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

Summary

Researchers optimized conditions to produce natural red dye from a fungus called Talaromyces purpureogenus, which could replace harmful synthetic dyes in the textile industry. The dye successfully colored cotton fabrics and resisted fading from washing and sunlight exposure. The fungus also produces beneficial compounds that could improve soil health, making this an environmentally friendly alternative to petroleum-based chemical dyes.

Background

Synthetic dyes used in textile and other industries cause significant environmental pollution and health hazards. Natural dyes from microbial sources offer a sustainable alternative. This study focuses on optimizing red dye production from a rhizospheric fungus for textile applications.

Objective

To optimize growth conditions and red dye production of Talaromyces purpureogenus PH7, characterize the produced dye, and evaluate its efficacy as a natural textile dye through staining tests on cotton fabrics.

Results

Maximum fungal growth and dye production occurred at 28°C, pH 7, with dextrose as carbon source. The strain tolerated chromium up to 800 µg/g but was inhibited by high salt concentrations. Dyed fabrics showed 0.65% dye absorption with no fading under experimental treatments. The culture produced beneficial metabolites including IAA, flavonoids, phenolics, and exhibited strong antioxidant activity.

Conclusion

Talaromyces purpureogenus PH7 is a promising candidate for producing natural, biodegradable, durable red textile dyes in an eco-friendly manner with minimal environmental impact and additional plant growth-promoting benefits.
  • Published in:BMC Microbiology,
  • Study Type:Experimental Study,
  • Source: PMID: 41039194, DOI: 10.1186/s12866-025-04294-9
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