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Current Category » Bio-chemistry

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

 

Current Category » Bio-chemistry