Identification and Quantitation of Melamine in Milk by Near-Infrared Spectroscopy and Chemometrics

Figure 2

(a) The mean 1st-derivate NIR spectra of adulterated milk, pure milk, and melamine samples in the range of 4000–5880 cm⁻¹ and (b) the enlarged version in the range of 4230–4340 cm⁻¹.

(a)

(b)