CHEMISTRY OF GELATIN AND PEPTONE

 

CHEMISTRY OF GELATIN AND PEPTONE

 

                Gelatin and peptone are derived proteins. Gelatin is a rich source of glyoine, but contains only traces of tyrosine and lacks tryptophan, cystine and cystieine. Gelatin is a derived protein obtained from collagen present in bones and white fibrous tissues. It has a poor biological value, it is not heat coagulable and is precipitated by half saturation with ammonium sulphate.

 

                Peptones are the hydrolytic products of proteoses. They are not heat coagulable, cannot be precipitated either by half saturation or by full saturation with ammonium sulphate. If any precipitate is formed it shows the contamination of primary or secondary proteoses.

 

                Perform that following test separately with gelatin and peptone and draw the proper inference.

 

1)       Half Saturation test:

2)       Full Saturation test:

3)       Heat Coagulation test:

4)       Colour reactions of protein: