vitamin_review - Vitamins Definition Organic compound...

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Vitamins. Definition - Organic compound required in small amounts. Vitamin A Vitamin B1, B2, B3, B5, B6, B7, B9, B12 Vitamin D Vitamin E Vitamin K A few words about each.
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Sources in diet - Many plants (photoreceptors), also meat, especially liver. Fat soluble, so you can get too much, or too little if absorption is a problem. Vitamin A - Retinol Retinol (vitamin A) Some uses: Vision (11-cis-retinol bound to rhodopsin detects light in our eyes). Regulating gene transcription (retinoic acid receptors on cell nuclei are part of a system for regulating transcription of mRNAs for a number of genes).
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Vitamin B1 - Thiamine Thiamine Some uses: Cofactor for several enzymes (a precursor for thiamine pyrophosphate, one of the cofactors used by the pyruvate decarboxylase complex (PDC). Also, a cofactor for branched chain a-keto dehydrogenase. Found in a wide variety of foods, including meat, grains. Deficiency causes beriberi (muscle atrophy, neurological problems).
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Vitamin B2 - riboflavin FMN - Flavin mononucleotide FAD - flavin adenine dinucleotide. Riboflavin is a precursor for FAD and FMN. FAD is a cofactor for pyruvate decarboxylase complex (PDC), and succinate dehydrogenase in TCA cycle. FMN is an electron carrier in the electron transport chain.
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Vitamin B3 - nicotinic acid (a precursor for NAD).
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