Table A8.
Trueness of xanthophyll carotenoid quantification.
| Compound | NIST Concentration (μmol/L) | |
|---|---|---|
| Level 1 (NIST Consensus Values) |
Level 2 (NIST Consensus Values) |
|
| Total lutein | 0.035 (0.036 ± 0.010) | 0.075 (0.087 ± 0.037) |
| Total lutein + zeaxanthin | 0.053 (0.052 ± 0.006) | 0.106 (0.115 ± 0.019) |
| β-cryptoxanthin | 0.030 (0.030 ± 0.008) | 0.038 (0.044 ± 0.017) |
| α-tocopherol | 4.114 (5.15 ± 0.21) | 11.508 (11.85 ± 0.73) |
NIST: National Institute of Standards and Technology. Experimental vs. Consensus values (in brackets) equated to the mean of the value of the compound ± expanded uncertainty (U95%).