Table 4.
Protein digestibility-corrected amino acid score (PDCAAS) of raw walnuts.
| AAS ratios | ||||||
|---|---|---|---|---|---|---|
| Reference scoring pattern mg/g protein requirement | Child | Older child, adolescent, adult | ||||
| Amino acid | Child (6 months to 3 years)a | Older child, adolescent, adultb(3–10 years) | N*5.30 | N*6.25 | N*5.30 | N*6.25 |
| Histidine | 20 | 16 | 1.09 | 0.92 | 1.36 | 1.15 |
| Isoleucine | 32 | 30 | 1.38 | 1.17 | 1.47 | 1.24 |
| Leucine | 66 | 61 | 1.21 | 1.02 | 1.30 | 1.11 |
| Lysine | 57 | 48 | 0.53 | 0.45 | 0.63 | 0.54 |
| Sulfur Amino Acids (Met + Cys) | 27 | 23 | 12.34 | 10.46 | 14.49 | 12.28 |
| Aromatic AA (Phe, Tyr, Trp) | 52 | 41 | 1.88 | 1.59 | 2.38 | 2.02 |
| Threonine | 31 | 25 | 1.21 | 1.03 | 1.50 | 1.27 |
| Tryptophan | 8.5 | 7 | 1.26 | 1.07 | 1.62 | 1.37 |
| Valine | 43 | 40 | 1.14 | 0.97 | 1.23 | 1.04 |
| Population | Protein conversion | AAS | PDCAAS | |||
| Child | N*5.30 | 0.53 | 46% | |||
| N*6.25 | 0.45 | 39% | ||||
| Older child, adolescent, adult | N*5.30 | 0.63 | 55% | |||
| N*6.25 | 0.54 | 46% | ||||
a, b
Scoring patterns for the child and older child, adolescent, and adult groups were taken from Table 5 of the 2013 FAO Expert Consultation on Protein Quality Evaluation in Human Nutrition. Bolded numbers indicate the AAS ratios used in the estimation of PDCAAS.
PDCAAS, protein digestibility corrected amino acid score; AAS, amino acid score; N, nitrogen; Met, methionine; Cys, cystine; Phe, phenylalanine; Tyr, tyrosine; Trp, tryptophan.