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→top: It is used as a measure of "protein quality" for human nutritional purposes.<ref |
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The '''net protein utilization''', or NPU, is the ratio of [[amino acid]] converted to [[protein]]s to the ratio of amino acids supplied. This figure is somewhat affected by the salvage of [[essential amino acid]]s within the body, but is profoundly affected by the level of [[essential amino acid|limiting amino acids]] within a foodstuff.
It is used as a measure of "protein quality" for human nutritional purposes.<ref>[https://labdoor.com/article/protein-quality-the-4-most-important-metrics PROTEIN QUALITY–THE 4 MOST IMPORTANT METRICS]</ref>
Experimentally, this value can be determined by determining [[diet (nutrition)|diet]]ary protein intake and then measuring [[nitrogen]] [[excretion]]. One formula for NPU is:▼
As a value, NPU can range from
:NPU = ((0.16 × (24 hour protein intake in grams)) - ((24 hour urinary [[urea]] nitrogen) + 2) - (0.1 × ([[ideal body weight]] in kilograms))) / (0.16 × (24 hour protein intake in grams))▼
▲As a value, NPU can range from 1 to 0, with a value of 1 indicating 100% utilization of dietary nitrogen as protein and a value of 0 an indication that none of the nitrogen supplied was converted to protein.
Certain foodstuffs, such as [[Egg (food)|egg]]s or [[milk]], rate as 1 on an NPU chart.
▲Experimentally, this value can be determined by determining [[diet (nutrition)|diet]]ary protein intake and then measuring [[nitrogen]] [[excretion]]. One formula for NPU is:{{cn|date=Nov 9 2017}}
▲:NPU = ((0.16 × (24 hour protein intake in grams)) - ((24 hour urinary [[urea]] nitrogen) + 2) - (0.1 × ([[ideal body weight]] in kilograms))) / (0.16 × (24 hour protein intake in grams))
The [[PDCAAS|Protein Digestibility Corrected Amino Acid Score]] is a more modern rating for determining protein quality.
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