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Certification procedures for sirius red F3B (CI 35780, Direct red 80).

R W Dapson¹, C Fagan, J A Kiernan

¹Biological Stain Commission, Pathology Department, Box 626, University of Rochester Medical Center, Rochester, New York, USA.

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission

|March 23, 2011

Summary

Sirius red F3B dye is certified for collagen and amyloid staining based on its unique spectral properties and performance in histological methods. Its dye content is not assessed as it does not impact staining efficacy.

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Area of Science:

Histology and Staining Techniques
Biochemical Analysis
Dye Chemistry

Background:

Sirius red F3B (Direct red 80) is a polyazo dye crucial for histological staining.
It is widely used for visualizing collagen and amyloid deposits in tissues.
Certification requires adherence to specific spectrophotometric and performance standards.

Purpose of the Study:

To outline the certification criteria for Sirius red F3B dye.
To define the required spectral characteristics and performance benchmarks for dye certification.
To establish quality control measures for Sirius red F3B used in biological staining.

Main Methods:

Spectrophotometric analysis to determine characteristic absorption peaks (λmax at 528-529 nm, shoulder near 500 nm, peaks at 372, 281-282, 230-235 nm).
Spot tests involving concentrated sulfuric acid (H2SO4) and hydrochloric acid (HCl) to assess colorimetric reactions.
Histological staining evaluation using the picro-sirius red method for collagen and Llewellyn's alkaline sirius red method for amyloid.

Main Results:

Certified Sirius red F3B must display a specific absorption spectrum.
Satisfactory performance in picro-sirius red staining yields red collagen with birefringent fibers (yellow/green).
Successful application in Llewellyn's method results in red-colored amyloid with green birefringence.

Conclusions:

Certification of Sirius red F3B relies on defined spectral properties and validated staining performance.
The dye's content is not a critical factor for its efficacy in collagen and amyloid staining.
These criteria ensure the reliability and accuracy of Sirius red F3B in diagnostic and research histology.