Growth of indoor fungi on gypsum

F.J.J. Segers, K.A. van Laarhoven, H.A.B. Wösten, J. Dijksterhuis

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
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Abstract

Aims: To have a better understanding of fungal growth on gypsum building materials to prevent indoor fungal growth. Methods and Results: Gypsum is acquired by mining or as a by-product of flue-gas desulphurization or treatment of phosphate ore for the production of fertilizer. Natural gypsum, flue-gas gypsum and phosphogypsum therefore have different mineral compositions. Here, growth of fungi on these types of gypsum was assessed. Conidia of the indoor fungi Aspergillus niger, Cladosporium halotolerans and Penicillium rubens were inoculated and observed using microscopic techniques including low-temperature scanning electron microscopy. Elemental analysis of gypsum was done using inductively coupled plasma atomic emission spectroscopy and segmented flow analysis. Moisture content of the gypsum was determined using a dynamic vapour sorption apparatus. Aspergillus niger, C. halotolerans and P. rubens hardly germinated on natural gypsum and flue-gas gypsum. The latter two fungi did show germination, outgrowth, and conidiation on phosphogypsum, while A. niger hardly germinated on this substrate. Other experiments show that C. halotolerans and P. rubens can develop in pure water, but A. niger does not. Conclusions: The observations show that the lack of germination of three indoor fungi is explained by the low amount of phosphor in natural, flue-gas and laboratory-grade gypsum. Additionally, C. halotolerans and P. rubens can develop in pure water, while conidia of A. niger do not show any germination, which is explained by the need for organic molecules of this species to induce germination. Significance and Impact of the Study: Indoor fungal growth is a potential threat to human health and causes damage to building materials. This study possibly helps in the application of the right type of gypsum in buildings.

Original languageEnglish
Pages (from-to)429-435
Number of pages7
JournalJournal of Applied Microbiology
Volume123
Issue number2
DOIs
Publication statusPublished - 1 Aug 2017

Keywords

  • Cladosporium
  • fungal biodegradation
  • gypsum
  • indoor fungi
  • Penicillium
  • spores
  • Microscopy, Electron, Scanning
  • Calcium Sulfate/analysis
  • Phosphorus/analysis
  • Air Pollution, Indoor/analysis
  • Construction Materials/microbiology
  • Fungi/classification
  • Spores, Fungal/genetics

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