Development of a certified reference material for the analysis of vitamins in multivitamin tablets

Journal of Analytical Science and Technology

Table 6 Reference values for multivitamin tablet CRM 108-10-019

Compound	Units	Reference Value^a	Lab 1	Lab 2
Retinol (Vitamin A)^b	mg/kg	14.3 ± 2.6	13.3 ± 0.77	15.4 ± 1.39
α-Tocopherol (Vitamin E)^b	mg/kg	14.3 ± 3.4	17.2 ± 0.40	11.4 ± 0.39
Cholecalciferol (Vitamin D₃)^c	mg/kg	0.125 ± 0.003	0.104 ± 0.010	0.145 ± 0.006
Phylloquinone (Vitamin K₁)^b,c	mg/kg	16.7 ± 3.0	14.8 ± 1.4	18.57 ± 0.53

^aThe number following “±” is the expanded uncertainty of the property value at the 95% level of confidence (k = 2)
^bLC–FL
^cLC–UV