Stability of azure B-eosin Y staining solutions

Area of Science:

• Hematology
• Cytology
• Stain chemistry

Background:

• Accurate white blood cell differentiation relies on reliable staining techniques.
• The stability of common hematological stains like May Grunwald Giemsa (MGG) can be variable.
• Azure B-eosin Y offers potential as an alternative staining solution.

Purpose of the Study:

• To evaluate the stability of azure B-eosin Y staining solutions with varying compositions.
• To compare the stability of azure B-eosin Y with a routine May Grunwald Giemsa (MGG) stain.
• To identify optimal conditions for a stable and effective azure B-eosin Y stain.

Main Methods:

• Analysis of white blood cell density histograms using an image analysis computer.
• Systematic variation of dye concentrations, buffer molarity, and the inclusion of dimethylsulfoxide (DMSO).
• Assessment of staining capacity immediately after preparation and over time.

Main Results:

• Staining solution stability was found to be dependent on dye concentration, buffer molarity, and the presence of DMSO.
• Most staining solutions, including the routine MGG stain, exhibited a significant loss of staining capacity shortly after preparation.
• An optimized azure B-eosin Y mixture maintained satisfactory staining properties for at least 8 hours post-preparation.

Conclusions:

• The stability of hematological stains is influenced by formulation parameters.
• Dimethylsulfoxide (DMSO) can act as a stabilizer for azure B-eosin Y solutions.
• A specifically formulated azure B-eosin Y stain provides a stable and effective option for white blood cell analysis.