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Optimized production and characterization of red dye from Talaromyces purpureogenus PH7 for application as a textile dye

Summary

Scientists discovered that a natural fungus called Talaromyces purpureogenus can produce a bright red dye suitable for coloring textiles. Unlike harmful synthetic dyes that pollute water and soil, this fungal dye is biodegradable and environmentally friendly. The dyed fabrics resisted fading even after repeated washing and sunlight exposure, making it a viable alternative for the textile industry.

Background

Synthetic dyes used in textile industries are toxic, non-biodegradable, and cause significant environmental pollution affecting soil, water, and human health. Natural dyes from microorganisms present a promising eco-friendly alternative due to their stability, cost-effectiveness, and high yield independent of seasonal variations.

Objective

To optimize growth conditions and red dye production from the rhizospheric fungus Talaromyces purpureogenus PH7, and evaluate its potential application as a natural textile dye through laboratory testing on cotton fabrics.

Results

Maximum fungal growth and dye production occurred at 28°C, pH 7, and with dextrose as the carbon source. The strain tolerated chromium stress up to 800 µg/mL while salt stress significantly reduced dye production. The red dye effectively stained cotton fabrics with 0.65% absorption and demonstrated strong resistance to fading under various washing and sunlight conditions.

Conclusion

Talaromyces purpureogenus PH7 is a promising candidate for producing natural, biodegradable, durable red textile dyes in an eco-friendly manner. The fungal effluents contain beneficial metabolites with plant growth-promoting and antioxidant properties, making this approach environmentally beneficial.
  • Published in:BMC Microbiology,
  • Study Type:Experimental Laboratory Study,
  • Source: 10.1186/s12866-025-04294-9, PMID: 41039194
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