Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 26: Poster: Biomolecules

MO 26.6: Poster

Donnerstag, 11. März 2010, 16:00–18:30, Lichthof

Determination of Milk Fat Unsaturation Degree Using Raman Spectroscopy — •Pinkie J Eravuchira, Rasha Hassanein, Patrice Donfack, Bernd von der Kammer, and Arnulf Materny — Jacobs University Bremen, Germany

The knowledge of the composition of milk fat is of paramount importance both for the desired quality and the shelf-life of the final milk product. Specifically, the unsaturation level of milk is a good indication of its healthiness, where a higher unsaturation level also means a less stable product. A rapid in-line detection technique would be an ultimate development that would help the manufacturer to estimate the milk fat unsaturation level and consequently decide about additives in order to increase the shelf life of the final milk product. Traditional methods for determining the unsaturation level of milk fat require tedious chemical analyses. Raman spectroscopy is already being successfully applied for food quality control. Raman spectra of fat show characteristic fingerprints at 1265, 1300 and 1654 cm⁻¹ that are directly connected with the unsaturation degree in the carbonic chain of fat molecules. In our contribution, we apply Raman spectroscopy in combination with chemometric analysis as a rapid tool for the quantification of milk fat unsaturation level, and we compared our results with the standard “iodine value” detection method and find a good agreement. We therefore evaluate the potential of the Raman technique for the milk fat unsaturation level detection directly without the need for separating the fat from the milk, an aspect that would be convenient for in-line monitoring.