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The net protein utilization, or NPU, is the ratio of amino acid mass converted to proteins to the mass 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. It is used as a measure of "protein quality" for human nutritional purposes. 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 NPU is:

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  • Utilización neta de proteínas (es)
  • Net protein utilization (en)
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  • La utilización neta de proteínas (NPU, por sus siglas en inglés) es la proporción de aminoácidos convertidos en proteínas a la proporción de aminoácidos suministrados. Esta cifra se ve afectada de algún modo por el rescate de aminoácidos esenciales dentro del cuerpo, pero está profundamente afectada por el nivel de aminoácidos limitantes dentro de un producto alimenticio. Se utiliza como una medida de la "calidad de la proteína" para fines nutricionales humanos.​ Ciertos productos alimenticios, como los huevos o la leche, se clasifican como 1 en una tabla de la NPU. (es)
  • The net protein utilization, or NPU, is the ratio of amino acid mass converted to proteins to the mass 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. It is used as a measure of "protein quality" for human nutritional purposes. 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 NPU is: (en)
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  • La utilización neta de proteínas (NPU, por sus siglas en inglés) es la proporción de aminoácidos convertidos en proteínas a la proporción de aminoácidos suministrados. Esta cifra se ve afectada de algún modo por el rescate de aminoácidos esenciales dentro del cuerpo, pero está profundamente afectada por el nivel de aminoácidos limitantes dentro de un producto alimenticio. Se utiliza como una medida de la "calidad de la proteína" para fines nutricionales humanos.​ Como valor, la NPU puede variar de 0 a 1 (o 100), con un valor de 1 (o 100) que indica el 100% de utilización de nitrógeno en la dieta como proteína y un valor de 0, una indicación de que ninguno de los nitrógeno suministrados se convirtió a proteína. Ciertos productos alimenticios, como los huevos o la leche, se clasifican como 1 en una tabla de la NPU. Experimentalmente, este valor puede determinarse determinando la ingesta de proteínas en la dieta y luego midiendo la excreción de nitrógeno. Una fórmula para NPU es: El puntaje de aminoácidos corregido por la digestibilidad de las proteínas es una calificación más moderna para determinar la calidad de las proteínas. La mejor evaluación de la calidad de la proteína es por la puntuación de aminoácidos indispensable digestible que es superior a PDCAAS (es)
  • The net protein utilization, or NPU, is the ratio of amino acid mass converted to proteins to the mass 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. It is used as a measure of "protein quality" for human nutritional purposes. 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 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)} 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 to replace the current protein ranking standard, the Protein Digestibility Corrected Amino Acid Score (PDCAAS). The proposition is contested, however, due to conflicts of interest and lack of data. (en)
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