Item – Theses Canada

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OCLC number
57207582
Link(s) to full text
LAC copy
LAC copy
Author
Allen, Brent,1977-
Title
Ozone inactivation of fungi associated with barley grain.
Degree
M.A. Sc. -- Ryerson University, 2002
Publisher
Ottawa : National Library of Canada = Bibliothèque nationale du Canada, [2004]
Description
1 microfiche.
Notes
Includes bibliographical references.
Abstract
The use of ozone as a fungicide for barley storage was studied. The effects of ozone on the inactivation of natural and inoculated fungi on barley were evaluated at different water activities and temperatures. Results indicated that higher ozone doses were better at inactivating the natural fungi on barley than lower ozone doses. An ozone dose of 0.98mg/g · min was able to reduce the natural fungi counts on the barley at 0.98aw by over 97% after 45 minutes of ozone contact time. The inactivation of the natural fungi and 'Aspergillus flavus' on the barley was favoured by higher temperatures. Ozone consumption of the barley was higher at higher temperatures. Tests on 'A. flavus' spores inoculated on barley indicated that they were resistant to ozone doses up to 4.90mg/g while ' Penicillium verrucosum' spores showed no resistance to any ozone doses that were tested. Inactivation of 'A. flavus' (vegetative state) and 'P. verrucosum' spores were favoured by higher water activities. The effect of ozone on barley germination was also examined. By 15 minutes of treatment at an ozone dose of 0.98mg/g · min, all the fungi tested were inactivated by over 90%, while germination was only reduced by 6%. Different water activities had no effect on the germination of barley. The findings show that ozone may be applied as a fumigant against fungi attacking high moisture content barley and provide the possibility of using it as an alternative to current chemicals for preserving stored barley.
ISBN
0612853101
9780612853102