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Inactivation of Alicyclobacillu acidoterrestris in apple juice under ultraviolet irradiation treatments

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dc.contributor.authorTremanin, Andreia
dc.contributor.authorBrandão, Teresa R. S.
dc.contributor.authorSilva, Cristina L. M.
dc.date.accessioned2016-04-20T15:13:12Z
dc.date.available2016-04-20T15:13:12Z
dc.date.issued2015
dc.description.abstractHeat processing is the most commonly used treatment for microbial inactivation. However, temperature may have adverse effects on sensory and nutritional attributes of foods. Non-thermal technologies have received increasing attention for preservation of beverages, due to their potential for inactivating spoilage and pathogenic microorganisms. In addition, they can help minimizing quality losses, namely flavour, colour and nutritional value. Ultraviolet-C radiation (UV-C) is widely used as an alternative strategy to control microorganism in food products. Alicyclobacillus acidoterrestris is a thermo-acidophilic, non-pathogenic and spore-forming bacterium, able to grow at low pH (3.0–3.5) and high temperatures (50–70 °C). It has been considered a new type of spoilage bacterium, with important potential spoilage concern for hot-fill fruit and fruit juices. The main objective of this work was to study the influence of UV-C radiation treatments with seven different intensities (0.32, 0.86, 2.59, 5.59, 8.45, 11.50 and 13.44 W/m2) on A. acidoterrestris inactivation in apple juices. Commercial juices were artificially inoculated with bacterium, with initial loads around 107 CFU/mL. They were then exposed to UV-C radiation and the treatment impact on microbial loads was assessed throughout exposure times. Results showed that the log-survival of A. acidoterrestris decreased linearly with treatment time, for all intensities tested. A decimal reduction time at a given UV-C intensity was estimated by fitting a first order kinetic model to experimental data. When the most severe intensity was used (i.e., 13.44 W/m2), the number of spores decreased drastically (around 5-log reduction, which attains US Food and Drug Administration requirements) after 8 min of treatment. For the remaining UV-C intensities, this inactivation was achieved for higher exposure times. Overall it can be concluded that UV-C radiation is a promising treatment with a drastic impact on the loads of A. acidoterrestris in apple juices, especially when high intensities are used.pt_PT
dc.identifier.citationTREMANIN, Andreia ; BRANDÃO, Teresa R. S. ; SILVA, Cristina L. M. - Inactivation of Alicyclobacillu acidoterrestris in apple juice under ultraviolet irradiation treatments. In 29th EFFoST Conference - Food Science Research and Innovation: Delivering Sustainable Solutions to the Global Economy and Society, Athens, Greece, 10-12 November 2015. DERMESONLOUOGLOU, Efimia …[et al.] (ed.) - Proceedings 29th EFFoST Conference. Athens: NTUA, School of Chemical Engineering, 2015. ISBN 978-618-82196-1-8. Vol. 1, p. 159-163pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.14/19819
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectUltraviolet-C radiationpt_PT
dc.subjectApple juicespt_PT
dc.subjectAlicyclobacillus acidoterrestrispt_PT
dc.subjectInactivationpt_PT
dc.titleInactivation of Alicyclobacillu acidoterrestris in apple juice under ultraviolet irradiation treatmentspt_PT
dc.typeconference object
dspace.entity.typePublication
person.familyNameBrandão
person.familyNameSilva
person.givenNameTeresa
person.givenNameCristina
person.identifierJ-9418-2012
person.identifier1473674
person.identifier.ciencia-id7B19-E23B-BB31
person.identifier.ciencia-id6611-634A-132C
person.identifier.orcid0000-0002-8857-6471
person.identifier.orcid0000-0002-0495-3955
person.identifier.ridJ-9418-2012
person.identifier.ridA-3568-2013
person.identifier.scopus-author-id6602174128
person.identifier.scopus-author-id7201387397
rcaap.rightsrestrictedAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isAuthorOfPublicationebf7ead0-3772-4fd6-988c-f6b8722de84e
relation.isAuthorOfPublication4e2903de-0679-4cb1-981e-10de14c0c995
relation.isAuthorOfPublication.latestForDiscovery4e2903de-0679-4cb1-981e-10de14c0c995

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