The electrostatic attraction between charged polysaccharide and casein network provides three dimensional (gel
like, firmness) structure to the fermented milk. Casein protein and EPS interaction is the basic structural quality of gel firmness and texture of the fermented milk. In dairy industries many processing problems during fermentation process such as high syneresis, low viscosity, are now solved by increasing amount of EPS. Apart from this the typical flavor of fermented milk is due to the various carbonyl compounds, such as acetaldehyde, acetone and diacetyl are also produced by LAB. Acetaldehyde and Diacetyl is considered as the major flavor component of fermented milk