Table 7. Repeatability and reproducibility of different extraction methods for biotin analysis of infant formula

Sample	Extraction method		Biotin (μg/100 g)¹⁾
			Repeatability²⁾		Reproducibility³⁾
			Mean±SD	RSD (%)	Mean±SD	RSD (%)
In house quality control	Autoclave	Non-treated	31.924±0.572	1.793	32.265±0.180	0.556
In house quality control	Autoclave	Pepsin-assisted	31.957±1.029	3.222	31.394±1.161	3.698

All values are mean±SD (n=3).
Repeatability refers to the results of 5 independent determinations carried out on a sample by analysing 3 replicates of the sample on the same day.
Reproducibility refers to the results of 5 independent determinations carried out on a sample by analyzing 3 replicates of the sample at each day for 5 days.