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Non-thermal technologies for Alicyclobacillus acidoterrestris inactivation in apple juice

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dc.contributor.authorTremarin, A.
dc.contributor.authorBrandão, Teresa R. S.
dc.contributor.authorSilva, Cristina L. M.
dc.date.accessioned2016-04-20T19:15:39Z
dc.date.available2016-04-20T19:15:39Z
dc.date.issued2015
dc.description.abstractNon-thermal processes have been applied to food products with the purpose of eliminating spoilage and microorganisms. Ultraviolet-C (UV-C) radiation and ultrasound (US), combined or not with less severe temperature conditions, are giving promising results. In fruit juices, namely apple juices, Alicyclobacillus acidoterrestris is a concern, because it is responsible for quality degradation while being a spore-forming bacterium, able to grow at low pH (2.5–6.0) and high temperature (25–70 °C) conditions. The main objective of this work was to study the influence of UV-C radiation, ultrasounds and combinations of both treatments on A. acidoterrestris inactivation in apple juices. Ultrasounds were also tested at 60 °C (thermosonication). Commercially available juices were artificially inoculated with the bacterium, with initial loads around 107 CFU/mL. The juices were then exposed to the following treatments, for different times: (i) UV-C radiation with 13.44 W/m2 of intensity; (ii) ultrasonication (US) with frequency of 35 kHz and power level of 120-480 W; (iii) thermosonication at 60 °C and (iv) combination of UV-C and US (testing both orders of treatments). The inactivation rate was estimated by fitting a linear model to log-survival data obtained from each treatment. Results showed that ultrasounds had no significant effect on A. acidoterrestris inactivation. When UV-C radiation was applied, the number of spores decreased drastically (around 5-log reduction, which attains US Food and Drug Administration requirements) after 8 min of treatment. The combined treatment US followed by UV-C resulted in higher inactivation (around 6-log reduction) after 25 min of exposure. Inverting the order of treatments, i.e. UV-C followed by US, inactivated approximately 4-log of initial microbial load, after 30 minutes of treatment. Overall it can be concluded that UV-C radiation and combination of US with UV-C are promising treatments with a drastic impact on the loads of A. acidoterrestris in apple juices.pt_PT
dc.identifier.citationTREMARIN, A.; BRANDÃO, Teresa R.S.; SILVA, Cristina L.M. - Non-thermal technologies for Alicyclobacillus acidoterrestris inactivation in apple juice. In 2015 International Nonthermal Processing Workshop – Sustainable innovation based on science and applied research of nonthermal technologies, Athens, Greece, 12-13 November, 2015. – In TAOUKIS, Petros; STOFOROS, Nikolaos; GOGOU, Eleni (eds) - Proceedings. [Athens: National Technical University of Athens, School of Chemical Engineering, Laboratory of Food Chemistry and Technology, 2015]. p. 251-256pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.14/19860
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectUltraviolet-C radiationpt_PT
dc.subjectUltrasoundpt_PT
dc.subjectApple juicespt_PT
dc.subjectAlicyclobacillus acidoterrestrispt_PT
dc.subjectInactivationpt_PT
dc.titleNon-thermal technologies for Alicyclobacillus acidoterrestris inactivation in apple juicept_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.rightsopenAccesspt_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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