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Coomassie Brilliant blue G 250 (C.I. 42655)

for electrophoresis

Coomassie Brilliant blue G 250 (C.I. 42655)
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:
EC Index Number:

Quality Level


>5000 mg/kg LD50, oral (Rat)


protein staining: suitable


6.4 (20 °C, 10 g/L in H2O)


40 g/L

bulk density

520 kg/m3

storage temp.

no temp limit



InChI key


General description

Coomassie Brilliant blue G 250 (C.I. 42655) is a member of Coomassie brilliant blue (CBB), which is a triphenyl methane dye. CBB dyes are widely used for the visualization of proteins separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. CBB G-250 (greenish tinted blue) dye is preferably used in Bradford assay for the quantification of proteins.


Coomassie Brilliant blue G 250 (C.I. 42655) has been used to stain gel in sodium dodecyl sulfate-polyacrylamide gel electrophoresis. It has also been used in Bradford protein assay.

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Absorption maximum λmax. (buffer pH 7.0): 577 - 584 nm
Spec. Absorptivity A 1%/1cm (λmax; 0.01 g/l; buffer pH 7.0; calc. on dried substance): 450 - 570
TLC-Test: passes test
Loss on drying (110 °C): ≤ 8 %
Suitability for electrophoresis: passes test

Legal Information

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Robert G E Krause et al.
Analytical biochemistry, 566, 107-115 (2018-11-21)
Coomassie brilliant blue R250, an anionic dye is the most popular stain to detect proteins resolved in SDS-PAGE gels. Crystal violet, a cationic dye was found to be versatile and stained proteins in SDS-PAGE gels and in zymograms. Stained proteins...
Nazim Mekaoui et al.
Journal of chromatography. A, 1232, 134-141 (2011-12-22)
Commercial samples of Coomassie Brilliant Blue G-250 (CBB) were not pure enough to give reliable results when used as indicator of amine content in biological material. The polar and apolar impurities produce unacceptable biases in the results. Counter current chromatography...
Gang Lu et al.
Bio-protocol, 10(6), e3565-e3565 (2021-03-05)
Although many spherical and rod-shaped plant virus purification protocols are now available, only a few protocols on filamentous plant virus purification have been published. Here, we report a protocol for large-scale purification of Rice stripe virus (RSV) from RSV-infected rice...
Mohammad-Bagher Ebrahim-Habibi et al.
Scientific reports, 9(1), 1273-1273 (2019-02-06)
Investigation of non-covalent interaction of hydrophobic surfaces with the protein G (PrG) is necessary due to their frequent utilization in immunosensors and ELISA. It has been confirmed that surfaces, including carbonous-nanostructures (CNS) could orient proteins for a better activation. Herein...

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