HLTB11H3 Lecture Notes - Lecture 8: Vitamin B12 Deficiency, Vitamin, Vitamin B6
Document Summary
Water soluble: vitamin b: folate, thiamin (b1), riboflavin (b2), niacin (b3), biotin, pantothenic acid, b6, b12, vitamin c. Fortification: increase the amount of a nutrient in the food supply. They are then packaged in chylomicron which enter lymph then blood. Water soluble vitamins absorbed directly to blood in small intestine: large intestine: bacteria synthesize small amount of vitamin which are absorb. Bioavailability: how much nutrient can be absorbed and used in the body. No storage, excreted in urine, depletes faster than fat soluble (exception. B12 in blood for several years: fat-soluble: Stored in liber and adipose tissue, not excreted in urine, excess amount more toxic than water soluble, take longer to develop a deficiency. Vitamin combines with chemical groups to form functional coenzyme (active vitamines). The functional coenzyme combines with incomplete enzyme to form active enzyme. The active enzyme bind to one or more molecule and accelerates the chemical reaction to form one more new molecule.