Multivariate calibrations can be created to provide a variety of compositional or processing characteristics
Figure 1. Fat at Dry Matter Basis Model. Fat (Dry matter basis) Fett id Trockenmasse – this cheese calibration model required 9 principle components to create a model with an RSQ of 0.991 and SECV of 0.591. The number of factors used for the model was very high for the number of samples in the model. This model was also evaluated using only 2 factors, the RSQ was 0.956 and SECV was 1.282 (ASD Inc., 2010)
ASD optical spectrometry instruments have the added value of being portable and with optimal signal-to-noise design for faster measurements, and wide spectral coverage of 350-2500 nm for a variety of chemical and properties detection possibilities. ASD offers different instrument configurations and many accessory options for a variety of set-up and sampling approaches for the most convenient and productive measurement scenarios.
ASD instruments are a practical solution for the determination of Dairy composition measurement and properties analysis opportunities.
Aernouts, B.; Polshin, E.; Lammertyn, J.; Saeys, W. (2011). Visible and near-infrared spectroscopic analysis of raw milk for cow health monitoring: Reflectance or transmittance? Journal of Dairy Science, 94: 5315-5329. doi: 10.3168/jds.2011-4354.
ASD Inc. (2010). Cheese Calibration Development using LabSpec 5000. Boulder, CO: Dan Shiley.
Burns, D.A., & Ciurczak, E.W. (2008). Use of NIRS in the Dairy Industry, In: Handbook of Near-Infrared Analysis (3rd ed.). Boca Raton, FL: Taylor & Francis Group, LLC.
Feten, G.; Skeie, S.; AlmØy, T.; Østlie, H.; Isaksson, T. (2007). Using NIR spectroscopy for the prediction of free amino acids during cheese ripening. NIR News, 18(1): 4-5. doi:10.1016/j.idairyj.2005.03.008.
Tsenkova, R.; Atanassova, S.; Toyoda, K.; Ozaki, Y.; Itoh, K.; Fearn, T. (1999). Near-Infrared Spectroscopy for Dairy Management: Measurement of Unhomogenized Milk Composition. Journal of Dairy Science, 82(11): 2344-51. doi:10.3168/jds.S0022-0302(99)75484-6.
Wu, D.; He, Y.; Feng, S. (2008). Short-wave near-infrared spectroscopy analysis of major compounds in milk powder and wavelength assignment. Analytica chimica acta, 610(2): 232-42. doi: 10.1016/j.aca.2008.01.056.