NDLI: Large particles are responsible for elevated bacterial marker levels in school air upon occupation

Content Provider	Royal Society of Chemistry (RSC)
Author	Salzberg, Deborah Sebastian, Aleksandra Feigley, Charles Toole, Charlotte Larsson, Lennart Harley, William Fox, Alvin
Copyright Year	2005
Abstract	Muramic acid (Mur) is found in bacterial peptidoglycan (PG) whereas 3-hydroxy fatty acids (3-OH FAs) are found in Gram-negative bacterial lipopolysaccharide (LPS). Thus Mur and 3-OH FAs serve as markers to assess bacterial levels in indoor air. An initial survey, in a school, demonstrated that the levels of dust, PG and LPS (pmol m−3) were each much higher in occupied rooms than in the same rooms when unoccupied. In each instance, the Mur content of dust was increased and the hydroxy fatty acid distribution changed similarly suggesting an alteration in the bacterial population. Here, findings are compared with results from two additional schools. Follow-up aerosol monitoring by particle size was also performed for the first time for all 3 schools. The particle size distribution was shown to be quite different in occupied versus unoccupied schoolrooms. Within individual classrooms, concentrations of airborne particles ≥0.8 µm in diameter, and CO2 were correlated. This suggests that the increased levels of larger particles are responsible for elevation of bacterial markers during occupation. Release of culturable and non-culturable bacteria or bacterial aggregates from children (e.g. from flaking skin) might explain this phenomenon.
Starting Page	450
Ending Page	456
Page Count	7
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	7
Issue Number	5
Journal	Journal of Environmental Monitoring
DOI	10.1039/b418038k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Acid Peptidoglycan Gram-negative bacteria Lipopolysaccharide Fatty acid Bioaerosol Particulates Micrometre Bacteria
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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