AN SC260 Lecture Notes - Lecture 7: Vitamin, Vitamin B6, Retinol

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Vitamin: organic compound, tiny amounts, essential for metabolic reactions. Cofactor: non-protein, bind to enzyme to activate them. Cannot be synthesized in sufficient quantities or under certain conditions. Gets stored into the fat (liver structure and adipose tissues) Takes times for vitamin deficiencies to occur because they are in the fat. Animals in northern hemisphere store vitamin d in fat and can last all winter using its fat stores to synthesize vitamin d. Polar bears have extremely high vitamin a stores in liver (but they don"t die because they are tolerant to those levels) Beta-carotene is the form found in most plants. Retinol is not found naturally in plant-based feeds. Not all carotenoids can be converted into vitamin a. Also link between vitamin d and muscle growth. The vitamin d that you consume is not the active form. Allows us to compare based on how much of vitamin a can be used.

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