4. WHAT IS PROTEIN?
Protein is found throughout the body—in muscle, bone, skin,
hair, and every other body part or tissue. Protein is made
from twenty-plus basic building blocks called amino acids.
Because we don’t store amino acids,
Women (aged 19 to 70): 46 grams
Women (aged 70+): 57 grams
Men (aged 19 to 70): 64 grams
Men (aged 70+): 81 grams
Animal sources: meat, fish, chicken,
eggs, milk, cheese, and yoghurt.
Plant sources: legumes (including soy
protein), nuts and seeds.
5. CLASSIFICATION OF PROTEIN
Several arbitrary classifications are used for dividing protein on their shape. Most commonly,
proteins are classified into three groups,
Simple
Conjugated
Derived protein
Simpleprotein
They give only amino acids on hydrolysis.
Simple proteins are classified into several
classes such as albumin, globulin, prolamin,
glutelin, and scleroprotein.
Conjugatedprotein
Conjugated proteins contain a non-protein
group or compound containing amino acid
residues attached to a protein part.
6. DERIVED PROTEINS
Derived proteins are degradation products
obtained by the action of acids, alkalies, and
enzymes on protein. These are classified into
two types such as primary and secondary.
Primary proteins are insoluble in water but
soluble in acids and alkalis. Secondary proteins
are soluble in water and coagulated by heat.
