Vitamins
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 |