The net protein utilization, or NPU, is the percentage of ingested nitrogen that is retained in the body. It is used to determine the nutritional efficiency of protein in the diet,[1]: 11 that is, it is used as a measure of "protein quality" for human nutritional purposes.[2]
As a value, NPU can range from 0 to 1 (or 100), with a value of 1 (or 100) 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 eggs or milk, rate as 1 on an NPU chart.
Experimentally, this value can be determined by determining dietary protein intake and then measuring nitrogen excretion. One formula for apparent NPU is:[3]
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)}
NPU and biological value (BV) both measure nitrogen retention; the difference is that biological value is calculated from nitrogen absorbed, whereas net protein utilization is from nitrogen ingested.[4] Another closely related quantity is the net postprandial protein utilization (NPPU), which is the maximum potential NPU of a dietary protein source under ideal conditions.[1]: 12
The Protein Digestibility Corrected Amino Acid Score (PDCAAS) is a more modern rating for determining protein quality, and the current ranking standard used by the FDA.
The Digestible Indispensable Amino Acid Score (DIAAS) is a protein quality method, proposed in March 2013 by the Food and Agriculture Organization[5] to replace the current protein ranking standard, the Protein Digestibility Corrected Amino Acid Score (PDCAAS). The proposition is contested, however, due to lack of data.[6]
^ ab"Scientific Opinion on Dietary Reference Values for protein: Dietary Reference Values for protein". EFSA Journal. 10 (2): 2557. February 2012. doi:10.2903/j.efsa.2012.2557. hdl:2434/257730. S2CID 139100064.
^Protein Quality–The 4 Most Important Metrics
^Blackburn, GL; Bistrian, BR; Maini, BS; Schlamm, HT; Smith, MF (1977). "Nutritional and metabolic assessment of the hospitalized patient". Journal of Parenteral and Enteral Nutrition. 1 (1): 11–22. doi:10.1177/014860717700100101. PMID 98649.
^Hoffman, JR; Falvo, MJ (September 2004). "Protein - Which is Best?". Journal of Sports Science & Medicine. 3 (3): 118–30. PMC 3905294. PMID 24482589.
^"FAO proposes new protein quality measurement - IFT.org". 2017-05-19. Archived from the original on 2017-05-19. Retrieved 2020-11-03.
^"Potential impact of the digestible indispensable amino acid score as a measure of protein quality on dietary regulations and health". ResearchGate. Retrieved 2020-11-03.
and 26 Related for: Net protein utilization information
absorbed, whereas netproteinutilization is from nitrogen ingested. Another closely related quantity is the net postprandial proteinutilization (NPPU), which...
the ratings of selected foods. (others) Amino acid score Protein quality Netproteinutilization Nitrogen balance Boutrif, E., Food Quality and Consumer...
retained to rebuild proteins. The amount of nitrogen retained divided by the total nitrogen intake is called netproteinutilization. The amount of nitrogen...
may refer to: Natural Product Updates, a journal in chemistry Netproteinutilization, the percentage of ingested nitrogen retained in the body NPU terminology...
true percentage utilization (usually shown with a percent symbol). The percentage utilization relative to a readily utilizableprotein source, often egg...
parasitic microorganisms. Protein (nutrient) Biological value NetproteinutilizationProtein efficiency ratio Protein digestibility Protein Digestibility Corrected...
acid score Protein Digestibility Corrected Amino Acid Score Protein quality Netproteinutilization Nitrogen balance "FAO proposes new protein quality measurement...
protein content which is independent from environmental conditions. White lupin seeds contain a high amount of protein. The netproteinutilization is...
Protein metabolism denotes the various biochemical processes responsible for the synthesis of proteins and amino acids (anabolism), and the breakdown of...
detecting the proteins, this technique is also utilized to visualize, distinguish, and quantify the different proteins in a complicated protein combination...
the protein and non-protein parts of the mixture, and finally separate the desired protein from all other proteins. Ideally, to study a protein of interest...
Keratin (/ˈkɛrətɪn/) is one of a family of structural fibrous proteins also known as scleroproteins. Alpha-keratin (α-keratin) is a type of keratin found...
Protein acetylation (and deacetylation) are acetylation reactions that occur within living cells as drug metabolism, by enzymes in the liver and other...
methionine sulfoxidation sites and its functional roles in proteins Healthcare Cost and Utilization Project (HCUP) is the largest collection of hospital care...
In computational biology, de novo protein structure prediction refers to an algorithmic process by which protein tertiary structure is predicted from its...
however, the protein's overall charge will decrease until the protein reaches the pH region that corresponds to its pI. At this point it has no net charge and...
the binding of E1 to the viral origin of replication. E2 also utilizes a cellular protein known as Bromodomain-4 (Brd4) to tether the viral genome to cellular...
by far the most important are the 22 α-amino acids incorporated into proteins. Only these 22 appear in the genetic code of life. Amino acids can be classified...
surface penetration occurring. The adsorption of larger biomolecules such as proteins is of high physiological relevance, and as such they adsorb with different...
The Hartig net is the network of inward-growing hyphae, that extends into the plant host root, penetrating between plant cells in the root epidermis and...
Myristoylation allows for weak protein–protein and protein–lipid interactions and plays an essential role in membrane targeting, protein–protein interactions and functions...
citalopram (an SSRI) or desipramine (an inhibitor of norepinephrine reuptake protein, NET). By examining the dose-response curves (using a normal medium as control)...
net charges of the protein molecules are neutralized, attractive hydrophobic interactions dominate over repulsive electrostatic charges, and protein aggregates...