NuPAGE® Bis-Tris Precast Gels
 | NuPAGE® Bis-Tris Gels are precast polyacrylamide gels designed to give optimal separation of small to medium-sized proteins during gel electrophoresis. NuPAGE® Bis-Tris gels have a neutral pH environment that minimizes protein modifications resulting in sharper bands without typical gel "smiling" (Figure 1). NuPAGE® Bis-Tris gels can be used for sequencing, mass spectrometry, and any other application in which protein integrity is crucial. NuPAGE® Bis-Tris Gels are designed to allow:
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Choose The Right NuPAGE® Bis-Tris Gel
| Number of Wells | Gel Thickness | Gel Percentage | Gel Sizes |
|---|---|---|---|
Figure 1: Side by Side Comparison of Bis-Tris Gels
 | A. Bio-Rad Criterion™ XT 4-12% Bis-Tris Gel w/ MOPS, and B. NuPAGE® Novex 4–12% Bis-Tris Midi Gel w/ MOPS. Each lane contains 5 µL Mark12™ Unstained Standard. |
Getting Started with NuPAGE® Bis-Tris Gels
Get optimal separation of your proteins by choosing the right combination of gel and running buffer. Here is brief summary of the available configurations. See “Choose The Right NuPAGE® Bis-Tris Gel” above to get the specific product ordering information. See Recommended Well Loading Volumes & Sample Loads.
Polyacrylamide Concentrations
NuPAGE® Bis-Tris mini gels are available in 3 different polyacrylamide concentrations: 10%, 12%, and 4–12% gradient. We also offer 8% gels in the midi gel format.
Gel Sizes
NuPAGE® Bis-Tris gels are available as mini gels (10 cm x 10 cm) and midi gels (8.7 cm x 13.3 cm). Both mini gels and midi gels are available with 1.0 mm gel thickness. The 1.5 mm gel thickness is only available with the mini gel format.
Buffering Systems
NuPAGE® Bis-Tris gels are Bis-Tris-HCl buffered (pH 6.4) and have an operating pH of about 7.0. All of the gels can be run using either NuPAGE® MES SDS or NuPAGE® MOPS SDS running buffer to obtain different separation ranges.
Protein Size
Proteins (14–200 kDa)
Use NuPAGE® Bis-Tris Gels with NuPAGE® MOPS SDS Running Buffer to resolve proteins (14–200 kDa).
Small Molecular Weight Proteins (2–200 kDa)
Use NuPAGE® Bis-Tris Gels with NuPAGE® MES SDS Running Buffer to resolve small molecular weight proteins (2–200 kDa).
The NuPAGE® Bis-Tris discontinuous buffer system involves three ions:
- Chloride (–) from the gel buffer and serves as a leading ion due to its high affinity to the anode relative to other anions in the system. The gel buffer ions are Bis-Tris+ and Cl– (pH 6.4).
- MES or MOPS (–) serve as the trailing ion in the running buffer. The running buffer ions are Tris+, MOPS-/MES–, and dodecylsulfate- (pH 7.3–7.7).
- Bis-Tris (+) is the common ion present in the gel buffer and running buffer. The combination of the lower pH gel buffer (pH 6.4) and the running buffer (pH 7.3–7.7) results in a significantly lower operating pH of 7 during electrophoresis.
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NuPAGE® Green BenefitsThe green features of NuPAGE® SDS-PAGE Gel products include:
To learn more, download the NuPAGE® Precast Gels Green Features Fact Sheet |
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Resources for NuPAGE® Bis-Tris Gels | ||||
