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Shifted excitation Raman difference spectroscopy as enabling technique for the analysis of animal feedstuff

K. Sowoidnich1, M. Oster2, K. Wimmers2, M. Maiwald1, B. Sumpf1

Published in:

J. Raman Spectrosc., vol. 52, no. 8, pp. 1418-1427 (2021).

Abstract:

To achieve the best performance and health in farm animals, high-quality pellets should be applied for feeding. Raw materials used for pellet production can have a significant influence on the nutritive and physical characteristics of the final product. A comprehensive quality control of raw materials and pellets is therefore essential. Optical inspection techniques show great promise as they enable fast, simple, and non-destructive analysis. This study demonstrates the potential of shifted excitation Raman difference spectroscopy (SERDS) for inspection of intact feed pellets and their constituents. SERDS combines the ability of conventional Raman spectroscopy to obtain chemically specific information from the sample with efficient fluorescence background rejection capabilities. The latter is an essential prerequisite for the application to highly fluorescent natural samples, for example, feedstuffs. A custom dual-wavelength diode laser with two slightly shifted emission wavelengths (785.2 and 784.6 nm) as required for SERDS is used as excitation light source. Results demonstrate that Raman signals can efficiently be separated from unwanted background contributions allowing for qualitative spatially resolved analysis of chicken feed pellets. Individual constituents present at levels down to 10 g/kg were successfully detected by means of their characteristic spectral signature. This highlights the large potential of SERDS and could pave the way for future inspection of raw materials and pellets at selected points along the process chain.

1 Ferdinand-Braun-Institut gGmbH, Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany
2 Leibniz-Institut für Nutztierbiologie (FBN), Institut für Genombiologie, Abteilung Genomik, Dummerstorf, Germany

Keywords:

dual-wavelength diode laser, feed quality control, fluorescence rejection, non-destructive analysis, shifted excitation Raman difference spectroscopy

Copyright © 2021 The Authors. Journal of Raman Spectroscopy published by John Wiley & Sons Ltd.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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