By Hong-Sik Hwang
This short offers a entire assessment of NMR spectroscopy, protecting strategies reminiscent of 1H, 13C, and 31P NMR, that are trustworthy instruments to figure out lipid oxidation point, to spot oxidation items, and to explain oxidation mechanism. The short exhibits that 1H NMR spectroscopy continuously demonstrates reliability, accuracy, comfort, and merits over traditional analytical tools in decision of the extent of oxidation of suitable for eating oil in the course of frying and garage via tracking alterations in numerous proton signs of oil, together with olefinic, bisallylic and allylic protons. this contemporary analytical process is proven inside this article for use to spot oxidation items, together with basic oxidation items akin to hydroperoxides and conjugated dienes and secondary items reminiscent of aldehydes, ketones, epoxides and their derivatives. by way of choosing intermediates and ultimate oxidation items, many oxidation mechanisms will be elucidated. a comparatively more recent process, the textual content demonstrates that 13C NMR and 31P NMR spectroscopy may also supply additional info at the molecular constitution of an oxidation product. Backgrounds, rules, and benefits over traditional tools, most modern advances, and destiny clients of those equipment are discussed.
Advances in NMR Spectroscopy for Lipid Oxidation review begins through masking a number of the mechanisms of lipid oxidation, together with quite a few how to be sure oxidation items. NMR spectroscopy is then coated, together with its purposes in meals. the subsequent part makes a speciality of 1H NMR Spectroscopy, together with its use for evaluate of lipid oxidation in the course of oil garage and frying. the next part specializes in 13C NMR spectroscopy, together with its use in picking out and settling on oxidation items and mechanisms. a last part makes a speciality of 31<
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Extra resources for Advances in NMR Spectroscopy for Lipid Oxidation Assessment
Therefore, high oleic oils are recognized as the most promising alternatives to hydrogenated oils containing trans fats and/or highly saturated fats and tropical oils rich in saturated fats. 9917). 9820). 09 protons) was too small. 36 protons) and showed relatively weak correlations with the conventional methods. 9844). 60 bisallylic protons). This study provides important information indicating that the signals to monitor the deterioration of oil should be carefully selected, depending on the oil used.
1007/ bf02535116 Gertz C (2000) Chemical and physical parameters as quality indicators of used frying fats. Eur J Lipid Sci Technol 102(8-9):566–572. J Agric Food Chem 58(10):6234–6245. 1021/jf1005337 Gouilleux B, Charrier B, Akoka S, Felpin FX, Rodriguez-Zubiri M, Giraudeau P (2016) Ultrafast 2D NMR on a benchtop spectrometer: applications and perspectives. Trends Anal Chem 83:65–75. 014 Gray JI (1978) Measurement of lipid oxidation: a review. J Am Oil Chem Soc 55(6):539–546. 1007/bf02668066 Guillen MD, Goicoechea E (2009) Oxidation of corn oil at room temperature: primary and secondary oxidation products and determination of their concentration in the oil liquid matrix from 1H nuclear magnetic resonance data.
In contrast, concentrations of (E)-2-alkenals, n-alkanals, and 4-oxoalkanals increased during the whole period of heating time (40 h). The NMR signals of hydroperoxide protons were not observed in this study and the peroxide value of the oil remained almost constant throughout the oil degradation process. Very similar trends in the formation of these aldehydes were also observed with linseed oil heated at 190 °C for 20 h (Guillén and Uriarte 2012a), extra virgin olive, sunflower, and virgin linseed oils (Guillén and Uriarte 2012c) during heating at a frying temperature (190 °C).