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The role of fungal metabolic by-prod...

De Jesus Miranda, Victor Raul.

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The role of fungal metabolic by-products in indoor air chemistry: Analytical considerations for the evaluation of poor indoor environments.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The role of fungal metabolic by-products in indoor air chemistry: Analytical considerations for the evaluation of poor indoor environments./
Author:	De Jesus Miranda, Victor Raul.
Description:	204 p.
Notes:	Director: Richard F. Browner.
Contained By:	Dissertation Abstracts International62-06B.
Subject:	Chemistry, Analytical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3015647
ISBN:	9780493264776

The role of fungal metabolic by-products in indoor air chemistry: Analytical considerations for the evaluation of poor indoor environments.
De Jesus Miranda, Victor Raul.

The role of fungal metabolic by-products in indoor air chemistry: Analytical considerations for the evaluation of poor indoor environments. - 204 p.

Director: Richard F. Browner.

Thesis (Ph.D.)--Georgia Institute of Technology, 2001.

Fungal volatile metabolic by-product emissions from inoculated building materials such as wallboard, ceiling tiles, and fiberglass furnace filters, were investigated in this project to examine their role in indoor air chemistry. This was done in an attempt to establish a fungal microbial volatile organic compound (MVOC) signature to aid in the evaluation of poor indoor environments where fungal contamination is suspected. Furthermore, this project examined the effects of environmental stresses such as the presence of ozone and other volatile organic compounds (VOCs) on fungal volatile metabolite emissions. In addition, the analytical validity of monitoring fungal MVOC emission patterns as a measure of biocidal activity was also tested, thus this approach may be used to evaluate the "as used" effectiveness of various biocides. Experimental results suggest that fungal MVOC emissions may play a larger role in indoor air chemistry than previously acknowledged. The identification of a fungal MVOC signature was not possible at this time, due in part to the similarities between the responses from the tested fungi, Aspergillus niger and Penicillium viridicatum (p < 0.001). Fungal exposure to VOCs commonly encountered in indoor settings influenced the fungi's volatile metabolite emissions by either enhancing or inhibiting MVOC emissions, with recorded MVOC levels over 100 mg/m 3, with VOCs such as 2-ethyl-1-hexanol and limonene contributing the largest observed MVOC levels. However, biomass determination procedures are needed to validate the observed phenomena. The introduction of low-level (40--200 ppb) ozone concentrations in the experimental chambers was shown to possibly exacerbate fungal contamination problems. Recorded MVOC levels after ozone exposure were lower than control samples (peak MVOC concentration over 200 mug/m 3); carboxyl metabolites were the predominant species identified after ozone exposure. Additionally, fungal MVOC levels were shown to be a feasible biocide-treatment-efficacy indicator, as evidenced by lower MVOC levels after inoculation of treated building material samples (compared to control samples). Overall, this work has led to a better understanding of MVOC emissions by indoor fungal species grown on building materials. In addition, a clearer indication of the most appropriate methods applicable to IAQ investigations where microbial contamination is suspected has also been established.

ISBN: 9780493264776Subjects--Topical Terms:

586156
Chemistry, Analytical.

The role of fungal metabolic by-products in indoor air chemistry: Analytical considerations for the evaluation of poor indoor environments.
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520 $a Fungal volatile metabolic by-product emissions from inoculated building materials such as wallboard, ceiling tiles, and fiberglass furnace filters, were investigated in this project to examine their role in indoor air chemistry. This was done in an attempt to establish a fungal microbial volatile organic compound (MVOC) signature to aid in the evaluation of poor indoor environments where fungal contamination is suspected. Furthermore, this project examined the effects of environmental stresses such as the presence of ozone and other volatile organic compounds (VOCs) on fungal volatile metabolite emissions. In addition, the analytical validity of monitoring fungal MVOC emission patterns as a measure of biocidal activity was also tested, thus this approach may be used to evaluate the "as used" effectiveness of various biocides. Experimental results suggest that fungal MVOC emissions may play a larger role in indoor air chemistry than previously acknowledged. The identification of a fungal MVOC signature was not possible at this time, due in part to the similarities between the responses from the tested fungi, Aspergillus niger and Penicillium viridicatum (p < 0.001). Fungal exposure to VOCs commonly encountered in indoor settings influenced the fungi's volatile metabolite emissions by either enhancing or inhibiting MVOC emissions, with recorded MVOC levels over 100 mg/m 3, with VOCs such as 2-ethyl-1-hexanol and limonene contributing the largest observed MVOC levels. However, biomass determination procedures are needed to validate the observed phenomena. The introduction of low-level (40--200 ppb) ozone concentrations in the experimental chambers was shown to possibly exacerbate fungal contamination problems. Recorded MVOC levels after ozone exposure were lower than control samples (peak MVOC concentration over 200 mug/m 3); carboxyl metabolites were the predominant species identified after ozone exposure. Additionally, fungal MVOC levels were shown to be a feasible biocide-treatment-efficacy indicator, as evidenced by lower MVOC levels after inoculation of treated building material samples (compared to control samples). Overall, this work has led to a better understanding of MVOC emissions by indoor fungal species grown on building materials. In addition, a clearer indication of the most appropriate methods applicable to IAQ investigations where microbial contamination is suspected has also been established.
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