NuPAGE™ LDS Sample Buffer (4X)

DTT is not stable, so it must be added and the reduction performed just prior to loading your samples.

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Precipitation of the LDS or SDS at 4 degrees C is normal. Bring the buffer to room temperature and mix until the LDS/SDS goes into solution. If you do not want to wait for it to dissolve, you can store the sample buffer at room temperature.

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While they are both Bis-Tris based gels, the chemistries are very different since Bolt gels are optimized for western blotting. Another key difference is the wedge well design of the Bolt gels, which allows larger sample volumes to be loaded.

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The neutral operating pH of the NuPAGE Gels and buffers provides following advantages over the Laemmli system:
-Longer shelf life of 8-12 months due to improved gel stability
-Improved protein stability during electrophoresis at neutral pH resulting in sharper band resolution and accurate results (Moos et al, 1998)
-Complete reduction of disulfides under mild heating conditions (70 degrees C for 10 min) and absence of cleavage of asp-pro bonds using the NuPAGE LDS Sample buffer (pH > 7.0 at 70 degrees C)
-Reduced state of the proteins maintained during electrophoresis and blotting of the proteins by the NuPAGE Antioxidant
Please refer to the following paper: Moos M Jr, Nguyen NY, Liu TY (1988) Reproducible High Yield Sequencing of Proteins Electrophoretically Separated and Transferred to an Inert Support. J Biol Chem 263:6005-6008.

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The composition of the 1X NuPAGE LDS Sample Buffer is as follows:

141 mM Tris base
106 mM Tris HCl
2% LDS
10% Glycerol
0.51 mM EDTA
0.22 mM SERVA Blue G
0.175 mM Phenol Red
pH 8.5


To prepare 10 mL of 4 X NuPAGE LDS Sample Buffer, dissolve the following reagents to 8 mL ultrapure water:

Tris HCl 0.666 g
Tris Base 0.682 g
LDS 0.800 g
EDTA 0.006 g
Glycerol 4 g
SERVA Blue G (1 solution) 0.75 mL
Phenol Red (1 solution) 0.25 mL

Mix well and adjust the volume to 10 mL with ultrapure water. Store at +4. The buffer is stable for 6 months when stored at +4°C.

Find additional tips, troubleshooting help, and resources within our Protein Gel 1D Electrophoresis Support Center.