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Spray-drying of the microalga dunaliella salina: Effects on B-Carotene content and isomer composition

dc.contributor.authorOrset, Sandra
dc.contributor.authorLeach, Gareth C.
dc.contributor.authorMorais, Rui
dc.contributor.authorYoung, Andrew J.
dc.date.accessioned2011-10-19T21:05:43Z
dc.date.available2011-10-19T21:05:43Z
dc.date.issued1999
dc.description.abstractThe effects of spray-drying of the unicellular microalga Dunaliella salina on its B-carotene content and geometric isomer composition have been studied. The efficacy of a range of synthetic and natural antioxidants in preventing degradation of B-carotene has been determined. Losses of B-carotene and isomerization were minimal during processing for both the control (no exogenous antioxidants) and the samples containing butylated hydroxytoluene (BHT) and tert-butylhydroquinone (TBHQ). However, the use of tocopherol-based antioxidants resulted in degradation of 52-72% of B-carotene during the drying process. All dried powders of Dunaliella proved to be unstable during storage in the presence of light and air, with B-carotene degraded according to a first-order kinetic model. Of the antioxidants studied, only TBHQ was successful in significantly minimizing degradation (degradation constants of 0.03 and 0.04 days-1, compared to 0.53 days-1 for the respective control). For control powders and those with BHT added to the feed, the degradation constants were reduced to values between 0.27 and 0.37 days-1 by restricting light and flushing with nitrogen; however, storage in the dark alone had no effect. For more slowly degrading powders having TBHQ added to the feed, it was clear that degradation of â-carotene was influenced by both light and oxygen. During storage the 9-cis isomer of B-carotene was significantly more unstable than the all-trans form. TBHQ was, however, successful in reducing relative losses of this isomer for samples stored in the dark. The results suggest a dominant photodegradative mechanism for the loss of the 9-cis isomer of B-carotene.por
dc.identifier.citationORSET, Sandra... [et al.] - Spray-Drying of the Microalga Dunaliella salina: Effects on B-Carotene Content and Isomer Composition. Journal of Agricultural and Food Chemistry. ISSN 0021-8561. Vol. 47, n.º 11 (1999), p. 4782-4790por
dc.identifier.urihttp://hdl.handle.net/10400.14/6480
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherAmerican Chemical Societypor
dc.subjectAntioxidantspor
dc.subjectB-carotenepor
dc.subjectDunaliella salinapor
dc.subjectSpray-dryingpor
dc.titleSpray-drying of the microalga dunaliella salina: Effects on B-Carotene content and isomer compositionpor
dc.typejournal article
dspace.entity.typePublication
person.familyNameMorais
person.givenNameRui M. S. C.
person.identifier143926
person.identifier.ciencia-id541B-04AE-0686
person.identifier.orcid0000-0001-5138-6941
person.identifier.ridM-5065-2013
person.identifier.scopus-author-id7005146997
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationfa2b729c-8159-4a98-9bfe-0fa1e98aa9fb
relation.isAuthorOfPublication.latestForDiscoveryfa2b729c-8159-4a98-9bfe-0fa1e98aa9fb

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