proteins Classification::
A. Simple proteins e.g. albumins globulins glutelins protamine albuminoids histones protamines
B. Conjugated proteins::
(1) Nuclecoproteins e.g.nuclein nucleihistone
(2) Chromoproteins e.g.haemoglobin flavoprotein cytochrome rhodopsin haemocyanin etc.
(3) Phosphoproteins e.g casein egg yolk
(4) Glycoproteins e.g.mucin mucoids
(5) Lipoproteins
(6) Metalloproteins e.g.ceruloplasmin siderophilin
C. Derived proteins e.g. peptones peptides polypeptides etc
The peptide linkages may be hydrolysed by vigorous treatment with acid or alkali There are 30 aminoacids found in plant and animal kingdom out of which 18 form part of proteins except glycine all aminoacids are optically active and have a leavo- configuration Aminoacids are present in different proportions in different proteins this is responsible for their wide variation in chemical and physical properties and also their nutritional value
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