Ergocalciferol

Year Source Cod-hver oil, /L Ergocalciferol (crystalline vitamin D2), /g Cholecalciferol D /g... 

EPOXY ETHYLOXY PROPANE ERADICATORS, PAINT OR GREASE ERGOCALCIFEROL... 

Fat-Soluble Retinol (vitamin A) Ergocalciferol (vitamin Dg) Cholecalciferol (vitamin Dg) n-Tocopherol (vitamin E) Vitamin K ... 

Figure 10.9 Cliromatogi ams of foitified coconut oil obtained by using (a) normal-phase HPLC and (b) GPC/noimal-phase HPLC. Peak identification is as follows 1 (a,b), DL-a-toco-pheryl acetate, 2 (b), 2,6-di-tert-butyl-4-methylphenol 2 (a) and 3 (b), retinyl acetate 3 (a) and 4 (b), tocol 4 (a) and 5 (b), ergocalciferol. Reprinted from Analytical Chemistry, 60, J. M. Brown-Thomas et al., Determination of fat-soluble vitamins in oil matrices by multidimensional liigh-peiformance liquid cliromatography , pp. 1929-1933, copyright 1988, with permission from the American Chemical Society.

C28H,40 21307-05-1) see Ergocalciferol (3p)-pregna-5,16,20-triene-3,20-diol 20-acetate 3-formate (C24H22O4 62490-12-4) see Desoxycortone acetate pregnenolone... 

CF patients with low bone mineral density and low serum vitamin D levels may improve bone health through supplemental vitamin D analogs beyond those found in standard CF vitamins. The optimal dose and analog have not been determined. For ergocalciferol, a minimum of 400 IU and 800 IU... 

Vitamin D is often combined in varying amounts with calcium salts. A multiple vitamin is another good source of vitamin D. Most multivitamins contain 400 IU per tablet. Vitamin D is also available as a single entity. Doses above 2000 IU/day should be avoided owing to the risk of hypercalciuria and hypercalcemia. Ergocalciferol (vitamin D2) and... 

D2 (ergocalciferol) Forvitamin D deficiency, 50,000 units once weekly or l,25(OH)2 vitamin D, other... 

Halket and Lisboa (25) examined several Vitamin D derivatives by capillary gas chromatography coupled with mass spectrometry. This technique offered the advantages of great sensitivity and separating power. Retention times and fragmentation patterns for ergocalciferol, cholecalciferol and calcitriol were reported. 

Erectile dysfunction, therapeutics for, 5 182-183t Ergocalciferol, 25 791 Ergonovine, 2 93-94 Ergosterol, 25 791 Ergotamine, 2 93-94 Ergotism, alkaloid role in, 2 75 Ergun equation, 11 332-333, 767 Erionite, 3 289... 

Determination of vitamin D by HPLC - Measurement of cholecalciferol (D3) and ergocalciferol (D2)... 

Ergocalciferol Dissolve 0.2 g rapidly without heating, in aldehyde-free ethanol (96%) to produce 25 ml + 103° to + 107°... 

The active vitamins are produced by conversion of provitamins by ultraviolet light. Ergosterol, a yeast sterol, is converted to its active form, ergocalciferol (vitamin D2), and 7-dehydrocholesterol, which is found in many natural foods and is also synthesized in man, is converted to cholecalciferol (vitamin D3). Fish liver oils are virtually the only source of vitamin D3 in nature. The most active form of vitamin D3 is 1,25-dihydroxycholecalciferol and this is produced by the hydroxylation of cholecalciferol at position 25 in the liver and then at position 1 in the kidney. 

The two hydroxylase enzymes can also utilize the plant-derived steroid, ergocalci-ferol, (vitamin D2) as a substrate. The final product is biologically active and so food manufacturers often fortify their products with ergocalciferol to prevent the occurrence of vitamin D deficiency and consequent rickets in childhood or osteomalacia in adults. 

Vitamin D is commonly found in two forms, both derivatives of steroids. These are known as cholecalciferol (vitamin D3) and ergocalciferol (vitamin D2). Cholecalciferol is formed directly from the steroid known as 7-dehydrocholesterol by the action of sunlight, or other source of ultraviolet (UV) light, in the skin of humans and other animals. When parents encourage their children to go out and play in the sun, there is good reason for doing so (but avoid sunburn). ... 

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