Calibration models for multi-component quantitative analyses of dairy with the use of two different types of portable near infrared spectrometer

Several partial Least squares (PLS) calibration models were performed on spectra of standards of restored milk measured with two different types of near infrared spectrophotometers [800-1080 nm]; the most reliable instrument was chosen using a self-made PLS program, ISCAP, the efficiency of which was evaluated with the Quant2 OPUS program. Then ISCAP was applied to develop and test a method of moisture prediction in milk powder based on diffuse reflection spectra received in a NIR spectrometer (1100-1700 nm) equipped with a remote fibre-optic probe The reference moisture was determined by thermo-gravimetric analysis.