Title: Bioaerosol formation during grape stemming and crushing
Authors : Zollinger, Marc
Krebs, Walter
Brandl, Helmut
Published in : Science of the Total Environment
Volume(Issue) : 363
Issue : 1-3
Pages : 253
Pages to: 259
Publisher / Ed. Institution : Elsevier
Issue Date: 2006
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Aerobiologie; Umwelt-Mikrobiolologie
Subject (DDC) : 570: Biology
Abstract: Indoor formation of airborne particles during pre-fermentation grape processing was assessed by particle counting using laser particle sizers. Particle numbers of four different aerodynamic size classes (0.3 to 0.5 µm, 0.5 to 1 µm, 1 to 5 µm, and >5 µm) were determined during unloading of harvest containers and subsequent grape stemming and crushing. Regarding these size classes, composition before grape handling was determined as 87.9%, 10.4%, 1.7%, and 0.1%, respectively, whereas the composition changed during grape handling to 50.4%, 15.2%, 33.0%, and 1.5%, respectively. Airborne bacteria and fungi originating from grape processing were collected by impactor and liquid impinger samplers. Grape handling resulted in a sixfold increase in total (biological and non-biological) airborne particles. The generation of bacterial and fungal aerosols was associated mostly with particles of aerodynamic diameters >5 µm (mainly 7 to 11 µm) as determined by flow cytometry. This fraction was increased 150fold in relation to background levels before grape crushing. Maximum concentrations of culturable bacteria reached 485,000 colony forming units (cfu/m3), whereas 146,000 cfu of fungi and yeasts were detected per cubic meter of air. Culturable Gram-negative bacteria occurred only in small numbers (180 cfu/m3). In relation to the total number of airborne particles emitted, culturable microorganisms comprised 0.1% to 0.2%. As soon as grape crushing was stopped, particle concentrations decreased rapidly either due to passive settling or due to air currents in the occupational indoor environment reaching background levels.
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Chemistry and Biotechnology (ICBT)
Publication type: Article in scientific Journal
DOI : 10.1016/j.scitotenv.2005.05.025
ISSN: 1879-1026
URI: https://digitalcollection.zhaw.ch/handle/11475/14146
Appears in Collections:Publikationen Life Sciences und Facility Management

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