FT-IR spectrometry was used to determine the water content of milk. Transmission spectra were taken with a 40-μm capillary cell. Calibration was performed in the mid-infrared on a specific water band at 2110 cm−1 and a reference region at 2590 cm−1. Multiple linear regression resulted in a prediction error of 0.14% water for milk samples having a water content between 84.9 and 88.0 w/w %.
MartelR.PaquinP.BuijsH., J. Dairy Sci.74, 2074 (1991).
3.
CoweI. A.McNicolJ. W., Appl. Spectrosc.39, 257 (1985).
4.
LahnerB. S., Fourier Transform Infrared Spectroscopy and Multidimensional Analysis of Spectral Data. New Chemometric Tools to the Quantification and Process Monitoring for Milk and Dairy Products, Thesis, University of Bourgogne, France (1991).
Van de VoortF. R.LaureanoM.SmithJ. P., J. Assoc. Off. Anal. Chem.71, 1024 (1988).
7.
IDF Standard 21B, Milk, Cream and Evaporated Milk. Determination of Total Solids Content (Reference Method) (International Dairy Federation, Brussels, Belgium, 1987).
8.
GurnettB.WilliamsD., “Structure of Water and Aqueous Solutions,” in Proceedings of the International Symposium, LuckW. A. P. Ed. (Verlag Chemie/Physik Verlag, Weinheim, Germany, 1974), Chap. III, p. 206.
