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Detection of virgin olive oil adulteration using low field unilateral NMR
Zheng Xu1, Robert H Morris2, Martin Bencsik3
1State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, 174 Shazhengjie, Shapingba, Chongqing 400044, China. pinexz@163.com.
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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