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. 2014 Jan 24;14(2):2028-35.
doi: 10.3390/s140202028.

Detection of virgin olive oil adulteration using low field unilateral NMR

Zheng Xu  1 , Robert H Morris  2 , Martin Bencsik  3 , Michael I Newton  4
Affiliations

Detection of virgin olive oil adulteration using low field unilateral NMR

Zheng Xu et al. Sensors (Basel). .

Abstract

The detection of adulteration in edible oils is a concern in the food industry, especially for the higher priced virgin olive oils. This article presents a low field unilateral nuclear magnetic resonance (NMR) method for the detection of the adulteration of virgin olive oil that can be performed through sealed bottles providing a non-destructive screening technique. Adulterations of an extra virgin olive oil with different percentages of sunflower oil and red palm oil were measured with a commercial unilateral instrument, the profile NMR-Mouse. The NMR signal was processed using a 2-dimensional Inverse Laplace transformation to analyze the transverse relaxation and self-diffusion behaviors of different oils. The obtained results demonstrated the feasibility of detecting adulterations of olive oil with percentages of at least 10% of sunflower and red palm oils.

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Figures

Figure 1.
Figure 1.
Schematic diagram of the NMR MOUSE with the sample and the selective slice shown.
Figure 2.
Figure 2.
SGSE sequence composed of a Hahn echo and a CPMG sequence.
Figure 3.
Figure 3.
Superimposition of D-T2 distributions of sunflower and extra virgin olive mixed oils. From top to bottom, the peaks correspond to pure extra virgin olive oil, 10% sunflower oil, 20% sunflower oil and pure sunflower oil, respectively.
Figure 4.
Figure 4.
1D diffusion coefficient distribution of sunflower and extra virgin olive mixed oils.
Figure 5.
Figure 5.
D-T2 distribution of red palm and extra virgin olive oil mixtures. From top to bottom, they are pure red palm oil, 10% red palm oil, 20% red palm oil and pure extra virgin olive oil, respectively.
Figure 6.
Figure 6.
1d diffusion coefficient distribution of red palm and extra virgin olive mixed oils.
Figure 7.
Figure 7.
1d T2 distribution of red palm and extra virgin olive mixed oils.
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