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[Benzidine dyes and risk of bladder cancer].

M Miyakawa¹, O Yoshida

¹Department of Urology, Shimada Municipal Hospital.

Hinyokika Kiyo. Acta Urologica Japonica

|December 1, 1989

Summary

Benzidine-based azo dyes can break down into benzidine, a known carcinogen. This poses a risk for workers exposed to these dyes, particularly in industries like textile manufacturing.

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Area of Science:

Toxicology
Organic Chemistry
Environmental Microbiology

Context:

Benzidine-based dyes were widely used until the 1970s with little concern for their chemical structure or finished product safety.
Occupational exposure to azo dyes is a concern, particularly for workers involved in hand-painting Yuzen-type silk kimonos.
The metabolic breakdown of benzidine-based dyes and their potential health risks have been investigated.

Purpose:

To investigate the potential risk of bladder tumors in workers exposed to benzidine-based azo dyes.
To determine if azo dyes disintegrate into benzidine under relevant conditions.
To review the literature on potentially mutagenic or carcinogenic dyes.

Summary:

Benzidine-based dyes are metabolized to benzidine in rats and mice.
The azo linkage in benzidine dyes can be reduced by Escherichia coli and soil bacteria.
Many industrial and consumer dyes, including hair dyes and pharmaceutical colorants, are potentially mutagenic or carcinogenic.

Impact:

Highlights the carcinogenic potential of benzidine-based dyes and their breakdown products.
Informs occupational safety measures for workers handling these dyes.
Contributes to the understanding of dye metabolism and environmental microbial activity.

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