Net protein utilization


Net protein utilization

The net protein utilization, or NPU, is the ratio of amino acid converted to proteins to the ratio of amino acids supplied. This figure is somewhat affected by the salvage of essential amino acids within the body, but is profoundly affected by the level of limiting amino acids within a foodstuff.

Experimentally, this value can be determined by determining dietary protein intake and then measuring nitrogen excretion. One formula for NPU is:

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 eggs or milk, rate as 1 on an NPU chart.

The Protein Digestibility Corrected Amino Acid Score is a more modern rating for determining protein quality.

See also

References

  • Suzanne Nelson et al. Ad Libitum. H20 NaC

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Protein efficiency ratio — (PER) is based on the weight gain of a test subject divided by its intake of a particular food protein during the test period.From 1919 until very recently, the PER had been a widely used method for evaluating the quality of protein in food.In… …   Wikipedia

  • Protein (nutrient) — This article is about protein as a nutrient. For protein as a class of molecule, see protein. For other uses, see bodybuilding supplement. Amino acids are the building blocks of protein. Proteins are polymer chains made of amino acids linked… …   Wikipedia

  • Protein in nutrition — Proteins are broken down in the stomach during digestion by enzymes known as proteases into smaller polypeptides to provide amino acids for the organism, including the essential amino acids that the organism cannot biosynthesize itself. Aside… …   Wikipedia

  • AMP-activated protein kinase — 5 AMP activated protein kinase or AMPK consists of three proteins (subunits) that together make a functional enzyme, conserved from yeast to humans, that plays a role in cellular energy homeostasis. It is expressed in a number of tissues,… …   Wikipedia

  • NPU — net protein utilization …   Medical dictionary

  • NPU — • net protein utilization …   Dictionary of medical acronyms & abbreviations

  • PDCAAS — Protein Digestibility Corrected Amino Acid Score (PDCAAS) is a method of evaluating the protein quality based on both the amino acid requirements of humans and their ability to digest it. The PDCAAS rating is a fairly recent evaluation method; it …   Wikipedia

  • Biological value — (BV) is a measure of the proportion of absorbed protein from a food which becomes incorporated into the proteins of the organism s body. It summarises how readily the broken down protein can be used in protein synthesis in the cells of the… …   Wikipedia

  • Essential amino acid — An essential amino acid or indispensable amino acid is an amino acid that cannot be synthesized de novo by the organism (usually referring to humans), and therefore must be supplied in the diet. Contents 1 Essentiality vs. conditional… …   Wikipedia

  • Proteína — Saltar a navegación, búsqueda Estructura tridimensional de la hemoglobina. La animación corresponde a la transición conformacional entre las formas oxigenada y desoxigenada. Las proteínas son macromoléculas formadas por cadenas lineales de… …   Wikipedia Español


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.