NUTR 3330 Lecture Notes - Lecture 1: Storage Protein, Edma, Pyruvate Dehydrogenase
18 Sep 2017
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Document Summary
Vitamins discovery: study of certain substances that prevent deficiency diseases, study of accessory factors that are needed for survival of animals fed purified diets, term coined by casimir funk in 1912, substances essential for health. Vitamins what are they: b vitamins (8) Pro-vitamin a, carotenoid, orange/yellow colour, non-toxic (supplements) Easily taken up and released by body tissues. Excess amounts excreted in urine: fat soluble. Enter blood via lymph system; need transport proteins. Can be stored (liver & body fat); daily supplies not as important. More concern about excess intakes trapped within body. Vitamins are organic: contain carbon and can be easily destroyed, prolonged heating destroys thiamin, uv light destroys riboflavin, oxygen destroys vitamin c. Metabolic functions: vitamin a only vitamin involved in vision others performed by many vitamins, anti-oxidant capacity is done by vitamin e, c, and beta carotene, knowledge of normal function gives understanding of deficiency (vitamin k, blood clotting) Co-enzymes (catalyzing reactions: b vitamins, vitamin a, k, c.
