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Assessing mold growth severity on various textiles: comparative analysis of inoculum densities and fungal strains
Ann Hammad1, Kendall Beaugrand1, Joseph A Ross1
1Microbiology Department, Chinook Contract Research Inc., Airdrie AB T4A 0C3, Canada.
Abstract:
Mold growth on textiles during overseas shipping poses significant economic and health risks, necessitating a comprehensive understanding of fungal contamination dynamics. This study evaluated textile susceptibility to fungal contamination during transit by examining growth patterns, onset times, and determining minimum fungal densities for visible mold growth. Inoculations of six fungal strains (individual and pooled) were conducted at inoculum densities ranging from 102 to 106 spores/ml on various textile materials. The study comprised two phases: pilot growth (PG, with glucose) and Simulated Shipping Conditions (SSC, without glucose). PG yielded mycelial mats on textiles for all fungal strains except Penicillium citrinum and Stachybotrys chartarum. SSC exhibited variable susceptibilities, with cotton and suede highly susceptible and polyester, imitation suede, and polyurethane notably resistant to mycelial growth. Minimum fungal densities for visible mold growth were established for each textile based on SSC. The findings reveal distinct fungal susceptibilities among textiles, influenced by material composition and structure. Consistent growth on certain textiles at lower fungal densities highlights the need for targeted preventive measures. This research provides crucial insights for the manufacturing and shipping industries, guiding the development of effective mold prevention strategies and establishment of contamination limits during overseas transport.
Insights
Textile mold during shipping is a major risk. This study found cotton and suede are highly susceptible to fungal growth, while polyester and polyurethane are resistant, informing new prevention strategies.
Area of Science:
- Textile Science
- Mycology
- Industrial Microbiology
Background:
- Fungal contamination of textiles during international shipping presents significant economic and health concerns.
- Understanding fungal contamination dynamics is crucial for developing effective prevention strategies.
Purpose of the Study:
- To evaluate textile susceptibility to fungal contamination during simulated shipping.
- To determine the onset times and minimum fungal densities for visible mold growth on various textiles.
- To identify specific textile materials vulnerable to fungal proliferation during transit.
Main Methods:
- Inoculation of six fungal strains at densities from 10^2 to 10^6 spores/ml on diverse textile types.
- Two experimental phases: pilot growth (PG) with glucose and Simulated Shipping Conditions (SSC) without glucose.
- Assessment of mycelial growth, onset times, and minimum fungal densities for visible mold.
Main Results:
- Pilot growth showed mycelial mats on most textiles, except for Penicillium citrinum and Stachybotrys chartarum.
- Simulated Shipping Conditions revealed variable susceptibility: cotton and suede were highly susceptible.
- Polyester, imitation suede, and polyurethane demonstrated significant resistance to mycelial growth.
- Minimum fungal densities for visible mold were established for each textile type under SSC.
Conclusions:
- Textile susceptibility to fungal growth varies significantly based on material composition and structure.
- Certain textiles support fungal growth even at lower inoculum densities, necessitating targeted preventive measures.
- Findings provide critical data for the textile manufacturing and shipping industries to mitigate mold risks and establish contamination limits.
