Vitamins
Definition of Vitamins:
Vitamins are defined as organic compounds required in minute amounts for catalytic and regulatory functions in cell metabolism in absence of which certain deficiency diseases occur.
Classification of Vitamins:
1) Fat soluble Vitamin A, D, E, K
2) Water Soluble Vitamin B complex and Vitamin C
Role as Co-enzymes in Different Biochemical Reactions:
1) Oxidation Reduction
2) Transfer of Group
3) Crboxylation
4) Transamination
5) Decarboxylation
Table: Co-enzyme Derivatives of Water soluble Vitamins and their Function
Sr. No. | Vitamin | Coenzyme Derivatives | Functions Performed |
1 | Vit B1Thiamin | TPP | Aldehyde group transfer |
2 | Vit B2 Riboflavin | FMN, FAD | Hydrogen group transfer, Electron transfer in Redox Reaction |
3 | Vit B3 Pantothenic acid | CoA | Acyl group transfer |
4 | Vit B5 Niacin | NAD, NADP | Hydrogen group transfer |
5 | Vit B6 Pyridoxine | PP | Amino group transfer |
6 | Vit B7 Biotin | Biocytin | Carboxyl group transfer i.e. CO2 fixing |
7 | I Vit B9 Folic acid | THFA | One carbon group transfer |
8 | Vit. B12 Cynocobalamin | Deoxyadenosyl cobalamin | Cofactor in hydroxylations |