Hinkov, B., Dabrowska, A., David, M., Schwaighofer, A., Freitag, S., Andrews, A. M., Strasser, G., & Lendl, B. (2023). Broadband mid-infrared milk protein analysis based on quantum cascade technology. In Razeghi Manijeh, Khodaparast Giti A., & Vitiello Miriam S. (Eds.), Quantum Sensing and Nano Electronics and Photonics XIX. SPIE. https://doi.org/10.1117/12.2650801
Quantum Sensing and Nano Electronics and Photonics XIX
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Volume:
PC12430
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Date (published):
17-Mar-2023
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Event name:
SPIE OPTO 2023
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Event date:
28-Jan-2023 - 3-Feb-2023
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Event place:
San Francisco, United States of America (the)
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Number of Pages:
1
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Publisher:
SPIE, Bellingham
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Keywords:
broadband; mid-infrared; milk protein analysis; quantum cascade
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Abstract:
Mid-infrared chemical sensors based on quantum cascade (QC) devices offer improved sensitivity, portability and costs compared to FTIR-based spectrometers. In this work, we combine for the first time a broadband external-cavity QC laser (EC-QCL) with a spectrally tailored QC detector (QCD) for broadband detection of bovine milk proteins including β-lactoglobulin, α-lactalbumin and casein. We analyze concentrations between 0.25-15 g/L in a 12.5-µm transmission flow cell in the amide-I and -II band (~1730-1470 cm-1) and obtain: a RMS noise-level of 0.067 mAU, a limit-of-detection of ~0.09 g/L, excellent agreement with FTIR absorbance-spectra and similar performance as much more bulky high-end FTIR-spectrometers.
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Research Areas:
Photonics: 50% Surfaces and Interfaces: 20% Nanoelectronics: 30%