Rapid and Non-Invasive Determination of Iodine Value by Magnetic Resonance Relaxometry in Commercial Edible Oils.

Remiro, Víctor; Romero-de-Ávila, María Dolores; Segura, José; Cambero, María Isabel; Fernández-Valle, María Encarnación; Castejón, David

Featured Application: Rapid and Non-Invasive Determination of Iodine Value in Commercial Edible Oils. This study presents a fast, non-invasive method to determine the iodine value (IV) of edible oils using Time Domain Nuclear Magnetic Resonance (TD-NMR) and Magnetic Resonance Imaging (MRI) techniques. The IV, which quantifies the degree of unsaturation in fats and oils, is a key parameter in assessing oil quality and detecting potential adulteration. Different edible oils were used in this study (sunflower, soy, olive, sesame, and linseed). Statistically significant regression models (R2 > 0.92) were established between the IV derived from NMR spectra and the longitudinal (T1) and transverse (T2) relaxation times of the oils, which were obtained from MRI and TD-NMR analyses. The regression models obtained allow for the prediction of the IV from the T1 and T2 relaxation times across a range that includes predominantly mono- and polyunsaturated edible vegetable oils. The TD-NMR approach stands out for its speed (<2 min), lack of sample preparation (including direct analysis within the commercial packaging), and reproducibility, with a variability of only 0.62%. Meanwhile, the MRI technique allows for the simultaneous evaluation of multiple samples in a single acquisition. Together, these features make TD-NMR and MRI effective tools for the rapid and reliable analysis of the IV in edible oils.

EDIBLE fats & oils; NUCLEAR magnetic resonance; FATS & oils; MAGNETIC resonance imaging; MAGNETIC resonance

Applied Sciences (2076-3417), 2024, Vol 14, Issue 24, p11530

2076-3417

Academic Journal

10.3390/app142411530