True about NPU? (DNB Jan 09)
|A|| It gives idea about quantity of protein|
|B|| It is the ratio of total nitrogen retained by total n2 intake multiplied by 100|
|C||It is inferior to amino acid score as a measure of protein quality|
|D||None of the above|
Ref: Park, 22nd Edi, Pg : 563
Net protein utilization (NPU): It is a product of digestibility coefficient and biological value divided by 100. The NPU gives a more complete expression of protein quality than the amino acid score. It is a biological method that requires special laboratory facilities.
- NPU = (Nitrogen retained by the body / Nitrogen intake) X 100
- In calculating protein quality, 1 gram of protein is assumed to be equivalent to 6.25 g of N.
- The protein requirement varies with the NPU of dietary protein. If the NPU is low, the protein requirement is high and vice versa. The NPU of the protein of Indian diets varies between 50 and 80.