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Photopyroelectric Detection of Vegetable Oils' Adulteration

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Abstract

Highly accurate photopyroelectric (PPE) investigation, in the thermal-wave-resonator-cavity configuration, was combined with gas chromatography (GC), in order to detect adulteration of flax oil by mixing with sunflower oil. It was found that the value of the thermal diffusivity for the investigated mixtures ranges from 8.07 × 108m2/s (pure sunflower oil) to 10.03 × 108m2/s (pure flax oil) and is directly correlated with the total amount of the polyunsaturated fatty acids from oils composition. The correlation between the PPE signal and the composition of unadulterated and adulterated vegetable oils confirms the data obtained previously on fresh and spoiled vegetable oils and suggests that the thermal diffusivity may be a suitable parameter to detect oils' quality and their early spoilage and adulteration.

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Acknowledgments

This work is supported by the Romanian Ministry of Education and Research through the National Research Programs 39N/2006 and CEEX 65/2006.

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Authors and Affiliations

  1. National R&D Institute for Isotopic and Molecular Technologies, Cluj-Napoca, No. 65-103 Donath Street, PO Box 700, 400293, Cluj-Napoca, Romania

    M. Streza & D. Dadarlat

  2. Faculty of Agricultural Sciences, University of Agricultural Sciences and Veterinary Medicine, No. 3-5 Manastur Street, 400372, Cluj-Napoca, Romania

    C. Socaciu, C. Bele & F. Dulf

  3. Faculty of Physics, Babes-Bolyai University, 400084, Cluj-Napoca, Romania

    V. Simon

Authors
  1. M. Streza
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  2. D. Dadarlat
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  3. C. Socaciu
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  4. C. Bele
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  5. F. Dulf
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  6. V. Simon
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Correspondence to M. Streza.

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Streza, M., Dadarlat, D., Socaciu, C. et al. Photopyroelectric Detection of Vegetable Oils' Adulteration. Food Biophysics 4, 147–150 (2009). https://doi.org/10.1007/s11483-009-9111-1

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  • DOI: https://doi.org/10.1007/s11483-009-9111-1

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