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4X SDS Sample Loading Buffer for Western Blotting

This SDS sample loading buffer recipe is ideal for preparing and loading protein samples into gels for polyacrylamide gel electrophoresis analysis. This recipe calculator enables the accurate preparation of a 4X SDS sample loading buffer for any volume that you need. Input your desired volume, click the CALCULATE button, and the table will populate with the amounts of each component needed.

4X Solution concentrations:

  • Tris-HCl: 0.2 M
  • DTT: 0.4 M
  • SDS: 277 mM, 8.0% (w/v)
  • Bromophenol blue: 6 mM
  • Glycerol: 4.3 M
7.5 mL Recipe Desired Volume: mL
1.5 mL 1 M Tris-HCl pH 6.5 (20-160)
mL 1 M Tris-HCl pH 6.5
3 mL of 1 M DTT (dithiothreitol) (43816)
mL of 1 M DTT (dithiothreitol)
0.6 g of SDS (sodium dodecyl sulfate) (L3771) g of SDS (sodium dodecyl sulfate)
30 mg of bromophenol blue (B0126) mg of bromophenol blue
2.4 mL of glycerol (G5516) mL of glycerol
Adjust final volume to 7.5 mL with Milli-Q® Water Adjust final volume to mL with Milli-Q® Water
Make 500 µL aliquots and store at -20 °C.

Note: Should the solution appear orange/yellow, it may be necessary to raise the pH by adding a suitable base, such as 5 M NaOH, dropwise.
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