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Authors
Advisor(s)
Abstract(s)
A new carotenoid-rich product was formed by entrapment of Dunaliella
salina in calcium alginate beads of di†erent alginate concentrations, followed
by drying in a Ñuid-bed dryer. The drying process yielded b-carotene
recoveries of between 79 and 89% and produced a change in the 9-cis/all-trans
ratio of b-carotene isomers. The carotenoid stability of the product was dependant
on both the storage conditions and alginate content (range 3É3È7É3 g
litre~1) of the beads. In the presence of light and oxygen total carotenoid
degraded following a Ðrst order kinetic model with degradation constants
between 0É016 and 0É039 days~1, with the lowest degradation occurring with the
lowest alginate concentration. Product stored in the dark and Ñushed with nitrogen
produced Ðrst-order degradation constants of 0É012 and 0É020 days~1 for the
two higher alginate concentrations ; that with the lowest alginate content showed
no noticeable degradation after 58 days storage. During storage, the 9-cis isomer
was signiÐcantly more unstable showing a relative loss under all conditions,
degrading almost completely when stored in the presence of light and oxygen
and reaching an equilibrium ratio with the all-trans isomer when stored in the
dark and Ñushed with nitrogen.
Description
Keywords
Alginate β-carotene Cell entrapment Cis/trans-isomers Dunaliella salina Fluid-bed drying Microalgae
Citation
LEACH, Gareth; OLIVEIRA, Gisela; MORAIS, Rui - Production of a carotenoid-rich product by alginate entrapment and fluid-bed drying of Dunaliella salina. Journal of the Science of Food and Agriculture. ISSN 0022-5142. Vol. 76 (1998), p. 298-302
Publisher
Wiley