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Study of the effect of freezing on the visco-elastic properties of strawberries

2004Journal article Open access
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dc.contributor.authorFundo, J.
dc.contributor.authorBrandão, Teresa R. S.
dc.contributor.authorQuintas, M.
dc.contributor.authorSilva, C. L. M.
dc.date.accessioned2011-10-14T23:33:41Z
dc.date.available2011-10-14T23:33:41Z
dc.date.issued2004
dc.description.abstractThe objective of this work was to study the influence of freezing on the visco-elastic properties of strawberries. Food structure plays an important role in food quality and functionality. It is important for the consumers to find an identical sensation when they eat a fresh strawberry and when the strawberry is defrosted. The visco-elastic properties of a food product are an indirect measure of its structure. Experimental measurements of these properties may correlate to changes on the physical attributes of the product. In this work, a dynamic mechanical analyser was used to assess changes on loss (E’’) and storage (E’) modulus, applying a compressive test with a Ø1.5 cm parallel plate geometry. Strawberries were acquired in a local market and frozen in a blast and fluidized bed freezer at –30 ºC for 1 hour. Samples were stored at –30 ºC in freezing chambers. Analyses were performed on fresh strawberries, after freezing and during storage. The samples were cut in small cylinders (1.5cm x 1.5cm) and left to relax during 1 hour at room temperature. Preliminary tests were performed in order to evaluate the linear visco-elastic region and the loss and storage modulus were determined. A dynamic frequency sweep test was also performed. Results showed that the behaviour of fresh strawberry sample varies significantly when compared with a defrosted sample. The influence of the storage still cannot be evaluated and is currently under study. Overall, it can be concluded that the freezing process greatly influenced the visco-elastic properties of the strawberries.por
dc.identifier.citationFUNDO, J... [et al.] - Study of the effect of freezing on the visco-elastic properties of strawberries. In Encontro Ibérico de Reologia, IBEREO'04, Beja, Portugal, 9-11 Setembro, 2004. 6 p. - Progress in Rheology of biological and synthetic polymer systems, IBEREO'04. Beja : Instituto Politécnico de Beja, 2004. ISBN 972-99301-0-4. 6 p.por
dc.identifier.urihttp://hdl.handle.net/10400.14/6152
dc.language.isoengpor
dc.peerreviewednopor
dc.publisherGrupo Español de Reologia / Sociedade Portuguesa de Reologiapor
dc.subjectStrawberrypor
dc.subjectVisco-elastic propertiespor
dc.subjectFreezingpor
dc.titleStudy of the effect of freezing on the visco-elastic properties of strawberriespor
dc.typejournal article
dspace.entity.typePublication
person.familyNameFundo
person.familyNameBrandão
person.familyNameSilva
person.givenNameJoana F.
person.givenNameTeresa
person.givenNameCristina
person.identifier1274614
person.identifierJ-9418-2012
person.identifier1473674
person.identifier.ciencia-idA11A-7819-9522
person.identifier.ciencia-id7B19-E23B-BB31
person.identifier.ciencia-id6611-634A-132C
person.identifier.orcid0000-0002-9208-7443
person.identifier.orcid0000-0002-8857-6471
person.identifier.orcid0000-0002-0495-3955
person.identifier.ridE-9585-2015
person.identifier.ridJ-9418-2012
person.identifier.ridA-3568-2013
person.identifier.scopus-author-id24068634500
person.identifier.scopus-author-id6602174128
person.identifier.scopus-author-id7201387397
rcaap.rightsopenAccesspor
rcaap.typearticlepor
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relation.isAuthorOfPublicationebf7ead0-3772-4fd6-988c-f6b8722de84e
relation.isAuthorOfPublication4e2903de-0679-4cb1-981e-10de14c0c995
relation.isAuthorOfPublication.latestForDiscovery2f44a8e2-ade9-437d-aae3-3e894c7dc065

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