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Production of a carotenoid‐rich product by alginate entrapment and fluid‐bed drying of Dunaliella salina
Author(s) -
Leach Gareth,
Oliveira Gisela,
Morais Rui
Publication year - 1998
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/(sici)1097-0010(199802)76:2<298::aid-jsfa953>3.0.co;2-0
Subject(s) - chemistry , calcium alginate , dunaliella salina , carotenoid , nitrogen , degradation (telecommunications) , chromatography , food science , botany , organic chemistry , calcium , algae , biology , telecommunications , computer science
A new carotenoid‐rich product was formed by entrapment of Dunaliella salina in calcium alginate beads of different alginate concentrations, followed by drying in a fluid‐bed dryer. The drying process yielded β‐carotene recoveries of between 79 and 89% and produced a change in the 9‐ cis / all ‐ trans ratio of β‐carotene isomers. The carotenoid stability of the product was dependant on both the storage conditions and alginate content (range 3·3–7·3 g litre −1 ) of the beads. In the presence of light and oxygen total carotenoid degraded following a first order kinetic model with degradation constants between 0·016 and 0·039 days −1 , with the lowest degradation occurring with the lowest alginate concentration. Product stored in the dark and flushed with nitrogen produced first‐order degradation constants of 0·012 and 0·020 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 significantly 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 flushed with nitrogen. © 1998 SCI.