Universitat de Lleida
    • English
    • català
    • español
  • English 
    • English
    • català
    • español
  • Login
Repositori Obert UdL
View Item 
  •   Home
  • Recerca
  • Tecnologia dels Aliments
  • Articles publicats (Tecnologia dels Aliments)
  • View Item
  •   Home
  • Recerca
  • Tecnologia dels Aliments
  • Articles publicats (Tecnologia dels Aliments)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Modelling the effect of pH and water activity in the growth of Aspergillus fumigatus isolated from corn silage

Thumbnail
View/Open
Postprint (285.9Kb)
Issue date
2017
Author
Alonso, V.
Cavaglieri, L.
Ramos Girona, Antonio J.
Torres, A.
Marín Sillué, Sònia
Suggested citation
Alonso, V.; Cavaglieri, L.; Ramos Girona, Antonio J.; Torres, A.; Marín Sillué, Sònia; . (2017) . Modelling the effect of pH and water activity in the growth of Aspergillus fumigatus isolated from corn silage. Journal of Applied Microbiology, 2017, vol. 122, núm. 4, p. 1048-1056. https://doi.org/10.1111/jam.13395.
Impact


Web of Science logo    citations in Web of Science

Scopus logo    citations in Scopus

Google Scholar logo  Google Scholar
Share
Export to Mendeley
Metadata
Show full item record
Abstract
Aims: The aim of this work was to use mathematical kinetic modelling to assess the combined effects of aW, pH, O2 availability and temperature on the growth rate and time to growth of Aspergillus fumigatus strains isolated from corn silage. Methods and Results: A full factorial design was used in which two factors were assayed: pH and aW. The aW levels assayed were 0.80, 0.85, 0.90, 0.92, 0.94, 0.96, 0.98 and 0.99. The levels of pH assayed were 3.5, 4, 4.5, 5, 6, 7, 7.5 and 8. The assay was performed at normal oxygen tension at 25 and 37°C, and at reduced oxygen tension at 25°C. Two strains of A. fumigatus isolated from corn silage were used. Kinetic models were built to predict growth of the strain under the assayed conditions. The cardinal models gave a good quality fit for radial growth rate data. The results indicate that the environmental conditions which take place during silage production, while limiting the growth of most micro-organisms, would not be able to control A. fumigatus. Moreover, pH levels in silage, far from limiting its growth, are also close to its optimum. Carbon dioxide at 5% in the environment did not significantly affect its growth. Conclusions: A need for a further and controlled acidification of the silage exists, as no growth of A. fumigatus was observed at pH 3.5, as long as the organoleptic characteristics of the silage are not much compromised. Significance and Impact of the Study: Aspergillus fumigatus is one of the major opportunistic pathogens able to cause illness such as allergic bronchopulmonary aspergillosis, aspergilloma and invasive aspergillosis to rural workers. Exposure of animals to A. fumigatus spores can result in infections, particularly in those organs exposed to external invasion, such as the airways, mammary gland and uterus at birth.
URI
http://hdl.handle.net/10459.1/60245
DOI
https://doi.org/10.1111/jam.13395
Is part of
Journal of Applied Microbiology, 2017, vol. 122, núm. 4, p. 1048-1056
European research projects
Collections
  • Articles publicats (Tecnologia dels Aliments) [556]
  • Articles publicats (Agrotecnio Center) [1185]

Contact Us | Send Feedback | Legal Notice
© 2022 BiD. Universitat de Lleida
Metadata subjected to 
 

 

Browse

All of the repositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

Statistics

View Usage Statistics

D'interès

Política institucional d'accés obertDiposita les teves publicacionsDiposita dades de recercaSuport a la recerca

Contact Us | Send Feedback | Legal Notice
© 2022 BiD. Universitat de Lleida
Metadata subjected to