NuPAGE Bis-Tris Precast Gels

Invitrogen NuPAGE Bis-Tris Gels are high-performance gels that offer optimized chemistry for high sensitivity applications. 

Performance dataInteractive selection tool

Available NuPAGE Bis-Tris Gels
Migration charts

NuPAGE Bis-Tris Gels are precast polyacrylamide gels designed to give optimal separation for a wide range of molecular weight 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.” NuPAGE Bis-Tris Gels can be used for western blotting, sequencing, mass spectrometry, and any other application in which protein integrity is crucial.

Features of the NuPAGE Bis-Tris Gels include:

  • Better protein integrity—optimized sample preparation process preserves your proteins
  • Wide ranges of molecular weight separation—selecting the right gel and running buffer helps to achieve the optimal separation of your proteins
  • Faster run times—separation of your proteins can be attained in as little as 35 minutes
  • Longer shelf life— gels can be stored for at least 12 months at room temperature

NuPAGE Bis-Tris Gels are formulated for denaturing gel electrophoresis applications. For optimal sample preparation, we recommend using buffers containing SDS. The gels can be run using MES SDS running buffer to better resolve small proteins and MOPS SDS running buffer to resolve medium- to large-size proteins. 

NuPAGE Bis-Tris Gels use a bis-tris discontinuous buffer system involving three ions:

  • Chloride (–) is 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 (–) serves as the trailing ion in the running buffer. The running buffer ions are tris (+), MOPS/MES (–) and dodecylsuflate (pH 7.3–7.7).

Bis-tris (+) is the common ion present in the gel buffer and running buffer. The combination of 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. 

Available gel sizes Mini: 8 cm x 8 cm (1 or 1.5 mm thick) 
Midi: 8 cm x 13 cm (1 mm thick)
Storage conditions Room temperature
Shelf life 12 months
Recommended sample buffer LDS sample buffer
Recommended running buffers MES SDS or MOPS SDS
Gel chemistry Bis-tris
Available polyacrylamide concentrations 8%, 10%, 12%, 4–12%
Separation range 1.5–300 kDa
For use with (equipment) mini gels Mini Gel Tank or XCell SureLock Mini-Cell
For use with (equipment) midi gels Bio-Rad Criterion (with adapters only) or Invitrogen XCell4 SureLock Midi-Cell
Mode of separation Molecular weight

Currently using Tris-glycine or Tricine gels? Use the NuPAGE Gel conversion guide below to find the appropriate NuPAGE gel and corresponding optimized buffer. 

NuPAGE Gel conversion guide

If you are using: Then we recommend NuPAGE gel: Buffer system
Tris-Glycine gel
4% NuPAGE 3-8% Tris-Acetate Tris-Acetate
6% NuPAGE 3-8% Tris-Acetate Tris-Acetate
10% NuPAGE 8% Bis-Tris MOPS
NuPAGE 10% Bis-Tris MOPS
12% NuPAGE 10% Bis-Tris MOPS
14% NuPAGE 12% Bis-Tris MOPS
16% NuPAGE 12% Bis-Tris MES
18% NuPAGE 12% Bis-Tris MES
4-12% NuPAGE 3-8% Tris-Acetate Tris-Acetate
NuPAGE 4-12% Bis-Tris MOPS
4-20% NuPAGE 4-12% Bis-Tris MES
8-16% NuPAGE 4-12% Bis-Tris MOPS
10-20% NuPAGE 12% Bis-Tris MOPS
Tricine gel
10% NuPAGE 8% Bis-Tris MES
NuPAGE 10% Bis-Tris MES
16% NuPAGE 4-12% Bis-Tris MES
10-20% NuPAGE 4-12% Bis-Tris MES