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New Findings from University of Toulouse Update Understanding of Environmental Building (A review of indoor microbial growth across building...

September 12, 2014

New Findings from University of Toulouse Update Understanding of Environmental Building (A review of indoor microbial growth across building materials and sampling and analysis methods)

By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Fresh data on Environmental Building are presented in a new report. According to news originating from Toulouse, France, by VerticalNews correspondents, research stated, "Microorganisms from damp indoor environments are known to be one of the main causes of the degradation of indoor air quality and can be serious health hazards to occupants because of the production of airborne particles. Surfaces of building materials (plasterboard, mortar, etc.) are generally highly porous and rough."

Our news journalists obtained a quote from the research from the University of Toulouse, "In damp environments, these materials can provide an environment favourable to proliferation and growth of microorganisms. Sampling of microbial communities on building materials, in addition to air sampling, is thus necessary to evaluate microbial proliferation indoors. The present paper aims to (i) summarise and compare the different methods used for sampling and analysing microbial growth on building materials and (ii) make a synthesis on the colonising microbial communities and the building materials parameters (humidity, chemical composition, pH, etc.) affecting their growth. With regards to methods, our investigations focused exclusively on studies dealing with building materials. When available, studies comparing the efficiency of methods on building materials were discussed. In-situ sampling campaigns were reviewed and the microorganisms identified on building materials were listed. Factors determining bio-receptivity of materials were also examined on the basis of studies performed on various types of materials (including building materials). The microorganisms the most frequently detected on indoor building materials are (i) fungi genera Cladosporium, Penicillium, Aspergillus and Stachybotrys, and (ii) Gram negative bacteria and mycobacteria. Some correlations between microbial genera/species and the type material can also be outlined. The water activity, the chemical composition, the pH and the physical properties of surfaces are parameters influencing microbial growth on materials. The particular behaviour of porous materials in terms of water sorption and the effect of water on microbial proliferation are underlined. In the future, the standardisation of methods for sampling, analysis and laboratory testing will be helpful in the assessment of microbial proliferation in building materials."

According to the news editors, the research concluded: "Moreover, investigations on the impact of the material's mineralogy and its surface properties on growth will be necessary for a better understanding and predicting of microbial proliferation on these substrates."

For more information on this research see: A review of indoor microbial growth across building materials and sampling and analysis methods. Building and Environment, 2014;80():136-149. Building and Environment can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier -; Building and Environment -

The news correspondents report that additional information may be obtained from T. Verdier, Univ Toulouse, UPS, LGC, Dept. of BioSyMLabMIUFR Pharm, F-31062 Toulouse 09, France. Additional authors for this research include M. Coutand, A. Bertron and C. Rogues.

Keywords for this news article include: Toulouse, France, Europe, Environmental Building

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Source: Ecology, Environment & Conservation

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