Download MBBS Nutritional Indices of Protein Lecture PPT

Nutritional indices of protein
> Whipple introduce plasmapheresis are as means to assess the
nutritional value of protein.

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>Modern way to assess the nutritional value of protein as the only
source of nitrogen to an animal and assess the weight gain .

Following Indicates are used to assess the nutritional value of
protein.

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1:-Bilogical value of protein
2:-Net protein utilization
3:-Net dietery protein
4:-Protein efficiency ration
Biological value (BV) of protein

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It is the radio between the amount of nitrogen retained and nitrogen
absorbed during a special interval.

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Retain nitrogen ? 100
BV= -----------------------------------------------
Absorbed nitrogen

Suppose 127mg of a particular protein was consumed by a rat in a

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day and 4mg is recoved in feces and 24mg is seen in urine. Then
Amount invested= 127mg
Amount absorbed= 127-4 = 123mg
Amount retained = 99/123?100= 81%
>Net protein utilization (NPU)

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NPU= retained nitrogen/intake of nitrogen?100 in the above example.
NPU of protein "A"=99/127?100= 78%
and for protein "B" it is 4.5/100?100=4.5%
Thus NPU is a better index than BV to denote nutritional quality and
availability of protein ( table 36.12)

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>Net dietary protein value (NDPV)
This will assess both quality and quality of the protein in diets.
NDPV= Intake of N?6.25? NPU
> Protein Efficiency Ratio or PER

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It is the weight gain per gram of protein take. The essential amino
acid content can also be expressed in terms of chemical score ( mg
of amino acid per gram of protein). By comparing the chemical
score of different proteins with egg protein, the essential amino acid

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content can be assessed.


02

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Presented by Prerna Singh
Roll no:- 107 or
Batch:- 19-20 (NMCH).