Title
Abiotic and Microbiotic Factors Controlling Biofilm Formation by Thermophilic Sporeformers
Author
Zhao, Y.
Caspers, M.P.M.
Metselaar, K.I.
de Boer, P.
Roeselers, G.
Moezelaar, R.
Groot, M.N.
Montijn, R.C.
Abee, T.
Korta, R.
Publication year
2013
Abstract
One of the major concerns in the production of dairy concentrates is the risk of contamination by heat-resistant spores from thermophilic bacteria. In order to acquire more insight in the composition of microbial communities occurring in the dairy concentrate industry, a bar-coded 16S amplicon sequencing analysis was carried out on milk, final products, and fouling samples taken from dairy concentrate production lines. The analysis of these samples revealed the presence of DNA from a broad range of bacterial taxa, including a majority of mesophiles and a minority of (thermophilic) sporeforming bacteria. Enrichments of fouling samples at 55°C showed the accumulation of predominantly Brevibacillus and Bacillus, whereas enrichments at 65°C led to the accumulation of Anoxybacillus and Geobacillus species. Bacterial population analysis of biofilms grown using fouling samples as an inoculum indicated that both Anoxybacillus and Geobacillus preferentially form biofilms on surfaces at air-liquid interfaces rather than on submerged surfaces. Three of the most potent biofilm-forming strains isolated from the dairy factory industrial samples, including Geobacillus thermoglucosidans, Geobacillus stearothermophilus, and Anoxybacillus flavithermus, have been characterized in detail with respect to their growth conditions and spore resistance. Strikingly, Geobacillus thermoglucosidans, which forms the most thermostable spores of these three species, is not able to grow in dairy intermediates as a pure culture but appears to be dependent for growth on other spoilage organisms present, probably as a result of their proteolytic activity. These results underscore the importance of abiotic and microbiotic factors in niche colonization in dairy factories, where the presence of thermophilic sporeformers can affect the quality of end products. © 2013,American Society for Microbiology.
Subject
Life
MSB - Microbiology and Systems Biology
EELS - Earth, Environmental and Life Sciences
Biomedical Innovation
Biology
Healthy Living
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http://resolver.tudelft.nl/uuid:b8550362-bdc1-413b-8eba-7bf394de2406
DOI
https://doi.org/10.1128/aem.00949-13
TNO identifier
480162
ISSN
0099-2240
Source
Applied and Environmental Microbiology, 79 (18), 5652-5660
Document type
article