Class 4 protein clssification nutrition chemical

Nutritional & Structural classification of protein

1. Class 4
Classification based on Classification based on
Nutritional Value Nutritional Value
&&
Shape of proteinsShape of proteins

2. ProteinsProteins
Organic compoundsOrganic compounds
Contains C, H,O, N, AND P ,SContains C, H,O, N, AND P ,S
Mixed polymer of amino acidsMixed polymer of amino acids
Linked together by peptide bondsLinked together by peptide bonds
N terminal
C terminal
H
2
N
COOH
Polypeptide / Protein
n

3. Classification of ProteinsClassification of Proteins
1.1. Based on Functions Based on Functions
2.2. Based on Nutritional value Based on Nutritional value
3.3. Based on Shape & Structure Based on Shape & Structure
4.4. Based on Chemical composition Based on Chemical composition

4. Nutritional value is determined by Nutritional value is determined by
the presecence of essential amino the presecence of essential amino
acidsacids
Classification based onClassification based on
Nutritional valueNutritional value
1.Complete Proteins - 1
st
class proteins
2.2.Incomplete ProteinsIncomplete Proteins
3.3.Partially Incomplete ProteinsPartially Incomplete Proteins

5. Classification based onClassification based on
Nutritional valueNutritional value
Complete Proteins - Complete Proteins -
11
stst
class proteins class proteins
All essential amino acids All essential amino acids
present in proper present in proper
proportionproportion
Good for health and Good for health and
balanced growthbalanced growth
Egg protein, Milk Egg protein, Milk
proteins, Fish, meat, proteins, Fish, meat,
cheesecheese
Incomplete ProteinsIncomplete Proteins
Lack one or more Lack one or more
essential amino acidsessential amino acids
Can not support Can not support
expected growth and expected growth and
health completely health completely
Proteins from plants and Proteins from plants and
cereals, beans, nut , cereals, beans, nut ,
Gelatin Gelatin
Food blend is the solutionFood blend is the solution

6. Partially incomplete proteins Partially incomplete proteins
Proteins contains essential amino acids Proteins contains essential amino acids
but not enough to meet the metabolic but not enough to meet the metabolic
need of organismneed of organism
EX: Proteins from Wheat , Rice , Corn EX: Proteins from Wheat , Rice , Corn

7. Classification based on Classification based on
Physical Shape and StructurePhysical Shape and Structure
Over all shape is determined on the basis
of AXIAL RATIO
i.e. Length / Width ratio

8. Classification based onClassification based on
Physical Shape and StructurePhysical Shape and Structure
Fibrous Proteins
Length
width
Fibrous Proteins
Axial ratio more than 10
Length : width ratio is more
than 10
Molecules are elongated
Show helix, H bond, covalent
bond
Play structural role
Myosin, Actin, Keratin, Fibrin,
Collagen, Elastin, Tropomyosin

9. Classification based onClassification based on
Physical Shape and StructurePhysical Shape and Structure
Globular Proteins
Length
width
Globular Proteins
Axial ratio generally 3 or 4
Length : width ratio is less
than 10
Molecule is Spherical / Oval
Easily soluble in water ,
Digestible
Play dynamic functions
Albumin, Globulin, Protamines,
Enzymes

10. Fibrous Proteins
Play structural role
Insoluble in water ,
non -digestible
Myosin, Actin, Keratin, Fibrin,
Collagen, Elastin
Globular Proteins
Soluble in water, digestible
Play dynamic functions
Albumin, Globulin, Protamines
Classification based onClassification based on
Physical Shape and StructurePhysical Shape and Structure

11. Functions of fibrous protein Functions of fibrous protein
Mechanical functionMechanical function
Provide strength contractile character Provide strength contractile character
Provide net work for calcification of Provide net work for calcification of
bonebone

12. Functions of Globular protein Functions of Globular protein
Dynamic proteinsDynamic proteins
EnzymesEnzymes
HormonesHormones
Carrier proteins Carrier proteins
Nutritive and oncotic pressure Nutritive and oncotic pressure

13. Next class Next class
Functional classification Functional classification
of proteinof protein