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Influence of air-drying temperature on the quality and bioactive characteristics of dried galega kale (Brassica Oleracea L. Var. Acephala)

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dc.contributor.authorOliveira, Sara M.
dc.contributor.authorRamos, Inês N.
dc.contributor.authorBrandão, Teresa R. S.
dc.contributor.authorSilva, Cristina L. M.
dc.date.accessioned2016-04-20T18:46:00Z
dc.date.available2016-04-20T18:46:00Z
dc.date.issued2015
dc.description.abstractDrying processes are often applied to preserve and increase the shelf life of vegetables. These products contain an extensive collection of phytochemicals known to provide health benefits. However, these compounds generally undergo significant degradation during drying because of their sensitivity to heat, light, oxygen, as well as to leaching phenomena. Thus, increased attention has been given to the concerns regarding the quality degradation of vegetables during drying. Galega kale was selected, since this leafy vegetable, often included as soups ingredient, presents high amounts of vitamins and micronutrients. The objective of this work was to evaluate the drying characteristics and the effect of drying temperature on quality characteristics of Galega kale, without any pretreatment. Drying times of 330, 162, 78 and 51 min provided minimal moisture contents, using temperatures of 35, 50, 70 and 85 ⁰C, respectively. Increasing air-drying temperatures originated significant changes in color and nutritional parameters. The L* and a* values diminished, and b* increased, originating increasing values of chroma, total colour difference and browning index, as well as decreasing values of hue angle. A pronounced effect on the retention of total phenolic compounds was observed. Regarding antioxidant capacity and vitamin C, losses of 51.7±7.5- 69.6±3.7 and 4.8±9.7-55.5±7.4% were obtained, respectively. Chlorophyll a content decreased with increasing drying temperatures, with losses between 8.9±6.7 and 35±5.6%, while degradation of chlorophyll b was negligible. In conclusion, the air-drying of Galega kale without any pretreatment resulted in considerable deterioration of its quality characteristics and nutritional value.en
dc.identifier.citationRAMOS, Inês N.; BRANDÃO, Teresa R. S.; SILVA, Cristina L. M. - Influence of air-drying temperature on the quality and bioactive characteristics of dried galega kale (Brassica Oleracea L. Var. Acephala). In 29th EFFoST Conference - Food Science Research and Innovation: Delivering Sustainable Solutions to the Global Economy and Society, Athens, Greece, 10-12 November 2015. – In DERMESONLOUOGLOU, Efimia …[et al.] (ed.) - Proceedings 29th EFFoST Conference. Athens: NTUA, School of Chemical Engineering, 2015. ISBN 978-618-82196-1-8. Vol. 2, p. 829-833pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.14/19854
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectAir-dryingpt_PT
dc.subjectKalept_PT
dc.subjectQualitypt_PT
dc.subjectNutrientspt_PT
dc.subjectBioactive compoundspt_PT
dc.titleInfluence of air-drying temperature on the quality and bioactive characteristics of dried galega kale (Brassica Oleracea L. Var. Acephala)pt_PT
dc.typeconference object
dspace.entity.typePublication
person.familyNameOliveira
person.familyNameRamos
person.familyNameBrandão
person.familyNameSilva
person.givenNameSara
person.givenNameInês
person.givenNameTeresa
person.givenNameCristina
person.identifierJ-9418-2012
person.identifier1473674
person.identifier.ciencia-id7913-12FC-8DE9
person.identifier.ciencia-id7B19-E23B-BB31
person.identifier.ciencia-id6611-634A-132C
person.identifier.orcid0000-0003-0649-2694
person.identifier.orcid0000-0002-8390-0690
person.identifier.orcid0000-0002-8857-6471
person.identifier.orcid0000-0002-0495-3955
person.identifier.ridM-5180-2013
person.identifier.ridI-9890-2017
person.identifier.ridJ-9418-2012
person.identifier.ridA-3568-2013
person.identifier.scopus-author-id16022986400
person.identifier.scopus-author-id7006766707
person.identifier.scopus-author-id6602174128
person.identifier.scopus-author-id7201387397
rcaap.rightsrestrictedAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isAuthorOfPublication6663c3d3-4fe7-4fe6-a175-8f9e1f76d978
relation.isAuthorOfPublication94376d98-c135-470b-b03f-c8839cf2e76c
relation.isAuthorOfPublicationebf7ead0-3772-4fd6-988c-f6b8722de84e
relation.isAuthorOfPublication4e2903de-0679-4cb1-981e-10de14c0c995
relation.isAuthorOfPublication.latestForDiscoveryebf7ead0-3772-4fd6-988c-f6b8722de84e

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