| beta-cyclohexenyl carotenoid epoxidase | <enzyme> Isolated from the pepper capsicum annuum; genbank x91491 Registry number: EC 1.14.14.- Synonym: beta-chc epoxidase (26 Jun 1999) |
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| carotenoid | <biochemistry> Accessory lipophilic photosynthetic pigments in plants and bacteria, including carotenes and xanthophylls, red, orange or yellow, with broad absorption peaks at 450-480nm. Act as secondary light harvesting pigments, passing energy to chlorophyll and as protective agents, preventing photoxidation of chlorophyll. Found in chloroplasts and also in plastids in some nonphotosynthetic tissues, for example carrot root. (18 Nov 1997) |
| provitamin | A chemical that becomes a vitaminvia a natural reaction within anorganism, such as when 7-dehydrocholesterol in the skin becomes vitamin Dwhen its exposed to sunlight. (09 Oct 1997) |
| provitamin A | Trivial name for carotenoids exhibiting qualitatively the biological activity of beta-carotene, i.e., vitamin A precursors (alpha-, beta-, and gamma-carotene and cryptoxanthin); contained in fish liver oils, spinach, carrots, egg yolk, milk products, and other green leaf or yellow vegetables and fruits. (05 Mar 2000) |
| provitamin D2 | Any substance that can give rise to ergocalciferol (vitamin D2); e.g., ergosterol. (05 Mar 2000) |
| provitamin D3 | Cholesta-5,7-dien-3b-ol;a zoosterol in skin and other animal tissues that upon activation by ultraviolet light becomes antirachitic and is then referred to as cholecalciferol (vitamin D3). Synonym: provitamin D3. (05 Mar 2000) |