This product is a concentrated stock solution and should be diluted appropriately with distilled, deionized water or equivalent to its final working concentration. 2X SDS-PAGE Sample Buffer consists of 0.125 M Tris-HCl, 4% (w/v) SDS, 20% (v/v) Glycerol and 0.01% (w/v) bromophenol blue. The pH of this solution is 6.8. Meticulously prepared using ultra pure reagents dissolved in highly polished pharmaceutical grade deionized water.