Table 5. Accuracy of retinol, β-carotene and tocopherols analyses

SRM1) Analytes Accuracy Recovery4) (%)
Certified value2) Analytical value3)
SRM 1869 Retinol (μg/100 g) 1,927.0±32.0 1,945.89±12.03 101.0
β-Carotene (μg/100 g) 105.0±26.0 96.79±2.80 92.2
α-Tocopherol (mg/100 g) 21.72±0.62 21.80±0.12 100.4
β-Tocopherol (mg/100 g) 0.42±0.07 0.47±0.02 110.4
γ-Tocopherol (mg/100 g) 9.94±0.51 10.19±0.00 102.5
δ-Tocopherol (mg/100 g) 3.25±0.29 3.01±0.07 92.7
SRM, standard reference material; SRM 1869, Infant/Adult Nutritional Formula Ⅱ(milk/whey/soy based).
The certified value for the contents of corresponding analytes in SRM provided by NIST.
The analytical value obtained in this study.
Recovery (%) = analytical value / certified value × 100.