17 5 1.67 0.835
4x Separation buffer 2.5 2.5 2.5 2.5 ­
1.5 M Tris/HCl pH 8.8 0
4x Stacking buffer   ­ ­ ­ 2.5 1.25
0.5 M Tris/HCl pH 6.8 + phenol red 0
aqua dest. 5 4 3.2 2.4 5.7 2.85
SDS (10 %) 0.1 0.1 0.1 0.1 0.1 0.05
TEMED  0.015 0.015 0.015 0.015 0.015 0.0075
APS (10%) 0.03 0.03 0.03 0.03 0.03 0.015
total ml 9.98 9.98 10.02 10.05 10.02
Acryl in (A) 0.699 0.999 1.251 1.5 0.501
Acryl % 7.01 10.02 12.49 14.93 5.00
SDS-sample buffer
final conc 6x 6X Sample Buffer (with DTT)
Tris/HCl pH6.8 0.125 0.75 1 M Tris-Cl (pH 6.8) 2.4 ml
Glycerol 10% 60% SDS 0.96 g
SDS 2% 12% Glycerol 4.8 ml
DTT 739 mg DTT 739 mg > ca. 600 mM > final conc. 100mM
Bromophenol blue 4.8 mg Bromophenol Blue 4.8 mg
Do not adjust the volume.
Reduction: either by 2% b-Mercaptoethanol 
(final conc., equals about 255 mM SH-groups, would mean about 125 mM DTT with 2 SH groups
STRIPPING BUFFER (2% SDS, 62.5mM TRIS pH6.8, 100mM Beta-mercaptoethanol (bME)
Reagent ml for 500ml ml for 100 ml
20% SDS 50 10
1M TRIS pH6.8 31.25 6.25
H2O 418.75 83.75
 
**ADD THE bME FRESH BEFORE USE**  
beta-Mercapto 3.55 0.71
Incubate the membrane for 15 - 30 min at 50ēc submerged in stripping buffer.