Dietary Protein Quality Measurements

Question 1

Overview

Answer 1

Protein Digestibility-Corrected Amino Acid Score (PDCAAS)
Biologic Value (BV)
Net Protein Utiliation (NPU)
Protein efficiency ratio (PER)

Question 2

PDCAA

Answer 2

Protein digestibility corrected amino acid score
FDA standard
Based on profile of essential amino acids
0 to 1, 1 with the highest quality

Question 3

Expound on PDCAAS

Answer 3

Animal sources
-generally has higher quality
-eggs, milk - value of 1
Plant sources
- soybean: value of 1

Question 4

Biologic value

Answer 4

Measures protein quality by calculatiotn the NITROGEN used for tissue formation divided by the nitrogen ABSORBED from food

Question 5

NET PROTEIN UTILIZATION

Answer 5

Measures protein quality by calculatiotn the NITROGEN used for tissue formation divided by the nitrogen INGESTED
*”clinically measured by determining dietary protein intake and then measuring dietary excretion”

Question 6

Protein efficiency ratio

Answer 6

Determines the efficiency of a protein through the measurement of ANIMAL GROWTH (rats)
The computed value is compared to a standard value of 2.7 (standard value of casein protein)
2.7 or more: excellent protein source
<2.7: poor protein source

Question 7

Nitrogen and protein

Answer 7

1g nitrogen = 6.25g protein