Which of the following statement is true about net protein utilization? (DNB Dec 09)
|A||It is the ratio of total nitrogen retained by total nitrogen intake multiplied by 100|
|B||It is marker of quantity of protein|
|C||It is the amount of one amino acid per gram of a protein divided by the amount of same amino acid per gram of egg protein.|
|D||If the NPU is high, the amount of protein requirement in diet is high|
NPU: It is the ratio of total nitrogen retained by total n2 intake multiplied by 100
Some facts about NPU:
1. It is measure of protein quality & is a product of digestibility coefficient & biological value divided by 100. It gives more complete expression of protein quality than the amino acid score.
2. It is a biological method & requires special laboratory facilities. The protein requirement varies with the NPU of dietary protein. If NPU is low, more protein is required & vice versa.
3. The NPU of protein of Indian diet varies between 50 – 80.