Detection of Cyanuric Acid and Melamine in Infant Formula Powders by Mid-FTIR Spectroscopy and Multivariate Analysis

Table 5

External validation data of the SIMCA model.

Samples	Specified material	Identified material	Result	Total distance ratio	Residual distance
1–5	Infant formula	Infant formula	Identified	0.42–0.92	0.63–1.38
1–5	Infant formula-melamine	Infant formula-melamine	Identified	0.68–0.90	0.91–1.20
1–5	Infant formula-cyanuric acid	Infant formula-cyanuric acid	Identified	0.67–0.86	0.89–1.14

material, the material indicated during validation. material, the material identified during validation. , the material identified or not as the specified material. distance ratio must be less than 1.0 for a sample to be classified. distance should be as low as possible.