Abstract
1. 1. Dietary radioactive [ 14C]β-carotene is converted by Artemia salina into echinenone and canthaxanthin with virtually no loss of specific activity. 2. 2. Isozeaxanthin is absorbed by Artemia but is not metabolized to canthaxanthin. 3. 3. Isocryptoxanthin is converted into 4-hydroxy-4′-keto-β-carotene but not into either echinenone or canthaxanthin. 4. 4. A mechanism for canthaxanthin biosynthesis is discussed in the light of studies on Artemia and other invertebrates.
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