Publication
Spray-drying of the microalga dunaliella salina: Effects on B-Carotene content and isomer composition
| dc.contributor.author | Orset, Sandra | |
| dc.contributor.author | Leach, Gareth C. | |
| dc.contributor.author | Morais, Rui | |
| dc.contributor.author | Young, Andrew J. | |
| dc.date.accessioned | 2011-10-19T21:05:43Z | |
| dc.date.available | 2011-10-19T21:05:43Z | |
| dc.date.issued | 1999 | |
| dc.description.abstract | The 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.citation | ORSET, 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. 4782-4790 | por |
| dc.identifier.uri | http://hdl.handle.net/10400.14/6480 | |
| dc.language.iso | eng | por |
| dc.peerreviewed | yes | por |
| dc.publisher | American Chemical Society | por |
| dc.subject | Antioxidants | por |
| dc.subject | B-carotene | por |
| dc.subject | Dunaliella salina | por |
| dc.subject | Spray-drying | por |
| dc.title | Spray-drying of the microalga dunaliella salina: Effects on B-Carotene content and isomer composition | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| person.familyName | Morais | |
| person.givenName | Rui M. S. C. | |
| person.identifier | 143926 | |
| person.identifier.ciencia-id | 541B-04AE-0686 | |
| person.identifier.orcid | 0000-0001-5138-6941 | |
| person.identifier.rid | M-5065-2013 | |
| person.identifier.scopus-author-id | 7005146997 | |
| rcaap.rights | restrictedAccess | por |
| rcaap.type | article | por |
| relation.isAuthorOfPublication | fa2b729c-8159-4a98-9bfe-0fa1e98aa9fb | |
| relation.isAuthorOfPublication.latestForDiscovery | fa2b729c-8159-4a98-9bfe-0fa1e98aa9fb |