Vorum Silver Stain Method
1) Fix 2-18 hrs. (50% MeOH/12% HoAc, 0.05% formalin), 1 liter/gel
2) Wash three times in 35% EtOH/water for 20 min
3) Wash twice in distilled water for 10 minutes
4) Sensitize 2 min with 0.5L of 100 mM sodium thiosulfate, 30 mM potassium ferricyanide
5) Wash in 0.5 L water for 10 min. four times
6) Stain 20 min. with 1 L 0.2% silver nitrate, 0.076% formalin
7) Wash in water 1 min. twice
8) Develop till dark enough with 1 L of 6% sodium carbonate, 0.05% formalin, 0.0004% sodium thiosulfate
9) Stop 5 min. with 1 L of 50% MeOH/12% HoAC
10) Store in 1% HoAc/water Desiderio Silver Destain
11) Water 5 min (3X)
12) Destain whole gel 15 min. with 1:1 v/v 30mM potassium ferricyanide and 100 mM
sodium thiosulfate prepared fresh
13) Water 5 min. (10X)
14) Proceed to Vorum procedure and fix for 2 hrs and redo silver stain
*Destain is useful if background darkens faster than the protein bands or if the gel is not stopped quickly enough and is generally too dark.