Brilliant Cresyl Blue ALD

certified by the Biological Stain Commission

Brilliant Blue C, 3-Amino-7-(diethylamino)-2-methylphenoxazin-5-ium (T-4)-tetrachlorozincate (2:1), Brilliant Cresyl blue
Linear Formula:
C17H20N3OCl · 1/2ZnCl2
CAS Number:
Molecular Weight:
Colour Index Number:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


certified by the Biological Stain Commission




Dye content, ≥60%


hematology: suitable
histology: suitable


water: 1 mg/mL, blue to very deep blue

Featured Industry

Diagnostic Assay Manufacturing

storage temp.

room temp



InChI key



Brilliant Cresyl Blue ALD has been used for the selection of oocytes. It has also been used for the selection of cumulus-oocyte complexes (COCs).


10 g in glass bottle

Biochem/physiol Actions

Brilliant Cresyl Blue ALD is mainly used for the selection of oocytes. It helps in determining the activity of glucose-6-phosphate dehydrogenase (G6PD). This enzyme is generated in growing oocytes. However, oocytes which complete their growth have low levels of G6PD. Low G6PD activity results in blue coloration of the cytoplasm because brilliant cresyl blue is not reduced to a colourless compound. It is also used for the staining in reticulocytes, where the dye stains reticulin.


Certified as a supravital stain for reticulocytes.

Other Notes

The structure of Brilliant Cresyl Blue ALD contains a 2-methyl modification on the phenoxazine core, while the structure of the historic Brilliant Cresyl Blue contains a 8-methyl modification on the phenoxazine core. The biological staining application is the same for both structures.

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
Vitrification of immature and matured bovine oocytes: effect of brilliant cresyl blue selection and hyaluronan addition.
Animal Reproduction, 13 (2016)
Developmental competence of prepubertal goat oocytes selected with brilliant cresyl blue and matured with cysteamine supplementation.
Rodriguez-Gonzalez E, et al.
Reproduction, Nutrition, Development, 43, 179-179 (2003)
Liqin Wang et al.
Journal of biomedicine & biotechnology, 2012, 161372-161372 (2012-06-08)
Sheep oocytes derived from the ovaries collected from the slaughterhouse are often used for research on in vitro embryo production, animal cloning, transgenesis, embryonic stem cells, and other embryo biotechnology aspects. Improving the in vitro culture efficiency of oocytes can...
A Zh Baltabekova et al.
Molecular biotechnology, 57(8), 746-755 (2015-04-04)
Immunoglobulin E (IgE) plays a central role in type I hypersensitivity including allergy and asthma. Novel treatment strategy envisages development of a therapeutic vaccine designed to elicit autologous blocking antibodies against the IgE. We sought to develop an IgE-epitope antigen...
Cheesbrough M
District Laboratory Practice in Tropical Countries (2006)

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