生物化學(xué)原理課件（英文）：Chapter14 Vitamins and coenzymes

1、 Outline Water-soluble vitamins 1. Vitamin B family 2. Vitamin C Fat-soluble vitamins 1. Vitamin A 2. Vitamin D 3. Vitamin E 4. Vitamin K Vita : life Amine : containing N (1st vitamins contained nitrogen) Vitamins are organic, essential nutrients reqd in minute amounts to perform specific functions

2、that promote growth, reproduction, or the maintenance of health bone abnormalities are the most obvious sign LRickets vitamin D deficiency disease of children characterized by abnormal bone growth bowed legs or knock knees, outward bowed chest and knobs on the ribs LOsteomalacia Vitamin D Deficiency

3、 Fortified milk Fortified margarine Some found in animal foods butter cream egg yolks liver fatty fish such as salmon Food Sources of Vitamin D Tocopherol Greek word used for vitamin E tokos means offspring 4 different tocopherols alpha, beta, gamma, delta Vitamin E Antioxidant protects fats and fat

4、-soluble substances from oxidation protects cell membranes from oxidative damage protects red blood cells which carry oxygen from lungs to body tissues Role of Vitamin E LSymptoms produced in lab rats BUT not in humans because vitamin E: is widespread in food is stored in ample amounts in fatty tiss

5、ues is recycled by cells LCan occur in premature babies LNeuromuscular Disorder in adults loss of muscle coordination & reflexes impaired vision & speech LDeficiency more likely with poor absorption of fat or very low fat intake Vitamin E Deficiency Vegetable oil products cooking oil margarine salad

6、 dressing shortening Fruits and vegetables Wheat germ Food Sources Necessary for synthesis of four proteins involved in blood clotting proteins needed for bone formation and in binding minerals in bone Vitamin K LDeficiency is rare LMay occur in newborn infants who have no bacteria in intestinal tract yet in people who have taken antibiotics that have destroyed their normal intestinal bacteria Vitamin K Deficiency Non-Food Source Gut bacteria produce vitamin K Food Sources dark-green leafy