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

Journal of Analytical Science and Technology

Table 5 Certification results for multivitamin tablet CRM 108-10-019

Compound	Units	Certified value^a	k	Relative standard deviation (%)^b
Thiamine	g/kg	23.38 ± 0.31	2.1	0.48
Riboflavin	g/kg	22.8 ± 1.7	2.1	2.2
Nicotinamide	g/kg	15.19 ± 0.44	2.1	0.93
Pantothenic acid	g/kg	25.09 ± 0.40	2.1	0.64
Pyridoxine	g/kg	21.62 ± 0.73	2.1	1.3
Biotin	mg/kg	25.65 ± 0.46	2.3	0.76
Folic acid	mg/kg	109.9 ± 6.0	2.2	2.2

^aThe number following “±” is the expanded uncertainty of the property value for the 95% level of confidence
^bThe relative standard deviation is based on measurement results among 10 or more units. This represents the homogeneity of each compound and is associated as one of the uncertainty factors of the certified values