The development and use of recombined milk samples has brought significant improvement in the overall analytical quality performance of mid-infrared devices for the determination of milk composition in dairy laboratories. The first paper in this Bulletin briefly reviews the history of the development of recombined milk samples and explains the principles behind their use. To enable easy implementation of recombined milk samples by laboratories, the process of preparation and any critical points are described, taking into account recent developments.
In recent years several new applications with infrared spectrometry have been developed and implemented in dairy laboratories. Some of these prediction equations are not directly related to a component present in the milk, but are the result of interrelation(s) with other known or unknown components marked by variations in mid infrared spectra. More strongly than in the past, this new approach requires spectral standardisation. The second paper in this Bulletin provides an overview of three different standardisation procedures.
Keywords: Raw milk analysis, Mid-infrared spectrometry, Recombined milk samples, Calibration, Analytical quality control